Age and Sex in San Mateo County, California (County)

Age Structure#1

Percentage in each age cohort per year of age.1 Gray areas represent percentile bands from the counties in California.
Scope: population of California, San Mateo County, and other counties in California
San Mateo County
California
Percentile:
0th - 100th
10th - 90th
20th - 80th
30th - 70th
40th - 60th
0.0%0.5%1.0%1.5%Count%85+80-8475-7970-7467-6965-6662-6460-6155-5950-5445-4940-4435-3930-3425-2922-24212018-1915-1710-145-90-416,25516.3k2.154%2.15%13,96014.0k1.850%1.85%19,27119.3k2.553%2.55%25,95126.0k3.438%3.44%19,51719.5k2.586%2.59%15,56515.6k2.062%2.06%25,71625.7k3.407%3.41%19,83319.8k2.628%2.63%51,79551.8k6.863%6.86%55,63255.6k7.371%7.37%54,85054.9k7.267%7.27%53,45053.5k7.082%7.08%56,50356.5k7.486%7.49%56,03756.0k7.425%7.42%51,16751.2k6.779%6.78%26,92726.9k3.568%3.57%7,8991.047%1.05%7,3170.969%0.97%14,66314.7k1.943%1.94%25,86525.9k3.427%3.43%43,81943.8k5.806%5.81%47,05347.1k6.234%6.23%45,70345.7k6.055%6.06%
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 California and San Mateo County
Female Male
California
San Mateo County
Shaded bar tips show excess over facing bar.
0.5%0.0%0.5%Count%Senior2Older Adult3Younger Adult4College5Children6-0.175791%-0.055173%-0.157885%-0.041886%-0.230964%0.23%0.175791%0.157885%0.175791%0.18%110,519111k14.643%14.6%-0.678176%-0.028354%-0.628107%-0.017115%-0.706530%0.71%0.678176%0.628107%0.678176%0.68%261,276261k34.618%34.6%-0.687934%-0.701647%-0.687934%0.69%0.687934%0.027353%0.701647%0.031578%0.715287%0.72%190,634191k25.258%25.3%-0.471813%-0.701652%-0.471813%0.47%0.471813%0.046075%0.701652%0.050982%0.517888%0.52%29,87929.9k3.959%3.96%-0.584684%-0.642652%-0.584684%0.58%0.584684%0.026322%0.642652%0.028379%0.611006%0.61%162,440162k21.522%21.5%
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 California and San Mateo County
Female Male
California
San Mateo County
Shaded bar tips show excess over facing bar.
0.5%0.0%0.5%Count%85+80-8475-7970-7467-6965-6662-6460-6155-5950-5445-4940-4435-3930-3425-2922-24212018-1915-1710-145-90-4-0.046241%-0.042125%-0.039047%-0.031647%-0.088366%0.09%0.046241%0.039047%0.046241%0.05%16,25516.3k2.154%2.15%-0.152554%-0.064816%-0.138544%-0.050257%-0.217371%0.22%0.152554%0.138544%0.152554%0.15%13,96014.0k1.850%1.85%-0.227493%-0.055674%-0.194002%-0.048276%-0.283167%0.28%0.227493%0.194002%0.227493%0.23%19,27119.3k2.553%2.55%-0.300074%-0.087526%-0.278404%-0.047771%-0.387600%0.39%0.300074%0.278404%0.300074%0.30%25,95126.0k3.438%3.44%-0.397925%-0.066115%-0.369729%-0.052880%-0.464040%0.46%0.397925%0.369729%0.397925%0.40%19,51719.5k2.586%2.59%-0.497120%-0.036900%-0.447596%-0.055693%-0.534019%0.53%0.497120%0.447596%0.497120%0.50%15,56515.6k2.062%2.06%-0.563544%-0.008656%-0.489719%-0.047683%-0.572200%0.57%0.563544%0.489719%0.563544%0.56%25,71625.7k3.407%3.41%-0.612456%-0.088970%-0.556695%-0.041019%-0.701426%0.70%0.612456%0.556695%0.612456%0.61%19,83319.8k2.628%2.63%-0.662340%-0.047831%-0.610297%-0.030760%-0.710171%0.71%0.662340%0.610297%0.662340%0.66%51,79551.8k6.863%6.86%-0.721300%-0.031587%-0.672672%-0.012121%-0.752887%0.75%0.721300%0.672672%0.721300%0.72%55,63255.6k7.371%7.37%-0.719763%-0.013938%-0.669774%-0.733702%0.73%0