Age and Sex in Middlesex County, Massachusetts (County)

Age Structure#1

Percentage in each age cohort per year of age.1 Gray areas represent percentile bands from the counties in Massachusetts.
Scope: population of Massachusetts, Middlesex County, and other counties in Massachusetts
Middlesex County
Massachusetts
Percentile:
0th - 100th
10th - 90th
20th - 80th
30th - 70th
40th - 60th
0.0%0.5%1.0%1.5%Count%85+80-8475-7970-7467-6965-6662-6460-6155-5950-5445-4940-4435-3930-3425-2922-24212018-1915-1710-145-90-432,93632.9k2.101%2.10%29,47829.5k1.880%1.88%37,24037.2k2.376%2.38%49,23649.2k3.141%3.14%39,40139.4k2.513%2.51%31,74331.7k2.025%2.02%52,01652.0k3.318%3.32%38,12838.1k2.432%2.43%106,467106k6.792%6.79%117,019117k7.465%7.46%112,834113k7.198%7.20%108,303108k6.909%6.91%99,92099.9k6.374%6.37%116,461116k7.429%7.43%120,888121k7.712%7.71%65,67765.7k4.190%4.19%20,26020.3k1.292%1.29%21,05621.1k1.343%1.34%46,11746.1k2.942%2.94%56,66756.7k3.615%3.61%91,09291.1k5.811%5.81%87,08587.1k5.555%5.56%87,58687.6k5.587%5.59%
Count number of people in age cohort
% age cohort as a percentage of the total population
1normalized with respect to the number of years in each interval

Age and Sex#2

Percentage in each age cohort per year of age.1
Scope: population of Massachusetts and Middlesex County
Female Male
Massachusetts
Middlesex County
Shaded bar tips show excess over facing bar.
0.5%0.0%0.5%Count%Senior2Older Adult3Younger Adult4College5Children6-0.166513%-0.056870%-0.179173%-0.060528%-0.223383%0.22%0.166513%0.179173%0.166513%0.17%220,034220k14.036%14.0%-0.663083%-0.038374%-0.662237%-0.044052%-0.701458%0.70%0.663083%0.662237%0.663083%0.66%534,767535k34.114%34.1%-0.711150%-0.660381%-0.006144%-0.711150%0.71%0.711150%0.005727%0.660381%0.716877%0.72%402,946403k25.704%25.7%-0.683668%-0.766222%-0.017135%-0.683668%0.68%0.683668%0.027032%0.766222%0.710700%0.71%87,43387.4k5.577%5.58%-0.559730%-0.560616%-0.559730%0.56%0.559730%0.023220%0.560616%0.024588%0.582950%0.58%322,430322k20.568%20.6%
Count number of people in age cohort
% age cohort as a percentage of the total population
1normalized with respect to the number of years in each interval 265+ 340-64 422-39 518-21 60-17

