Age and Sex in Contra Costa 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, Contra Costa County, and other counties in California
Contra Costa County
California
Percentile:
0th - 100th
10th - 90th
20th - 80th
30th - 70th
40th - 60th
0.0%0.5%1.0%1.5%Count%85+80-8475-7970-7467-6965-6662-6460-6155-5950-5445-4940-4435-3930-3425-2922-24212018-1915-1710-145-90-421,53621.5k1.944%1.94%18,98319.0k1.713%1.71%25,86425.9k2.334%2.33%37,43837.4k3.379%3.38%29,97330.0k2.705%2.71%23,56923.6k2.127%2.13%38,92638.9k3.513%3.51%27,07227.1k2.443%2.44%76,59776.6k6.914%6.91%83,69883.7k7.554%7.55%81,26881.3k7.335%7.34%76,36876.4k6.893%6.89%72,89872.9k6.580%6.58%71,26171.3k6.432%6.43%67,42967.4k6.086%6.09%41,14841.1k3.714%3.71%13,51313.5k1.220%1.22%13,24313.2k1.195%1.20%26,47626.5k2.390%2.39%46,07046.1k4.158%4.16%74,70574.7k6.743%6.74%74,59574.6k6.733%6.73%65,29565.3k5.893%5.89%
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 Contra Costa County
Female Male
California
Contra Costa County
Shaded bar tips show excess over facing bar.
0.5%0.0%0.5%Count%Senior2Older Adult3Younger Adult4College5Children6-0.172277%-0.049986%-0.157885%-0.041886%-0.222262%0.22%0.172277%0.157885%0.172277%0.17%157,363157k14.203%14.2%-0.670276%-0.045566%-0.628107%-0.017115%-0.715843%0.72%0.670276%0.628107%0.670276%0.67%383,929384k34.653%34.7%-0.628773%-0.009768%-0.701647%-0.638541%0.64%0.628773%0.701647%0.031578%0.628773%0.63%252,736253k22.812%22.8%-0.570030%-0.701652%-0.570030%0.57%0.570030%0.061105%0.701652%0.050982%0.631135%0.63%53,23253.2k4.805%4.80%-0.640462%-0.642652%-0.640462%0.64%0.640462%0.026150%0.642652%0.028379%0.666612%0.67%260,665261k23.527%23.5%
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 Contra Costa County
Female Male
California
Contra Costa County
Shaded bar tips show excess over facing bar.
0.5%0.0%0.5%Count%85+80-8475-7970-7467-6965-6662-6460-6155-5950-5445-4940-4435-3930-3425-2922-24212018-1915-1710-145-90-4-0.039838%-0.041812%-0.039047%-0.031647%-0.081650%0.08%0.039838%0.039047%0.039838%0.04%21,53621.5k1.944%1.94%-0.145912%-0.050852%-0.138544%-0.050257%-0.196764%0.20%0.145912%0.138544%0.145912%0.15%18,98319.0k1.713%1.71%-0.212343%-0.042205%-0.194002%-0.048276%-0.254548%0.25%0.212343%0.194002%0.212343%0.21%25,86425.9k2.334%2.33%-0.306627%-0.062567%-0.278404%-0.047771%-0.369195%0.37%0.306627%0.278404%0.306627%0.31%37,43837.4k3.379%3.38%-0.423434%-0.054907%-0.369729%-0.052880%-0.478342%0.48%0.423434%0.369729%0.423434%0.42%29,97330.0k2.705%2.71%-0.484915%-0.093824%-0.447596%-0.055693%-0.578740%0.58%0.484915%0.447596%0.484915%0.48%23,56923.6k2.127%2.13%-0.535626%-0.099886%-0.489719%-0.047683%-0.635512%0.64%0.535626%0.489719%0.535626%0.54%38,92638.9k3.513%3.51%-0.589390%-0.042963%-0.556695%-0.041019%-0.632353%0.63%0.589390%0.556695%0.589390%0.59%27,07227.1k2.443%2.44%-0.674865%-0.032981%-0.610297%-0.030760%-0.707846%0.71%0.674865%0.610297%0.674865%0.67%76,59776.6k6.914%6.91%-0.736133%-0.038631%-0.672672%-0.012121%-0.774764%0.77%0.736133%0.672672%0.736133%0.74%83,69883.7k7.554%7.55%-0.716601%-0.033829%-0.669774%-0.750430%0.75%0.716601%0.669774%0.001370%0.716601%0.72%81,26881.3k7.335%7.34%-0.666652%-0.045