.719763%0.669774%0.001370%0.719763%0.72%54,85054.9k7.267%7.27%-0.704368%-0.007632%-0.668957%-0.711999%0.71%0.704368%0.668957%0.000957%0.704368%0.70%53,45053.5k7.082%7.08%-0.745785%-0.661266%-0.745785%0.75%0.745785%0.005697%0.661266%0.007922%0.751483%0.75%56,50356.5k7.486%7.49%-0.732774%-0.705425%-0.732774%0.73%0.732774%0.019371%0.705425%0.028957%0.752145%0.75%56,03756.0k7.425%7.42%-0.646494%-0.730940%-0.646494%0.65%0.646494%0.062882%0.730940%0.048142%0.709376%0.71%51,16751.2k6.779%6.78%-0.585847%-0.713830%-0.585847%0.59%0.585847%0.017533%0.713830%0.047764%0.603380%0.60%26,92726.9k3.568%3.57%-0.507057%-0.720108%-0.507057%0.51%0.507057%0.032461%0.720108%0.071664%0.539518%0.54%7,8991.047%1.05%-0.438424%-0.741386%-0.438424%0.44%0.438424%0.092614%0.741386%0.058263%0.531038%0.53%7,3170.969%0.97%-0.470886%-0.672557%-0.470886%0.47%0.470886%0.029613%0.672557%0.037001%0.500498%0.50%14,66314.7k1.943%1.94%-0.552900%-0.659372%-0.552900%0.55%0.552900%0.036524%0.659372%0.030790%0.589424%0.59%25,86525.9k3.427%3.43%-0.577915%-0.642360%-0.577915%0.58%0.577915%0.005326%0.642360%0.027891%0.583241%0.58%43,81943.8k5.806%5.81%-0.602426%-0.643238%-0.602426%0.60%0.602426%0.042001%0.643238%0.027157%0.644427%0.64%47,05347.1k6.234%6.23%-0.592781%-0.632325%-0.592781%0.59%0.592781%0.025518%0.632325%0.028642%0.618299%0.62%45,70345.7k6.055%6.06%
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 California and San Mateo County
More Females More Males
California
San Mateo County
80%60%40%20%0%20%M:FFM85+80-8475-7970-7467-6965-6662-6460-6155-5950-5445-4940-4435-3930-3425-2922-24212018-1915-1710-145-90-4-91.099570%-81.049811%-91.099570%91.1%0.5230.5265.647%65.6%34.353%34.4%-42.487407%-36.274956%-42.487407%42.5%0.7020.7058.761%58.8%41.239%41.2%-24.472918%-24.884451%-24.472918%24.5%0.8030.8055.451%55.5%44.549%44.5%-29.168138%-17.158978%-29.168138%29.2%0.7740.7756.364%56.4%43.636%43.6%-16.614872%-14.302341%-16.614872%16.6%0.8580.8653.835%53.8%46.165%46.2%-7.422708%-12.442599%-7.422708%7.4%0.9310.9351.789%51.8%48.211%48.2%-1.536050%-9.736728%-1.536050%1.5%0.9850.9850.381%50.4%49.619%49.6%-14.526771%-7.368277%-14.526771%14.5%0.8730.8753.386%53.4%46.614%46.6%-7.221444%-5.040236%-7.221444%7.2%0.9330.9351.742%51.7%48.258%48.3%-4.379133%-1.801966%-4.379133%4.4%0.9580.9651.071%51.1%48.929%48.9%-1.936529%-1.936529%1.9%0.204484%0.9810.9850.479%50.5%49.521%49.5%-1.083481%-1.083481%1.1%0.143012%0.9890.9950.269%50.3%49.731%49.7%0.763928%1.197933%0.763928%0.8%1.0081.0149.810%49.8%50.190%50.2%2.643474%4.104936%2.643474%2.6%1.0261.0349.348%49.3%50.652%50.7%9.726606%6.586347%9.726606%9.7%1.0971.1047.681%47.7%52.319%52.3%2.992838%6.691182%2.992838%3.0%1.0301.0349.263%49.3%50.737%50.7%6.401881%9.951788%6.401881%6.4%1.0641.0648.449%48.4%51.551%51.6%21.124207%7.858621%21.124207%21.1%1.2111.2145.223%45.2%54.777%54.8%6.288689%5.501565%6.288689%6.3%1.0631.0648.476%48.5%51.524%51.5%6.605959%4.669609%6.605959%6.6%1.0661.0748.401%48.4%51.599%51.6%0.921638%4.341943%0.921638%0.9%1.0091.0149.771%49.8%50.229%50.2%6.971936%4.221871%6.971936%7.0%1.0701.0748.316%48.3%51.684%51.7%4.304873%4.529655%4.304873%4.3%1.0431.0448.946%48.9%51.054%51.1%
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 San Mateo County