Detailed Age and Sex#3

Percentage in each age cohort per year of age.1
Scope: population of Massachusetts and Middlesex County
Female Male
Massachusetts
Middlesex County
Shaded bar tips show excess over facing bar.
0.5%0.0%0.5%Count%85+80-8475-7970-7467-6965-6662-6460-6155-5950-5445-4940-4435-3930-3425-2922-24212018-1915-1710-145-90-4-0.043661%-0.043992%-0.046447%-0.050660%-0.087653%0.09%0.043661%0.046447%0.043661%0.04%32,93632.9k2.101%2.10%-0.146963%-0.082163%-0.156508%-0.083152%-0.229126%0.23%0.146963%0.156508%0.146963%0.15%29,47829.5k1.880%1.88%-0.207871%-0.059377%-0.213469%-0.064537%-0.267248%0.27%0.207871%0.213469%0.207871%0.21%37,24037.2k2.376%2.38%-0.288720%-0.050727%-0.316024%-0.068770%-0.339447%0.34%0.288720%0.316024%0.288720%0.29%49,23649.2k3.141%3.14%-0.372563%-0.092689%-0.419753%-0.055660%-0.465252%0.47%0.372563%0.419753%0.372563%0.37%39,40139.4k2.513%2.51%-0.480221%-0.052022%-0.508903%-0.059595%-0.532243%0.53%0.480221%0.508903%0.480221%0.48%31,74331.7k2.025%2.02%-0.514116%-0.077825%-0.557414%-0.061316%-0.591941%0.59%0.514116%0.557414%0.514116%0.51%52,01652.0k3.318%3.32%-0.599862%-0.016394%-0.618023%-0.051178%-0.616257%0.62%0.599862%0.618023%0.599862%0.60%38,12838.1k2.432%2.43%-0.658990%-0.040354%-0.676577%-0.048367%-0.699345%0.70%0.658990%0.676577%0.658990%0.66%106,467106k6.792%6.79%-0.729914%-0.033133%-0.731910%-0.039160%-0.763047%0.76%0.729914%0.731910%0.729914%0.73%117,019117k7.465%7.46%-0.703287%-0.032993%-0.689914%-0.038463%-0.736280%0.74%0.703287%0.689914%0.703287%0.70%112,834113k7.198%7.20%-0.674811%-0.032138%-0.631126%-0.037009%-0.706949%0.71%0.674811%0.631126%0.674811%0.67%108,303108k6.909%6.91%-0.636676%-0.584959%-0.018190%-0.636676%0.64%0.636676%0.001454%0.584959%0.638131%0.64%99,92099.9k6.374%6.37%-0.740694%-0.656156%-0.013040%-0.740694%0.74%0.740694%0.004453%0.656156%0.745147%0.75%116,461116k7.429%7.43%-0.768405%-0.710160%-0.001522%-0.768405%0.77%0.768405%0.005512%0.710160%0.773917%0.77%120,888121k7.712%7.71%-0.690605%-0.692436%-0.690605%0.69%0.690605%0.015331%0.692436%0.017724%0.705937%0.71%65,67765.7k4.190%4.19%-0.634086%-0.752120%-0.019044%-0.634086%0.63%0.634086%0.024241%0.752120%0.658327%0.66%20,26020.3k1.292%1.29%-0.648439%-0.776860%-0.012993%-0.648439%0.65%0.648439%0.046313%0.776860%0.694752%0.69%21,05621.1k1.343%1.34%-0.726073%-0.767953%-0.018251%-0.726073%0.73%0.726073%0.018787%0.767953%0.744860%0.74%46,11746.1k2.942%2.94%-0.586774%-0.606894%-0.586774%0.59%0.586774%0.031407%0.606894%0.030020%0.618181%0.62%56,66756.7k3.615%3.61%-0.574671%-0.579863%-0.574671%0.57%0.574671%0.012835%0.579863%0.030477%0.587506%0.59%91,09291.1k5.811%5.81%-0.539547%-0.546764%-0.539547%0.54%0.539547%0.031959%0.546764%0.016321%0.571507%0.57%87,08587.1k5.555%5.56%-0.548746%-0.527455%-0.548746%0.55%0.548746%0.019954%0.527455%0.023708%0.568700%0.57%87,58687.6k5.587%5.59%
Count number of people in age cohort
% age cohort as a percentage of the total population
1normalized with respect to the number of years in each interval