274%-0.668957%-0.711925%0.71%0.666652%0.668957%0.000957%0.666652%0.67%76,36876.4k6.893%6.89%-0.645946%-0.024045%-0.661266%-0.669991%0.67%0.645946%0.661266%0.007922%0.645946%0.65%72,89872.9k6.580%6.58%-0.634411%-0.017564%-0.705425%-0.651976%0.65%0.634411%0.705425%0.028957%0.634411%0.63%71,26171.3k6.432%6.43%-0.603326%-0.730940%-0.603326%0.60%0.603326%0.010560%0.730940%0.048142%0.613886%0.61%67,42967.4k6.086%6.09%-0.615565%-0.006860%-0.713830%-0.622425%0.62%0.615565%0.713830%0.047764%0.615565%0.62%41,14841.1k3.714%3.71%-0.578920%-0.720108%-0.578920%0.58%0.578920%0.061827%0.720108%0.071664%0.640747%0.64%13,51313.5k1.220%1.22%-0.550579%-0.741386%-0.550579%0.55%0.550579%0.094140%0.741386%0.058263%0.644719%0.64%13,24313.2k1.195%1.20%-0.575310%-0.672557%-0.575310%0.58%0.575310%0.044227%0.672557%0.037001%0.619537%0.62%26,47626.5k2.390%2.39%-0.674053%-0.659372%-0.674053%0.67%0.674053%0.037969%0.659372%0.030790%0.712022%0.71%46,07046.1k4.158%4.16%-0.647553%-0.642360%-0.647553%0.65%0.647553%0.053451%0.642360%0.027891%0.701004%0.70%74,70574.7k6.743%6.74%-0.672103%-0.002365%-0.643238%-0.674468%0.67%0.672103%0.643238%0.027157%0.672103%0.67%74,59574.6k6.733%6.73%-0.579209%-0.632325%-0.579209%0.58%0.579209%0.020272%0.632325%0.028642%0.599481%0.60%65,29565.3k5.893%5.89%
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 Contra Costa County
More Females More Males
California
Contra Costa County
100%50%0%M:FFM85+80-8475-7970-7467-6965-6662-6460-6155-5950-5445-4940-4435-3930-3425-2922-24212018-1915-1710-145-90-4-104.956103%-81.049811%-104.956103%105.0%0.4880.4967.208%67.2%32.792%32.8%-34.850922%-36.274956%-34.850922%34.9%0.7420.7457.420%57.4%42.580%42.6%-19.875882%-24.884451%-19.875882%19.9%0.8340.8354.520%54.5%45.480%45.5%-20.405039%-17.158978%-20.405039%20.4%0.8310.8354.629%54.6%45.371%45.4%-12.967174%-14.302341%-12.967174%13.0%0.8850.8953.044%53.0%46.956%47.0%-19.348534%-12.442599%-19.348534%19.3%0.8380.8454.410%54.4%45.590%45.6%-18.648542%-9.736728%-18.648542%18.6%0.8430.8454.265%54.3%45.735%45.7%-7.289433%-7.368277%-7.289433%7.3%0.9320.9351.758%51.8%48.242%48.2%-4.886987%-5.040236%-4.886987%4.9%0.9530.9551.193%51.2%48.807%48.8%-5.247799%-1.801966%-5.247799%5.2%0.9500.9551.278%51.3%48.722%48.7%-4.720760%-4.720760%4.7%0.204484%0.9550.9551.153%51.2%48.847%48.8%-6.791227%-6.791227%6.8%0.143012%0.9360.9451.642%51.6%48.358%48.4%-3.722438%-3.722438%3.7%1.197933%0.9640.9650.914%50.9%49.086%49.1%-2.768609%-2.768609%2.8%4.104936%0.9730.9750.683%50.7%49.317%49.3%1.750344%6.586347%1.750344%1.8%1.0181.0249.566%49.6%50.434%50.4%-1.114370%-1.114370%1.1%6.691182%0.9890.9950.277%50.3%49.723%49.7%10.679763%9.951788%10.679763%10.7%1.1071.1147.465%47.5%52.535%52.5%17.098361%7.858621%17.098361%17.1%1.1711.1746.062%46.1%53.938%53.9%7.687480%5.501565%7.687480%7.7%1.0771.0848.149%48.1%51.851%51.9%5.632923%4.669609%5.632923%5.6%1.0561.0648.630%48.6%51.370%51.4%8.254349%4.341943%8.254349%8.3%1.0831.0848.018%48.0%51.982%52.0%-0.351848%-0.351848%0.4%4.221871%0.9961.0050.088%50.1%49.912%49.9%3.499969%4.529655%3.499969%3.5%1.0351.0349.140%49.1%50.860%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 Contra Costa County