Children Age Cohorts by County Subdivision#5

Percentage of population aged 0 to 17 (%):
19.4%20.2%21.0%21.7%22.5%23.3%

College Age Cohorts by County Subdivision#6

Percentage of population aged 18 to 21 (%):
3.33%3.52%3.70%3.88%4.05%4.24%

20s Age Cohorts by County Subdivision#7

Percentage of population aged 22 to 29 (%):
7.5%8.3%9.1%9.9%10.7%11.5%

30s Age Cohorts by County Subdivision#8

Percentage of population aged 30 to 39 (%):
11.8%12.5%13.2%13.8%14.5%15.2%

40s Age Cohorts by County Subdivision#9

Percentage of population aged 40 to 49 (%):
13.70%13.93%14.16%14.39%14.62%14.86%

50s Age Cohorts by County Subdivision#10

Percentage of population aged 50 to 59 (%):
13.76%14.11%14.44%14.78%15.12%15.46%

60s Age Cohorts by County Subdivision#11

Percentage of population aged 60 to 69 (%):
9.8%11.1%12.3%13.6%14.8%16.1%

70s Age Cohorts by County Subdivision#12

Percentage of population aged 70 to 79 (%):
5.76%6.07%6.37%6.67%6.97%7.27%

80+ Age Cohorts by County Subdivision#13

Percentage of population aged 80 and older (%):
3.860%3.901%3.942%3.982%4.023%4.064%
Road Data ©OpenStreetMap

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Map of Age Cohorts by Tract in San Mateo County

Children Age Cohorts by Tract#14

Percentage of population aged 0 to 17 (%):
10.6%15.0%19.3%23.6%27.9%32.3%

College Age Cohorts by Tract#15

Percentage of population aged 18 to 21 (%):
0.4%2.4%4.3%6.3%8.2%10.2%

20s Age Cohorts by Tract#16

Percentage of population aged 22 to 29 (%):
1.1%5.2%9.3%13.4%17.5%21.7%

30s Age Cohorts by Tract#17

Percentage of population aged 30 to 39 (%):
3%9%14%19%25%31%

40s Age Cohorts by Tract#18

Percentage of population aged 40 to 49 (%):
7.4%10.1%12.7%15.4%18.0%20.7%

50s Age Cohorts by Tract#19

Percentage of population aged 50 to 59 (%):
7.3%10.7%14.0%17.3%20.6%23.9%

60s Age Cohorts by Tract#20

Percentage of population aged 60 to 69 (%):
4.0%7.2%10.5%13.7%16.9%20.2%

70s Age Cohorts by Tract#21

Percentage of population aged 70 to 79 (%):
1.9%4.0%6.0%8.0%10.0%12.0%

80+ Age Cohorts by Tract#22

Percentage of population aged 80 and older (%):
0.2%2.1%4.0%5.9%7.8%9.7%
Road Data ©OpenStreetMap

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Age Cohorts by Place in San Mateo County

There are 32 places in San Mateo County. This section compares all 32 of those to each other, San Mateo County, and other entities that contain or substantially overlap with San Mateo County.