Detailed Sex Ratio#4

Percentage more males or females in selected age cohorts.
Scope: population of Massachusetts and Middlesex County
More Females More Males
Massachusetts
Middlesex County
100%50%0%M:FFM85+80-8475-7970-7467-6965-6662-6460-6155-5950-5445-4940-4435-3930-3425-2922-24212018-1915-1710-145-90-4-100.757922%-109.071132%-100.757922%100.8%0.4980.5066.751%66.8%33.249%33.2%-55.907631%-53.129265%-55.907631%55.9%0.6410.6460.923%60.9%39.077%39.1%-28.564414%-30.232623%-28.564414%28.6%0.7780.7856.249%56.2%43.751%43.8%-17.569598%-21.761128%-17.569598%17.6%0.8510.8554.038%54.0%45.962%46.0%-24.878717%-13.260150%-24.878717%24.9%0.8010.8055.532%55.5%44.468%44.5%-10.832891%-11.710530%-10.832891%10.8%0.9020.9052.569%52.6%47.431%47.4%-15.137729%-11.000044%-15.137729%15.1%0.8690.8753.518%53.5%46.482%46.5%-2.733025%-8.280935%-2.733025%2.7%0.9730.9750.674%50.7%49.326%49.3%-6.123674%-7.148839%-6.123674%6.1%0.9420.9451.485%51.5%48.515%48.5%-4.539337%-5.350340%-4.539337%4.5%0.9570.9651.110%51.1%48.890%48.9%-4.691242%-5.574976%-4.691242%4.7%0.9550.9651.146%51.1%48.854%48.9%-4.762535%-5.863967%-4.762535%4.8%0.9550.9551.163%51.2%48.837%48.8%-3.109628%0.228443%0.228443%0.2%1.0021.0049.943%49.9%50.057%50.1%-1.987387%0.601144%0.601144%0.6%1.0061.0149.850%49.9%50.150%50.1%-0.214286%0.717274%0.717274%0.7%1.0071.0149.821%49.8%50.179%50.2%2.219964%2.559709%2.219964%2.2%1.0221.0249.451%49.5%50.549%50.5%-2.532095%3.822938%3.822938%3.8%1.0381.0449.062%49.1%50.938%50.9%-1.672490%7.142154%7.142154%7.1%1.0711.0748.276%48.3%51.724%51.7%-2.376561%2.587419%2.587419%2.6%1.0261.0349.361%49.4%50.639%50.6%5.352419%4.946519%5.352419%5.4%1.0541.0548.697%48.7%51.303%51.3%2.233421%5.255888%2.233421%2.2%1.0221.0249.448%49.4%50.552%50.6%5.923386%2.985058%5.923386%5.9%1.0591.0648.562%48.6%51.438%51.4%3.636279%4.494711%3.636279%3.6%1.0361.0449.107%49.1%50.893%50.9%
M:F ratio of males to females in the age cohort
F females as a percentage of the age cohort
M males as a percentage of the age cohort

Map of Age Cohorts by County Subdivision in Middlesex County

Children Age Cohorts by County Subdivision#5

Percentage of population aged 0 to 17 (%):
11.8%15.4%18.9%22.5%26.0%29.6%

College Age Cohorts by County Subdivision#6

Percentage of population aged 18 to 21 (%):
1.9%4.2%6.5%8.8%11.1%13.4%

20s Age Cohorts by County Subdivision#7

Percentage of population aged 22 to 29 (%):
2.9%7.9%12.9%17.9%22.9%27.9%

30s Age Cohorts by County Subdivision#8

Percentage of population aged 30 to 39 (%):
4.2%7.6%11.0%14.4%17.7%21.2%

40s Age Cohorts by County Subdivision#9

Percentage of population aged 40 to 49 (%):
9.6%11.5%13.3%15.2%17.0%18.9%

50s Age Cohorts by County Subdivision#10

Percentage of population aged 50 to 59 (%):
8.0%11.0%14.0%16.9%19.9%22.9%

60s Age Cohorts by County Subdivision#11

Percentage of population aged 60 to 69 (%):
6.8%8.5%10.2%11.8%13.4%15.1%

70s Age Cohorts by County Subdivision#12

Percentage of population aged 70 to 79 (%):
2.9%4.0%5.1%6.2%7.3%8.5%

80+ Age Cohorts by County Subdivision#13

Percentage of population aged 80 and older (%):
1.5%2.5%3.5%4.5%5.5%6.6%
Road Data ©OpenStreetMap

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Map of Age Cohorts by Tract in Middlesex County

Children Age Cohorts by Tract#14

Percentage of population aged 0 to 17 (%):
2%11%20%29%38%48%

College Age Cohorts by Tract#15

Percentage of population aged 18 to 21 (%):
0%13%26%39%52%65%

20s Age Cohorts by Tract#16

Percentage of population aged 22 to 29 (%):
1%9%17%25%32%40%

30s Age Cohorts by Tract#17

Percentage of population aged 30 to 39 (%):
3%8%13%19%24%29%

40s Age Cohorts by Tract#18

Percentage of population aged 40 to 49 (%):
0.9%5.2%9.4%13.6%17.8%22.1%

50s Age Cohorts by Tract#19

Percentage of population aged 50 to 59 (%):
0.3%4.9%9.3%13.8%18.3%22.9%

60s Age Cohorts by Tract#20

Percentage of population aged 60 to 69 (%):
0.3%4.0%7.7%11.4%15.0%18.7%

70s Age Cohorts by Tract#21

Percentage of population aged 70 to 79 (%):
0.0%2.9%5.7%8.6%11.5%14.4%

80+ Age Cohorts by Tract#22

Percentage of population aged 80 and older (%):
0.0%2.8%5.6%8.5%11.3%14.2%
Road Data ©OpenStreetMap

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Age Cohorts by Place in Middlesex County

There are 37 places that are fully or partially contained within Middlesex County (36 fully and 1 partially). This section compares all 37 of those to each other, Middlesex County, and other entities that contain or substantially overlap with Middlesex County.