Children Age Cohorts by County Subdivision#5

Percentage of population aged 0 to 17 (%):
13.9%17.2%20.6%23.9%27.2%30.6%

College Age Cohorts by County Subdivision#6

Percentage of population aged 18 to 21 (%):
3.5%4.2%4.9%5.7%6.4%7.1%

20s Age Cohorts by County Subdivision#7

Percentage of population aged 22 to 29 (%):
6.4%7.6%8.8%9.9%11.1%12.3%

30s Age Cohorts by County Subdivision#8

Percentage of population aged 30 to 39 (%):
9.6%10.7%11.7%12.8%13.8%14.9%

40s Age Cohorts by County Subdivision#9

Percentage of population aged 40 to 49 (%):
12.4%13.9%15.2%16.6%18.0%19.4%

50s Age Cohorts by County Subdivision#10

Percentage of population aged 50 to 59 (%):
13.3%14.8%16.2%17.6%19.1%20.5%

60s Age Cohorts by County Subdivision#11

Percentage of population aged 60 to 69 (%):
7.7%9.7%11.7%13.6%15.6%17.6%

70s Age Cohorts by County Subdivision#12

Percentage of population aged 70 to 79 (%):
3.7%4.4%5.0%5.6%6.3%7.0%

80+ Age Cohorts by County Subdivision#13

Percentage of population aged 80 and older (%):
1.8%2.5%3.0%3.6%4.2%4.8%
Road Data ©OpenStreetMap

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Map of Age Cohorts by Tract in Contra Costa County

Children Age Cohorts by Tract#14

Percentage of population aged 0 to 17 (%):
0%8%16%24%33%41%

College Age Cohorts by Tract#15

Percentage of population aged 18 to 21 (%):
0%7%14%21%28%35%

20s Age Cohorts by Tract#16

Percentage of population aged 22 to 29 (%):
0%5%10%16%21%26%

30s Age Cohorts by Tract#17

Percentage of population aged 30 to 39 (%):
0%5%11%16%22%28%

40s Age Cohorts by Tract#18

Percentage of population aged 40 to 49 (%):
0%6%11%16%21%27%

50s Age Cohorts by Tract#19

Percentage of population aged 50 to 59 (%):
3.7%8.1%12.5%16.9%21.3%25.7%

60s Age Cohorts by Tract#20

Percentage of population aged 60 to 69 (%):
2.4%6.9%11.4%15.9%20.3%24.8%

70s Age Cohorts by Tract#21

Percentage of population aged 70 to 79 (%):
0%8%15%22%30%37%

80+ Age Cohorts by Tract#22

Percentage of population aged 80 and older (%):
0%9%17%26%35%44%
Road Data ©OpenStreetMap

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Map of Age Cohorts by Block Group in Contra Costa County

Children Age Cohorts by Block Group#23

Percentage of population aged 0 to 17 (%):
0%9%18%27%36%46%

College Age Cohorts by Block Group#24

Percentage of population aged 18 to 21 (%):
0%12%25%37%50%63%

20s Age Cohorts by Block Group#25

Percentage of population aged 22 to 29 (%):
0%6%13%19%26%33%

30s Age Cohorts by Block Group#26

Percentage of population aged 30 to 39 (%):
0%7%14%21%28%35%

40s Age Cohorts by Block Group#27

Percentage of population aged 40 to 49 (%):
0%7%14%21%29%36%

50s Age Cohorts by Block Group#28

Percentage of population aged 50 to 59 (%):
0%7%15%22%30%38%

60s Age Cohorts by Block Group#29

Percentage of population aged 60 to 69 (%):
0%6%13%19%25%32%

70s Age Cohorts by Block Group#30

Percentage of population aged 70 to 79 (%):
0%8%16%24%32%40%

80+ Age Cohorts by Block Group#31

Percentage of population aged 80 and older (%):
0%10%20%29%39%49%
Road Data ©OpenStreetMap