Children by Place#23

Percentage of population aged 0 to 17 (%):
Scope: population of San Mateo County, selected places in San Mateo County, and entities that contain San Mateo County
0%10%20%30%40%Count#Loma MarPescaderoLaderaWest Menlo ParkW Menlo PkNorth Fair OaksN Fair OaksEast Palo AltoE Palo AltoMoss BeachHillsboroughMenlo ParkSan CarlosWestCaliforniaWoodsidePacificRedwood CityBurlingameUnited States of AmericaUnited StatesEmerald Lake HillsEmerald Lk HlsHighlands-Baywood ParkHighlands-Baywoo…BelmontAthertonSan Mateo CountySan MateoFoster CitySan MateoPacificaBrisbaneSan Francisco, Oakland, and Hayward Metro AreaSan FranciscoSouth San FranciscoS San FranciscoEl GranadaSan BrunoMillbraePortola ValleyPortola VlyHalf Moon BayDaly CityColmaMontaraBroadmoorLa Honda42.666667%42.666667%42.7%64141.250000%41.250000%41.3%429235.865258%35.865258%35.9%543330.313316%30.313316%30.3%1,161428.902536%28.902536%28.9%4,377528.760263%28.760263%28.8%8,442628.251484%28.251484%28.3%1,047726.308345%26.308345%26.3%2,976825.219845%25.219845%25.2%8,403923.827544%23.827544%23.8%7,0521023.760486%23.760486%23.8%17,834,66617.8M23.646283%23.646283%23.6%9,140,2839.14M23.344250%23.344250%23.3%1,2831123.336041%23.336041%23.3%12,102,10512.1M23.290756%23.290756%23.3%19,23719.2k1223.129026%23.129026%23.1%6,9661323.108006%23.108006%23.1%73,612,43873.6M23.091603%23.091603%23.1%1,0891422.576860%22.576860%22.6%9621522.557397%22.557397%22.6%6,0721622.323558%22.323558%22.3%1,5911721.522415%21.522415%21.5%162,440162k21.424455%21.424455%21.4%7,0631820.888441%20.888441%20.9%21,35321.4k1920.837195%20.837195%20.8%8,0942020.818739%20.818739%20.8%9512120.429183%20.429183%20.4%935,152935k20.086503%20.086503%20.1%13,37513.4k2219.879322%19.879322%19.9%1,2192319.667259%19.667259%19.7%8,4052419.416570%19.416570%19.4%4,3732518.901099%18.901099%18.9%8602618.174416%18.174416%18.2%2,2322717.353117%17.353117%17.4%18,31518.3k2817.272727%17.272727%17.3%2662916.027634%16.027634%16.0%4643015.216127%15.216127%15.2%785315.791506%5.791506%5.8%3032
Count number of children
# rank of place out of 32 by %

Age Cohorts by County Subdivision in San Mateo County

There are 3 county subdivisions in San Mateo County. This section compares all 3 of those to each other, San Mateo County, and other entities that contain or substantially overlap with San Mateo County.

Children by County Subdivision#32

Percentage of population aged 0 to 17 (%):
Scope: population of San Mateo County, selected county subdivisions in San Mateo County, and entities that contain San Mateo County
0%5%10%15%20%Count#WestCaliforniaPacificSan MateoUnited States of AmericaUnited StatesSan Mateo CountySan MateoSan Francisco, Oakland, and Hayward Metro AreaSan FranciscoHalf Moon BaySouth San FranciscoS San Francisco23.760486%23.760486%23.8%17,834,66617.8M23.646283%23.646283%23.6%9,140,2839.14M23.336041%23.336041%23.3%12,102,10512.1M23.297112%23.297112%23.3%94,14294.1k123.108006%23.108006%23.1%73,612,43873.6M21.522415%21.522415%21.5%162,440162k20.429183%20.429183%20.4%935,152935k20.247583%20.247583%20.2%6,199219.403573%19.403573%19.4%62,09962.1k3
Count number of children
# rank of county subdivision out of 3 by %

Age Cohorts by County in the San Francisco Area

There are 5 counties in the San Francisco Area. This section compares San Mateo County to all of the counties in the San Francisco Area and to those entities that contain or substantially overlap with San Mateo County.