Children by Place#23

Percentage of population aged 0 to 17 (%):
Scope: population of Middlesex County, selected places in Middlesex County, and entities that contain Middlesex County
0%10%20%30%40%Count#Hanscom AFBTownsendWinchesterLexingtonEast PepperellE PepperellCochituateBelmontHopkintonReadingEverettUnited States of AmericaUnited StatesWilmingtonLowellPinehurstNewtonMarlboroughNortheastArlingtonGrotonMaynardMelrosePepperellBurlingtonMassachusettsNew EnglandBoston, Cambridge, and Newton Metro AreaBoston AreaMiddlesex CountyMiddlesexLittleton CommonLittleton CmnFraminghamWoburnHudsonWakefieldMaldenWest ConcordStonehamAyerWatertown TownShirleyMedfordWalthamSomervilleCambridgeDevens45.805455%45.805455%45.8%890129.582449%29.582449%29.6%418228.922680%28.922680%28.9%6,505326.074812%26.074812%26.1%8,588425.312330%25.312330%25.3%466525.273775%25.273775%25.3%1,754624.770104%24.770104%24.8%6,330724.552613%24.552613%24.6%686824.433111%24.433111%24.4%6,228923.568420%23.568420%23.6%10,52010.5k1023.108006%23.108006%23.1%73,612,43873.6M22.968683%22.968683%23.0%5,3541122.776711%22.776711%22.8%25,02525.0k1222.594752%22.594752%22.6%1,7051322.483780%22.483780%22.5%19,85719.9k1421.388292%21.388292%21.4%8,4581521.341491%21.341491%21.3%11,965,27112.0M21.311475%21.311475%21.3%9,4641621.238177%21.238177%21.2%2471721.062132%21.062132%21.1%2,2171821.038615%21.038615%21.0%5,8461920.935043%20.935043%20.9%5062020.834306%20.834306%20.8%5,3542120.624778%20.624778%20.6%1,390,5521.39M20.620396%20.620396%20.6%3,024,7813.02M20.611211%20.611211%20.6%974,672975k20.568254%20.568254%20.6%322,430322k20.486342%20.486342%20.5%6152220.256421%20.256421%20.3%14,33014.3k2319.538501%19.538501%19.5%7,6632419.448599%19.448599%19.4%2,9912519.402250%19.402250%19.4%5,1222618.627742%18.627742%18.6%11,31311.3k2718.092364%18.092364%18.1%1,3792817.525537%17.525537%17.5%3,8262916.741924%16.741924%16.7%4823016.739047%16.739047%16.7%5,6663115.282880%15.282880%15.3%2083214.916055%14.916055%14.9%8,5293313.933237%13.933237%13.9%8,7363412.050511%12.050511%12.1%9,5813511.826365%11.826365%11.8%12,86212.9k364.455725%4.455725%4.5%7937
Count number of children
# rank of place out of 37 by %

Age Cohorts by County Subdivision in Middlesex County

There are 54 county subdivisions in Middlesex County. This section compares the 50 most populous of those to each other, Middlesex County, and other entities that contain or substantially overlap with Middlesex County. The least populous of the compared county subdivisions has a population of 5,287.

