Solano County Demographics

A map of Solano County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	150,061	155,125	33.2%	34.2%
Hispanic	133,953	128,155	29.6%	28.3%
Asian	71,955	70,953	15.9%	15.6%
Black	55,694	60,051	12.3%	13.2%
Multiracial	31,322	30,820	6.9%	6.8%
Native American/Other	8,933	8,387	2.0%	1.8%

Solano County, California has an estimated population of 451,918, a less than 1% change from the 453,491 recorded in the 2020 Census. The population is 33.2% White, 29.6% Hispanic, 15.9% Asian, 12.3% Black, 6.9% Multiracial, and 2.0% Native American/Other. This demographic dot map shows the population of Solano County, with one dot drawn for each person counted by the Census, color-coded by race.

Solano is about as racially diverse as it was in the 2020 Census. It is considerably more diverse than California overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Solano County, that probability was 75.6% in 2020 and 75.6% in the most recent ACS estimates.

Solano County is ranked the 19th most populous county in California, out of 58 counties. Solano County was ranked the 19th most populous county in the 2020 Census.

Solano County's White Population

150,061 residents of Solano County, or 33.2% of the population, identify as White. The share of White residents in Solano County is comparable to the share in California overall, where 33.8% of the population is White. Solano County ranks 42nd statewide in terms of White residents as a share of the population, out of 58 counties.

Since the 2020 Census, Solano County's White population has declined by an estimated 3.3%. White residents' share of Solano County's population has decreased from 34.2% to 33.2%.

Solano County is more White than neighboring Alameda County (27.4% White). Solano County is less White than neighboring Contra Costa County (38.1% White), Yolo County (41.8% White), Napa County (48.6% White), and Sacramento County (40.6% White).

Solano County's Black Population

55,694 residents of Solano County, or 12.3% of the population, identify as Black. The share of Black residents in Solano County is higher than in California overall, where 5.2% of the population is Black. Solano County ranks 1st statewide in terms of Black residents as a share of the population, out of 58 counties.

Since the 2020 Census, Solano County's Black population has declined by an estimated 7.3%. Black residents' share of Solano County's population has decreased from 13.2% to 12.3%.

Solano County is more Black than neighboring Contra Costa County (7.9% Black), Yolo County (2.4% Black), Napa County (1.7% Black), Alameda County (9.3% Black), and Sacramento County (9% Black).

Solano County's Asian Population

71,955 residents of Solano County, or 15.9% of the population, identify as Asian. The share of Asian residents in Solano County is comparable to the share in California overall, where 15.3% of the population is Asian. Solano County ranks 10th statewide in terms of Asian residents as a share of the population, out of 58 counties.

Since the 2020 Census, Solano County's Asian population has grown by an estimated 1.4%. Asian residents' share of Solano County's population has remained roughly unchanged at 15.9%.

Solano County is more Asian than neighboring Yolo County (14.9% Asian), and Napa County (8.1% Asian). Solano County is less Asian than neighboring Contra Costa County (18.6% Asian), Alameda County (32.7% Asian), and Sacramento County (17.6% Asian).

Solano County's Hispanic Population

133,953 residents of Solano County, or 29.6% of the population, identify as Hispanic. The share of Hispanic residents in Solano County is considerably lower than in California overall, where 40.2% of the population is Hispanic. Solano County ranks 27th statewide in terms of Hispanic residents as a share of the population, out of 58 counties.

Since the 2020 Census, Solano County's Hispanic population has grown by an estimated 4.5%. Hispanic residents' share of Solano County's population has increased from 28.3% to 29.6%.

Solano County is more Hispanic than neighboring Contra Costa County (27.6% Hispanic), Alameda County (23.4% Hispanic), and Sacramento County (24.2% Hispanic). Solano County is less Hispanic than neighboring Yolo County (33.4% Hispanic), and Napa County (36.4% Hispanic).

Solano County's Native American/Other Population

8,933 residents of Solano County, or 2.0% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Solano County is comparable to the share in California overall, where 1.2% of the population is Native American/Other. Solano County ranks 25th statewide in terms of Native American/Other residents as a share of the population, out of 58 counties.

Since the 2020 Census, Solano County's Native American/Other population has grown by an estimated 6.5%. Native American/Other residents' share of Solano County's population has remained roughly unchanged at 2.0%.

Solano County is more Native American/Other than neighboring Contra Costa County (1.4% Native American/Other), Yolo County (1.4% Native American/Other), Napa County (0.9% Native American/Other), and Alameda County (1.6% Native American/Other).

Solano County's Multiracial Population

31,322 residents of Solano County, or 6.9% of the population, identify as Multiracial. The share of Multiracial residents in Solano County is slightly higher than in California overall, where 4.4% of the population is Multiracial. Solano County ranks 7th statewide in terms of Multiracial residents as a share of the population, out of 58 counties.

Since the 2020 Census, Solano County's Multiracial population has grown by an estimated 1.6%. Multiracial residents' share of Solano County's population has remained roughly unchanged at 6.9%.

Solano County is more Multiracial than neighboring Contra Costa County (6.3% Multiracial), Yolo County (6.1% Multiracial), Napa County (4.4% Multiracial), Alameda County (5.6% Multiracial), and Sacramento County (6.7% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.