Children by County#41

Percentage of population aged 0 to 17 (%):
Scope: population of San Mateo County, selected other counties in the San Francisco Area, and entities that contain San Mateo County
0%5%10%15%20%Count#WestCaliforniaContra Costa CountyContra CostaPacificUnited States of AmericaUnited StatesSan Mateo CountySan MateoAlameda CountyAlamedaMarin CountyMarinSan Francisco, Oakland, and Hayward Metro AreaSan FranciscoSan Francisco CountySan Francisco23.760486%23.760486%23.8%17,834,66617.8M23.646283%23.646283%23.6%9,140,2839.14M23.527315%23.527315%23.5%260,665261k123.336041%23.336041%23.3%12,102,10512.1M23.108006%23.108006%23.1%73,612,43873.6M21.522415%21.522415%21.5%162,440162k221.443331%21.443331%21.4%344,212344k320.514887%20.514887%20.5%53,20753.2k420.429183%20.429183%20.4%935,152935k13.481174%13.481174%13.5%114,628115k5
Count number of children
# rank of county out of 5 by %

Age Cohorts by County in California

There are 58 counties in California. This section compares San Mateo County to the 50 most populous counties in California and to those entities that contain or substantially overlap with San Mateo County. The least populous of the compared counties has a population of 21,361.

Children by County#50

Percentage of population aged 0 to 17 (%):
Scope: population of San Mateo County, selected other counties in California, and entities that contain San Mateo County
0%10%20%30%Count#Tulare CountyTulareMerced CountyMercedKern CountyKernFresno CountyFresnoImperial CountyImperialSan Joaquin CountySan JoaquinYuba CountyYubaMadera CountyMaderaColusa CountyColusaKings CountyKingsStanislaus CountyStanislausSan Bernardino CountySan BernardinoGlenn CountyGlennSan Benito CountySan BenitoMonterey CountyMontereyRiverside CountyRiversideSutter CountySutterSacramento CountySacramentoVentura CountyVenturaTehama CountyTehamaWestCaliforniaContra Costa CountyContra CostaPacificUnited States of AmericaUnited StatesSanta Clara CountySanta ClaraOrange CountyOrangeSolano CountySolanoPlacer CountyPlacerLos Angeles CountyLos AngelesSanta Barbara CountySanta BarbaraSan Diego CountySan DiegoNapa CountyNapaMendocino CountyMendocinoYolo CountyYoloShasta CountyShastaSan Mateo CountySan MateoAlameda CountyAlamedaDel Norte CountyDel NorteEl Dorado CountyEl DoradoSonoma CountySonomaMarin CountyMarinSan Francisco, Oakland, and Hayward Metro AreaSan FranciscoLake CountyLakeButte CountyButteSiskiyou CountySiskiyouSanta Cruz CountySanta CruzHumboldt CountyHumboldtSan Luis Obispo CountySan Luis ObispoCalaveras CountyCalaverasNevada CountyNevadaTuolumne CountyTuolumneLassen CountyLassenAmador CountyAmadorSan Francisco CountySan Francisco31.582885%31.582885%31.6%143,945144k130.114981%30.114981%30.1%79,80579.8k229.467014%29.467014%29.5%256,757257k328.888866%28.888866%28.9%278,246278k428.713082%28.713082%28.7%51,34151.3k527.910500%27.910500%27.9%199,521200k627.884759%27.884759%27.9%20,60620.6k727.817117%27.817117%27.8%42,66242.7k827.788961%27.788961%27.8%5,936927.506139%27.506139%27.5%41,33141.3k1027.435111%27.435111%27.4%145,560146k1127.363518%27.363518%27.4%576,482576k1227.066057%27.066057%27.1%7,5721327.058965%27.058965%27.1%15,70815.7k1426.473439%26.473439%26.5%113,889114k1526.401700%26.401700%26.4%613,547614k1626.392470%26.392470%26.4%25,18025.2k1724.396471%24.396471%24.4%360,897361k1824.216057%24.216057%24.2%204,168204k1924.056177%24.056177%24.1%15,15915.2k2023.760486%23.760486%23.8%17,834,66617.8M23.646283%23.646283%23.6%9,140,2839.14M23.527315%23.527315%23.5%260,665261k2123.336041%23.336041%23.3%12,102,10512.1M23.108006%23.108006%23.1%73,612,43873.6M23.087802%23.087802%23.1%435,218435k2223.024375%23.024375%23.0%721,172721k2323.007663%23.007663%23.0%98,84098.8k2422.975624%22.975624%23.0%85,14185.1k2522.837323%22.837323%22.8%2,296,7852.30M2622.501394%22.501394%22.5%98,87098.9k2722.366565%22.366565%22.4%727,664728k2821.908353%21.908353%21.9%30,85230.9k2921.786086%21.786086%21.8%19,04319.0k3021.678248%21.678248%21.7%45,45345.5k3121.660678%21.660678%21.7%38,82238.8k3221.522415%21.522415%21.5%162,440162k3321.443331%21.443331%21.4%344,212344k3421.192269%21.192269%21.2%5,8553520.986885%20.986885%21.0%38,40638.4k3620.626748%20.626748%20.6%102,675103k3720.514887%20.514887%20.5%53,20753.2k3820.429183%20.429183%20.4%935,152935k20.332106%20.332106%20.3%13,02813.0k3920.311153%20.311153%20.3%45,47245.5k4020.245947%20.245947%20.2%8,8414120.123943%20.123943%20.1%54,52254.5k4219.528488%19.528488%19.5%26,39926.4k4318.233099%18.233099%18.2%50,81250.8k4417.956103%17.956103%18.0%8,0424517.790124%17.790124%17.8%17,54817.5k4616.677187%16.677187%16.7%8,9834716.472061%16.472061%16.5%5,2624815.542570%15.542570%15.5%5,7454913.481174%13.481174%13.5%114,628115k50
Count number of children
# rank of county out of 50 by %