Children by County Subdivision#32

Percentage of population aged 0 to 17 (%):
Scope: population of Middlesex County, selected county subdivisions in Middlesex County, and entities that contain Middlesex County
0%10%20%Count#Town of SudburySudburyTown of WestonWestonTown of LincolnLincolnTown of WinchesterWinchesterTown of HopkintonHopkintonTown of WestfordWestfordTown of StowTown of WaylandWaylandTown of HollistonHollistonTown of LexingtonLexingtonTown of ActonTown of PepperellPepperellTown of BedfordBedfordTown of BelmontBelmontTown of ReadingReadingTown of NatickNatickTown of GrotonGrotonTown of TownsendTownsendEverettTown of ConcordConcordTown of BoxboroughBoxboroughUnited States of AmericaUnited StatesTown of WilmingtonWilmingtonTown of AshlandAshlandLowellTown of DracutDracutNewtonTown of North ReadingN ReadingTown of TyngsboroughTyngsboroughTown of LittletonLittletonMarlboroughNortheastTown of ArlingtonArlingtonTown of MaynardMaynardMelroseTown of ChelmsfordChelmsfordTown of BurlingtonBurlingtonMassachusettsNew EnglandBoston, Cambridge, and Newton Metro AreaBoston AreaMiddlesex CountyMiddlesexTown of HudsonHudsonTown of BillericaBillericaTown of FraminghamFraminghamTown of TewksburyTewksburyTown of AyerWoburnTown of WakefieldWakefieldMaldenTown of StonehamStonehamWatertown TownTown of ShirleyShirleyMedfordWalthamSomervilleCambridge29.563300%29.563300%29.6%5,497129.348736%29.348736%29.3%3,506229.213652%29.213652%29.2%1,943328.922680%28.922680%28.9%6,505428.701482%28.701482%28.7%4,666528.062893%28.062893%28.1%6,693626.910488%26.910488%26.9%1,891726.343768%26.343768%26.3%3,568826.291539%26.291539%26.3%3,766926.074812%26.074812%26.1%8,5881025.429790%25.429790%25.4%5,9021124.844153%24.844153%24.8%2,9891224.836740%24.836740%24.8%3,4991324.770104%24.770104%24.8%6,3301424.433111%24.433111%24.4%6,2281524.346474%24.346474%24.3%8,6151624.280093%24.280093%24.3%2,7151723.780553%23.780553%23.8%2,2281823.568420%23.568420%23.6%10,52010.5k1923.332647%23.332647%23.3%4,5342023.188954%23.188954%23.2%1,2262123.108006%23.108006%23.1%73,612,43873.6M22.968683%22.968683%23.0%5,3542222.853042%22.853042%22.9%3,9812322.776711%22.776711%22.8%25,02525.0k2422.630899%22.630899%22.6%7,0022522.483780%22.483780%22.5%19,85719.9k2622.311967%22.311967%22.3%3,4532721.783565%21.783565%21.8%2,6432821.398616%21.398616%21.4%2,0412921.388292%21.388292%21.4%8,4583021.341491%21.341491%21.3%11,965,27112.0M21.311475%21.311475%21.3%9,4643121.062132%21.062132%21.1%2,2173221.038615%21.038615%21.0%5,8463320.976336%20.976336%21.0%7,3223420.834306%20.834306%20.8%5,3543520.624778%20.624778%20.6%1,390,5521.39M20.620396%20.620396%20.6%3,024,7813.02M20.611211%20.611211%20.6%974,672975k20.568254%20.568254%20.6%322,430322k20.467480%20.467480%20.5%4,0283620.259070%20.259070%20.3%8,5553720.256421%20.256421%20.3%14,33014.3k3819.919020%19.919020%19.9%6,0513919.586329%19.586329%19.6%1,5534019.538501%19.538501%19.5%7,6634119.402250%19.402250%19.4%5,1224218.627742%18.627742%18.6%11,31311.3k4317.525537%17.525537%17.5%3,8264416.739047%16.739047%16.7%5,6664516.130768%16.130768%16.1%1,1994614.916055%14.916055%14.9%8,5294713.933237%13.933237%13.9%8,7364812.050511%12.050511%12.1%9,5814911.826365%11.826365%11.8%12,86212.9k50
Count number of children
# rank of county subdivision out of 50 by %

Age Cohorts by County in the Boston Area

There are 7 counties in the Boston Area. This section compares Middlesex County to all of the counties in the Boston Area and to those entities that contain or substantially overlap with Middlesex County.

Children by County#41

Percentage of population aged 0 to 17 (%):
Scope: population of Middlesex County, selected other counties in the Boston Area, and entities that contain Middlesex County
0%5%10%15%20%Count#United States of AmericaUnited StatesPlymouth CountyPlymouthEssex CountyEssexNorfolk CountyNorfolkNortheastRockingham CountyRockinghamMassachusettsNew EnglandBoston, Cambridge, and Newton Metro AreaBoston AreaMiddlesex CountyMiddlesexStrafford CountyStraffordSuffolk CountySuffolk23.108006%23.108006%23.1%73,612,43873.6M22.503982%22.503982%22.5%114,018114k122.027342%22.027342%22.0%169,470169k221.676664%21.676664%21.7%149,833150k321.341491%21.341491%21.3%11,965,27112.0M20.695487%20.695487%20.7%62,16262.2k420.624778%20.624778%20.6%1,390,5521.39M20.620396%20.620396%20.6%3,024,7813.02M20.611211%20.611211%20.6%974,672975k20.568254%20.568254%20.6%322,430322k519.436436%19.436436%19.4%24,47324.5k617.231044%17.231044%17.2%132,286132k7
Count number of children
# rank of county out of 7 by %

Age Cohorts by County in Massachusetts

There are 14 counties in Massachusetts. This section compares Middlesex County to all of the counties in Massachusetts and to those entities that contain or substantially overlap with Middlesex County.