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Age Cohorts by Place in Contra Costa County

There are 53 places in Contra Costa County. This section compares all 53 of those to each other, Contra Costa County, and other entities that contain or substantially overlap with Contra Costa County.

Children by Place#32

Percentage of population aged 0 to 17 (%):
Scope: population of Contra Costa County, selected places in Contra Costa County, and entities that contain Contra Costa County
0%10%20%30%Count#Camino TassajaraNorris CanyonNorth RichmondN RichmondBay PointSan RamonAcalanes RidgeAcalanes RdgBrentwoodOakleyDanvilleShell RidgeSaranapByronAntiochLafayettePittsburgDiscovery BaySan PabloAlamoClaytonSan MiguelCastle HillWestRollingwoodCaliforniaMountain ViewContra Costa CountyContra CostaPacificOrindaUnited States of AmericaUnited StatesRichmondMontalvin ManorMontalvin MnrVine HillRodeoConcordBlackhawkSan Francisco, Oakland, and Hayward Metro AreaSan FranciscoHerculesMartinezKensingtonWalnut CreekPachecoClydeBethel IslandContra Costa CentrePort Costa39.756944%39.756944%39.8%1,374133.652008%33.652008%33.7%352233.399356%33.399356%33.4%1,349329.709048%29.709048%29.7%6,872429.686954%29.686954%29.7%22,07722.1k529.200000%29.200000%29.2%292627.786659%27.786659%27.8%15,81715.8k727.622665%27.622665%27.6%10,76410.8k827.558389%27.558389%27.6%12,05912.1k926.625111%26.625111%26.6%2991026.597971%26.597971%26.6%1,6521126.032190%26.032190%26.0%3721225.860594%25.860594%25.9%28,10428.1k1325.700327%25.700327%25.7%6,5231425.593400%25.593400%25.6%17,40317.4k1525.553674%25.553674%25.6%3,7731625.417625%25.417625%25.4%7,6231725.239458%25.239458%25.2%4,0581824.641785%24.641785%24.6%2,8721924.579963%24.579963%24.6%7902024.542429%24.542429%24.5%2952123.760486%23.760486%23.8%17,834,66617.8M23.707830%23.707830%23.7%7662223.646283%23.646283%23.6%9,140,2839.14M23.597679%23.597679%23.6%6102323.527315%23.527315%23.5%260,665261k23.336041%23.336041%23.3%12,102,10512.1M23.135826%23.135826%23.1%4,3812423.108006%23.108006%23.1%73,612,43873.6M22.855323%22.855323%22.9%24,75324.8k2522.841840%22.841840%22.8%7252622.631332%22.631332%22.6%9652722.198408%22.198408%22.2%2,1752822.102129%22.102129%22.1%28,05628.1k2921.968737%21.968737%22.0%2,0803020.429183%20.429183%20.4%935,152935k20.207109%20.207109%20.2%5,0543418.977733%18.977733%19.0%7,1253817.815066%17.815066%17.8%9984116.340575%16.340575%16.3%11,04111.0k4514.166051%14.166051%14.2%5754912.862547%12.862547%12.9%1025012.096407%12.096407%12.1%266519.063005%9.063005%9.1%561525.263158%5.263158%5.3%1253
Count number of children
# rank of place out of 53 by %

Age Cohorts by County Subdivision in Contra Costa County

There are 6 county subdivisions in Contra Costa County. This section compares all 6 of those to each other, Contra Costa County, and other entities that contain or substantially overlap with Contra Costa County.