Age Cohorts by County in the United States

There are 3,142 counties in the United States. This section compares San Mateo County to the 50 most populous counties in the United States and to those entities that contain or substantially overlap with San Mateo 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 San Mateo County, selected other counties in the United States, and entities that contain San Mateo 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 CountyClarkWestFranklin CountyFranklinCaliforniaFairfield CountyFairfieldMontgomery CountyMontgomeryContra Costa CountyContra CostaKings CountyKingsPacificHillsborough 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 CountyCuyahogaSan Mateo CountySan MateoAlameda CountyAlamedaKing CountyKingMiami-Dade CountyMiami-DadeMiddlesex CountyMiddlesexQueens CountyQueensSan Francisco, Oakland, and Hayward Metro AreaSan FranciscoPalm 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%493,981494k1723.760486%23.760486%23.8%17,834,66617.8M23.668593%23.668593%23.7%291,625292k1823.646283%23.646283%23.6%9,140,2839.14M23.577077%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%608,369608k2223.336041%23.336041%23.3%12,102,10512.1M23.197227%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%271,499271k4221.522415%21.522415%21.5%162,440162k21.443331%21.443331%21.4%344,212344k4320.896492%20.896492%20.9%434,553435k4420.604500%20.604500%20.6%548,990549k4520.568254%20.568254%20.6%322,430322k4620.470812%20.470812%20.5%472,878473k4720.429183%20.429183%20.4%935,152935k19.641010%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:
Redwood City, South San Francisco
Cities:
Belmont, Brisbane, Burlingame, Daly City, East Palo Alto, Foster City, Half Moon Bay, Menlo Park, Millbrae, Pacifica, Redwood City, San Bruno, San Carlos, San Mateo, South San Francisco
Towns:
Atherton, Colma, Hillsborough, Portola Valley, Woodside
Unincorporated Places:
Broadmoor, El Granada, Emerald Lake Hills, Highlands-Baywood Park, La Honda, Ladera, Loma Mar, Montara, Moss Beach, North Fair Oaks, Pescadero, West Menlo Park
ZIP Codes:
94002, 94005, 94010, 94014, 94015, 94019, 94020, 94021, 94025, 94027, 94028, 94030, 94037, 94038, 94044, 94060, 94061, 94062, 94063, 94065, 94066, 94070, 94074, 94080, 94128, 94303, 94401, 94402, 94403, 94404
Unified School Districts:
Cabrillo, La Honda-Pescadero, South San Francisco
Elementary School Districts:
Bayshore, Belmont-Redwood Shores, Brisbane, Burlingame, Hillsborough City, Jefferson, Las Lomitas, Menlo Park City, Millbrae, Pacifica, Portola Valley, Ravenswood City, Redwood City, San Bruno Park, San Carlos, San Mateo-Foster City, Woodside
Secondary School Districts:
Jefferson, San Mateo, Sequoia
Congressional Districts:
CA-14, CA-18
State Senate Districts:
CA-11, CA-13
Assembly Districts:
CA-19, CA-22, CA-24
Neighboring Counties:
Alameda, San Francisco, Santa Clara, Santa Cruz
Nearby Counties:
Contra Costa, Marin