Children by County#50

Percentage of population aged 0 to 17 (%):
Scope: population of Middlesex County, selected other counties in Massachusetts, and entities that contain Middlesex County
0%5%10%15%20%Count#United States of AmericaUnited StatesPlymouth CountyPlymouthHampden CountyHampdenWorcester CountyWorcesterEssex CountyEssexNorfolk CountyNorfolkNortheastBristol CountyBristolMassachusettsNew EnglandBoston, Cambridge, and Newton Metro AreaBoston AreaMiddlesex CountyMiddlesexNantucket CountyNantucketFranklin CountyFranklinDukes CountyDukesBerkshire CountyBerkshireSuffolk CountySuffolkBarnstable CountyBarnstableHampshire CountyHampshire23.108006%23.108006%23.1%73,612,43873.6M22.503982%22.503982%22.5%114,018114k122.460433%22.460433%22.5%105,131105k222.039629%22.039629%22.0%179,312179k322.027342%22.027342%22.0%169,470169k421.676664%21.676664%21.7%149,833150k521.341491%21.341491%21.3%11,965,27112.0M21.177109%21.177109%21.2%117,505118k620.624778%20.624778%20.6%1,390,5521.39M20.620396%20.620396%20.6%3,024,7813.02M20.611211%20.611211%20.6%974,672975k20.568254%20.568254%20.6%322,430322k719.945764%19.945764%19.9%2,133818.320266%18.320266%18.3%12,99213.0k918.171208%18.171208%18.2%3,1141017.955399%17.955399%18.0%23,08423.1k1117.231044%17.231044%17.2%132,286132k1215.949009%15.949009%15.9%34,24334.2k1315.525196%15.525196%15.5%25,00125.0k14
Count number of children
# rank of county out of 14 by %

Age Cohorts by County in the United States

There are 3,142 counties in the United States. This section compares Middlesex County to the 50 most populous counties in the United States and to those entities that contain or substantially overlap with Middlesex County. The least populous of the compared counties has a population of 941,618.