Children by County Subdivision#41

Percentage of population aged 0 to 17 (%):
Scope: population of Contra Costa County, selected county subdivisions in Contra Costa County, and entities that contain Contra Costa County
0%10%20%30%Count#TassajaraEast Contra CostaE Contra CostaAntioch-PittsburgWestCaliforniaContra Costa CountyContra CostaPacificUnited States of AmericaUnited StatesCentral Contra CostaCntrl Contra CostaWest Contra CostaW Contra CostaSan Francisco, Oakland, and Hayward Metro AreaSan FranciscoBriones30.556964%30.556964%30.6%19,27919.3k127.224874%27.224874%27.2%35,99736.0k226.182218%26.182218%26.2%40,68940.7k323.760486%23.760486%23.8%17,834,66617.8M23.646283%23.646283%23.6%9,140,2839.14M23.527315%23.527315%23.5%260,665261k23.336041%23.336041%23.3%12,102,10512.1M23.108006%23.108006%23.1%73,612,43873.6M21.890089%21.890089%21.9%108,396108k421.643526%21.643526%21.6%55,57355.6k520.429183%20.429183%20.4%935,152935k13.905269%13.905269%13.9%7316
Count number of children
# rank of county subdivision out of 6 by %

Age Cohorts by County in the San Francisco Area

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

Children by County#50

Percentage of population aged 0 to 17 (%):
Scope: population of Contra Costa County, selected other counties in the San Francisco Area, and entities that contain Contra Costa 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 Contra Costa County to the 50 most populous counties in California and to those entities that contain or substantially overlap with Contra Costa County. The least populous of the compared counties has a population of 21,361.

Children by County#59

Percentage of population aged 0 to 17 (%):
Scope: population of Contra Costa County, selected other counties in California, and entities that contain Contra Costa 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 Contra Costa County to the 50 most populous counties in the United States and to those entities that contain or substantially overlap with Contra Costa County. The least populous of the compared counties has a population of 941,618.

Children by County#68

Percentage of population aged 0 to 17 (%):
Scope: population of Contra Costa County, selected other counties in the United States, and entities that contain Contra Costa 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 CountyCuyahogaAlameda 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%271,499271k4221.443331%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:
San Ramon, Walnut Creek
Cities:
Antioch, Brentwood, Clayton, Concord, El Cerrito, Hercules, Lafayette, Martinez, Oakley, Orinda, Pinole, Pittsburg, Pleasant Hill, Richmond, San Pablo, San Ramon, Walnut Creek
Towns:
Danville, Moraga
Unincorporated Places:
Acalanes Ridge, Alamo, Alhambra Valley, Bay Point, Bayview, Bethel Island, Blackhawk, Byron, Camino Tassajara, Castle Hill, Clyde, Contra Costa Centre, Crockett, Diablo, Discovery Bay, East Richmond Heights, El Sobrante, Kensington, Knightsen, Montalvin Manor, Mountain View, Norris Canyon, North Gate, North Richmond, Pacheco, Port Costa, Reliez Valley, Rodeo, Rollingwood, San Miguel, Saranap, Shell Ridge, Tara Hills, Vine Hill
ZIP Codes:
94505, 94506, 94507, 94509, 94511, 94513, 94514, 94516, 94517, 94518, 94519, 94520, 94521, 94523, 94525, 94526, 94528, 94530, 94531, 94547, 94548, 94549, 94551, 94553, 94556, 94561, 94563, 94564, 94565, 94569, 94572, 94575, 94582, 94583, 94588, 94595, 94596, 94597, 94598, 94611, 94706, 94707, 94708, 94801, 94803, 94804, 94805, 94806, 94850, 95219
Unified School Districts:
Antioch, John Swett, Livermore Valley, Martinez, Mount Diablo, Pittsburg, San Ramon Valley, West Contra Costa
Elementary School Districts:
Brentwood, Byron, Canyon, Knightsen, Lafayette, Moraga, Oakley, Orinda, Walnut Creek
Secondary School Districts:
Acalanes, Liberty
Congressional Districts:
CA-5, CA-9, CA-11, CA-15
State Senate Districts:
CA-3, CA-7, CA-9
Assembly Districts:
CA-11, CA-14, CA-15, CA-16
Neighboring Counties:
Alameda, Marin, Sacramento, San Francisco, San Joaquin, Solano, Sonoma
Nearby Counties:
Napa, San Mateo, Santa Clara, Yolo