Census 2010: Play with the Data

The Bay Area grew at its slowest rate in nearly a century over the past decade, likely signaling a loss of political power to the Central Valley as the redistricting process begins. Meanwhile, the Bay Area’s Asian and Hispanic populations boomed, while the ranks of blacks dwindled in most cities. See how your city or county has changed.
What is redistricting? Why do we have a Census, anyway? Read our full Census coverage here.

Bay Area Counties

5.4%
Population 2000: 6783760
2010: 7150739

The 2010 Census revealed slow growth for the Bay Area’s counties over the last decade, with a gain of just 366,979 people since 2000. The data also shows interesting demographic shifts in race and ethnicity. The combined counties lost about 186,000 whites and 30,000 blacks overall, but gained nearly 370,000 Hispanics and 375,000 Asians. Contra Costa County had the most rapid population growth since 2000, adding 100,000 new residents of all races. Meanwhile Alameda County had the largest exodus of African Americans, losing about 25,000 blacks over the decade.

Population by Race

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Bay Area Counties

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Name	2010 White Population	2000 White Population	2000-2010 Change
Alameda County	649122	704334	7.8%
Contra Costa County	614512	621490	1.1%
Marin County	201963	207800	2.8%
Napa County	97525	99396	1.9%
San Francisco County	390387	385728	1.2%
San Mateo County	383535	420683	8.8%
Santa Clara County	836616	905660	7.6%
Solano County	210751	222387	5.2%
Sonoma County	371412	374209	0.7%

Name	2010 Native Population	2000 Native Population	2000-2010 Change
Alameda County	9799	9146	7.1%
Contra Costa County	6122	5830	5.0%
Marin County	1523	1061	43.5%
Napa County	1058	1045	1.2%
San Francisco County	4024	3458	16.4%
San Mateo County	3306	3140	5.3%
Santa Clara County	12960	11350	14.2%
Solano County	3212	3110	3.3%
Sonoma County	6489	5389	20.4%

Name	2010 2+ Races Population	2000 2+ Races Population	2000-2010 Change
Alameda County	90997	81224	12.0%
Contra Costa County	62225	48714	27.7%
Marin County	10693	8579	24.6%
Napa County	5580	4606	21.1%
San Francisco County	37659	33255	13.2%
San Mateo County	38210	35501	7.6%
Santa Clara County	87248	78437	11.2%
Solano County	31358	25229	24.3%
Sonoma County	21502	18745	14.7%

Name	2010 Asian Population	2000 Asian Population	2000-2010 Change
Alameda County	394560	295218	33.7%
Contra Costa County	151469	103993	45.7%
Marin County	13761	11203	22.8%
Napa County	9223	3694	149.7%
San Francisco County	267915	239565	11.8%
San Mateo County	178118	141684	25.7%
Santa Clara County	570524	430095	32.7%
Solano County	60473	50299	20.2%
Sonoma County	18341	14098	30.1%

Name	2010 Black Population	2000 Black Population	2000-2010 Change
Alameda County	190451	215598	11.7%
Contra Costa County	97161	88813	9.4%
Marin County	6987	7142	2.2%
Napa County	2668	1645	62.2%
San Francisco County	48870	60515	19.2%
San Mateo County	20436	24840	17.7%
Santa Clara County	46428	47182	1.6%
Solano County	60750	58827	3.3%
Sonoma County	7610	6522	16.7%

Name	2010 Islander Population	2000 Islander Population	2000-2010 Change
Alameda County	12802	9142	40.0%
Contra Costa County	4845	3466	39.8%
Marin County	509	388	31.2%
Napa County	372	289	28.7%
San Francisco County	3359	3844	12.6%
San Mateo County	10317	9403	9.7%
Santa Clara County	7060	5773	22.3%
Solano County	3564	3078	15.8%
Sonoma County	1558	934	66.8%

Name	2010 Total Population	2000 Total Population	2000-2010 Change
Alameda County	1510271	1443741	4.6%
Contra Costa County	1049025	948816	10.6%
Marin County	252409	247289	2.1%
Napa County	136484	124279	9.8%
San Francisco County	805235	776733	3.7%
San Mateo County	718451	707161	1.6%
Santa Clara County	1781642	1682585	5.9%
Solano County	413344	394542	4.8%
Sonoma County	483878	458614	5.5%

Name	2010 Hispanic Origin Population	2000 Hispanic Origin Population	2000-2010 Change
Alameda County	339889	273910	24.1%
Contra Costa County	255560	167776	52.3%
Marin County	39069	27351	42.8%
Napa County	44010	29416	49.6%
San Francisco County	121774	109504	11.2%
San Mateo County	182502	154708	18.0%
Santa Clara County	479210	403401	18.8%
Solano County	99356	69598	42.8%
Sonoma County	120430	79511	51.5%