Children by County#59

Percentage of population aged 0 to 17 (%):
Scope: population of Middlesex County, selected other counties in the United States, and entities that contain Middlesex County
0%5%10%15%20%25%Count#Fresno CountyFresnoSalt Lake CountySalt LakeSan Bernardino CountySan BernardinoHarris CountyHarrisTarrant CountyTarrantDallas CountyDallasRiverside CountyRiversideBexar CountyBexarBronx CountyBronxMaricopa CountyMaricopaWake CountyWakeMecklenburg CountyMecklenburgMilwaukee CountyMilwaukeeSacramento CountySacramentoWayne CountyWayneFairfax CountyFairfaxClark CountyClarkFranklin CountyFranklinFairfield CountyFairfieldMontgomery CountyMontgomeryContra Costa CountyContra CostaKings CountyKingsHillsborough CountyHillsboroughUnited States of AmericaUnited StatesSanta Clara CountySanta ClaraTravis CountyTravisOrange CountyOrangeWestchester CountyWestchesterFulton CountyFultonLos Angeles CountyLos AngelesOrange CountyOrangeCook CountyCookSt. Louis CountySt. LouisSan Diego CountySan DiegoSuffolk CountySuffolkHennepin CountyHennepinPhiladelphia CountyPhiladelphiaNassau CountyNassauOakland CountyOaklandPima CountyPimaHonolulu CountyHonoluluBroward CountyBrowardCuyahoga CountyCuyahogaAlameda CountyAlamedaNortheastKing CountyKingMassachusettsNew EnglandBoston, Cambridge, and Newton Metro AreaBoston AreaMiami-Dade CountyMiami-DadeMiddlesex CountyMiddlesexQueens CountyQueensPalm Beach CountyPalm BeachAllegheny CountyAlleghenyNew York CountyNew York28.888866%28.888866%28.9%278,246278k128.329602%28.329602%28.3%309,506310k227.363518%27.363518%27.4%576,482576k327.228891%27.228891%27.2%1,207,3991.21M427.104397%27.104397%27.1%527,866528k526.929187%26.929187%26.9%676,745677k626.401700%26.401700%26.4%613,547614k726.219361%26.219361%26.2%487,339487k825.573137%25.573137%25.6%367,431367k925.043628%25.043628%25.0%1,023,9211.02M1024.990987%24.990987%25.0%249,554250k1124.574361%24.574361%24.6%248,637249k1224.468076%24.468076%24.5%233,745234k1324.396471%24.396471%24.4%360,897361k1424.179435%24.179435%24.2%427,394427k1523.983328%23.983328%24.0%271,704272k1623.862053%23.862053%23.9%493,981494k1723.668593%23.668593%23.7%291,625292k1823.577077%23.577077%23.6%222,006222k1923.549379%23.549379%23.5%241,704242k2023.527315%23.527315%23.5%260,665261k2123.337305%23.337305%23.3%608,369608k2223.197227%23.197227%23.2%306,913307k2323.108006%23.108006%23.1%73,612,43873.6M23.087802%23.087802%23.1%435,218435k2423.030006%23.030006%23.0%264,425264k2523.024375%23.024375%23.0%721,172721k2622.943185%22.943185%22.9%222,372222k2722.934276%22.934276%22.9%228,599229k2822.837323%22.837323%22.8%2,296,7852.30M2922.760229%22.760229%22.8%285,881286k3022.694997%22.694997%22.7%1,186,3981.19M3122.432138%22.432138%22.4%224,447224k3222.366565%22.366565%22.4%727,664728k3322.324565%22.324565%22.3%334,451334k3422.273612%22.273612%22.3%269,347269k3522.168125%22.168125%22.2%345,809346k3622.141419%22.141419%22.1%300,415300k3722.121412%22.121412%22.1%273,247273k3821.856045%21.856045%21.9%219,290219k3921.601744%21.601744%21.6%213,209213k4021.598472%21.598472%21.6%402,548403k4121.569623%21.569623%21.6%271,499271k4221.443331%21.443331%21.4%344,212344k4321.341491%21.341491%21.3%11,965,27112.0M20.896492%20.896492%20.9%434,553435k4420.624778%20.624778%20.6%1,390,5521.39M20.620396%20.620396%20.6%3,024,7813.02M20.611211%20.611211%20.6%974,672975k20.604500%20.604500%20.6%548,990549k4520.568254%20.568254%20.6%322,430322k4620.470812%20.470812%20.5%472,878473k4719.641010%19.641010%19.6%274,730275k4819.092867%19.092867%19.1%234,911235k4914.639548%14.639548%14.6%239,355239k50
Count number of children
# rank of county out of 50 by %

Definitions

The US Census reports extensively on the topics of age and sex, often reporting other topics broken down by age and sex cohorts. This page reports on age and sex alone; charts presenting other topics by age and sex can be found on their topic-specific pages.

  • Children: less than 18 years old
  • College: from 18 to 21 years old
  • 20s: from 22 to 29 years old, to not overlap the college category
  • Younger Adult: from 22 to 39 years old
  • Older Adult: from 40 to 64 years old
  • Senior: more than 64 years old

For additional information about the data presented on this site, including our sources, please see the About Page.

More Topics to Explore

Demographics

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More Maps to Explore

Principal Cities:
Cambridge, Newton, Waltham
Principal Unincorporated Place:
Framingham
Cities:
Cambridge, Everett, Lowell, Malden, Marlborough, Medford, Melrose, Newton, Somerville, Waltham, Watertown Town, Woburn
Towns:
Acton, Arlington, Ashby, Ashland, Ayer, Bedford, Belmont, Billerica, Boxborough, Burlington, Carlisle, Chelmsford, Concord, Dracut, Dunstable, Framingham, Groton, Holliston, Hopkinton, Hudson, Lexington, Lincoln, Littleton, Maynard, Natick, North Reading, Pepperell, Reading, Sherborn, Shirley, Stoneham, Stow, Sudbury, Tewksbury, Townsend, Tyngsborough, Wakefield, Wayland, Westford, Weston, Wilmington, Winchester
Unincorporated Places:
Arlington, Ayer, Belmont, Burlington, Cochituate, Devens, East Pepperell, Framingham, Groton, Hanscom AFB, Hopkinton, Hudson, Lexington, Littleton Common, Maynard, Pepperell, Pinehurst, Reading, Shirley, Stoneham, Townsend, Wakefield, West Concord, Wilmington, Winchester
ZIP Codes:
01431, 01432, 01434, 01450, 01460, 01463, 01464, 01469, 01474, 01503, 01701, 01702, 01718, 01719, 01720, 01721, 01730, 01731, 01740, 01741, 01742, 01746, 01748, 01749, 01752, 01754, 01760, 01770, 01773, 01775, 01776, 01778, 01801, 01803, 01810, 01821, 01824, 01826, 01827, 01850, 01851, 01852, 01854, 01862, 01863, 01864, 01867, 01876, 01879, 01880, 01886, 01887, 01890, 01906, 01940, 02129, 02138, 02139, 02140, 02141, 02142, 02143, 02144, 02145, 02148, 02149, 02150, 02155, 02176, 02180, 02420, 02421, 02451, 02452, 02453, 02458, 02459, 02460, 02461, 02462, 02464, 02465, 02466, 02467, 02468, 02472, 02474, 02476, 02478, 02493
Unified School Districts:
Acton-Boxborough, Arlington, Ashland, Ayer-Shirley, Bedford, Belmont, Billerica, Burlington, Cambridge, Chelmsford, Dracut, Everett, Framingham, Groton-Dunstable, Holliston, Hopkinton, Hudson, Lexington, Littleton, Lowell, Malden, Marlborough, Maynard, Medford, Melrose, Nashoba, Natick, Newton, North Middlesex, North Reading, Reading, Somerville, Stoneham, Tewksbury, Tyngsborough, Wakefield, Waltham, Watertown, Wayland, Westford, Weston, Wilmington, Winchester, Woburn
Elementary School Districts:
Carlisle, Concord, Lincoln, Sherborn, Sudbury
Secondary School Districts:
Concord-Carlisle, Dover-Sherborn, Lincoln-Sudbury
Congressional Districts:
MA-3, MA-4, MA-5, MA-6, MA-7
Upper State Legislative Districts:
MA-5th Middlesex, MA-1st Essex and Middlesex, MA-1st Middlesex and Norfolk, MA-1st Middlesex, MA-1st Suffolk and Middlesex, MA-4th Middlesex, MA-Middlesex and Suffolk, MA-Middlesex and Worcester, MA-Norfolk, Bristol and Middlesex, MA-2nd Essex and Middlesex, MA-2nd Middlesex and Norfolk, MA-2nd Middlesex, MA-2nd Suffolk and Middlesex, MA-3rd Middlesex, MA-Worcester and Middlesex, MA-Worcester, Hampden, Hampshire and Middlesex
Lower State Legislative Districts:
MA-1st Middlesex, MA-2nd Middlesex, MA-3rd Middlesex, MA-4th Middlesex, MA-5th Middlesex, MA-6th Middlesex, MA-7th Middlesex, MA-8th Middlesex, MA-8th Suffolk, MA-9th Essex, MA-9th Middlesex, MA-10th Middlesex, MA-11th Middlesex, MA-12th Middlesex, MA-13th Middlesex, MA-14th Middlesex, MA-14th Norfolk, MA-15th Middlesex, MA-16th Middlesex, MA-17th Middlesex, MA-18th Essex, MA-18th Middlesex, MA-19th Middlesex, MA-20th Middlesex, MA-21st Middlesex, MA-22nd Middlesex, MA-23rd Middlesex, MA-24th Middlesex, MA-25th Middlesex, MA-26th Middlesex, MA-27th Middlesex, MA-28th Middlesex, MA-29th Middlesex, MA-30th Middlesex, MA-31st Middlesex, MA-32nd Middlesex, MA-33rd Middlesex, MA-34th Middlesex, MA-35th Middlesex, MA-36th Middlesex, MA-37th Middlesex
Neighboring Counties:
Essex, Hillsborough, Norfolk, Suffolk, Worcester
Nearby Counties:
Bristol, Bristol, Cheshire, Kent, Merrimack, Plymouth, Providence, Rockingham, Strafford, Windham