Jefferson County Demographics

A map of Jefferson County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	28,394	28,216	84.6%	85.6%
Multiracial	2,199	1,962	6.5%	5.9%
Hispanic	1,480	1,305	4.4%	4.0%
Native American/Other	955	800	2.8%	2.4%
Asian	434	487	1.3%	1.5%
Black	115	207	0.3%	0.6%

Jefferson County, Washington has an estimated population of 33,577, a slight increase from the 32,977 recorded in the 2020 Census. The population is 84.6% White, 6.5% Multiracial, 4.4% Hispanic, 2.8% Native American/Other, 1.3% Asian, and 0.3% Black. This demographic dot map shows the population of Jefferson County, with one dot drawn for each person counted by the Census, color-coded by race.

Jefferson has become more racially diverse since the 2020 Census. It is considerably less diverse than Washington overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Jefferson County, that probability was 26.2% in 2020 and 27.8% in the most recent ACS estimates.

Jefferson County is ranked the 27th most populous county in Washington, out of 39 counties. Jefferson County was ranked the 27th most populous county in the 2020 Census.

Jefferson County's White Population

28,394 residents of Jefferson County, or 84.6% of the population, identify as White. The share of White residents in Jefferson County is significantly higher than in Washington overall, where 63.1% of the population is White. Jefferson County ranks 6th statewide in terms of White residents as a share of the population, out of 39 counties.

Since the 2020 Census, Jefferson County's White population has remained roughly the same. White residents' share of Jefferson County's population has decreased from 85.6% to 84.6%.

Jefferson County is more White than neighboring Clallam County (80.2% White), Mason County (74.9% White), Grays Harbor County (76% White), and Kitsap County (72.6% White). Jefferson County is less White than neighboring San Juan County (85.2% White).

Jefferson County's Black Population

115 residents of Jefferson County, or 0.3% of the population, identify as Black. The share of Black residents in Jefferson County is slightly lower than in Washington overall, where 3.8% of the population is Black. Jefferson County ranks 22nd statewide in terms of Black residents as a share of the population, out of 39 counties.

Since the 2020 Census, Jefferson County's Black population has declined by an estimated 44.4%. Black residents' share of Jefferson County's population has remained roughly unchanged at 0.3%.

Jefferson County is more Black than neighboring San Juan County (0.2% Black). Jefferson County is less Black than neighboring Clallam County (0.8% Black), Mason County (1% Black), Grays Harbor County (1.5% Black), and Kitsap County (2.2% Black).

Jefferson County's Asian Population

434 residents of Jefferson County, or 1.3% of the population, identify as Asian. The share of Asian residents in Jefferson County is lower than in Washington overall, where 9.7% of the population is Asian. Jefferson County ranks 18th statewide in terms of Asian residents as a share of the population, out of 39 counties.

Since the 2020 Census, Jefferson County's Asian population has declined by an estimated 10.9%. Asian residents' share of Jefferson County's population has remained roughly unchanged at 1.3%.

Jefferson County is more Asian than neighboring Mason County (1% Asian). Jefferson County is less Asian than neighboring Clallam County (1.7% Asian), and Kitsap County (4.8% Asian).

Jefferson County's Hispanic Population

1,480 residents of Jefferson County, or 4.4% of the population, identify as Hispanic. The share of Hispanic residents in Jefferson County is lower than in Washington overall, where 14.4% of the population is Hispanic. Jefferson County ranks 35th statewide in terms of Hispanic residents as a share of the population, out of 39 counties.

Since the 2020 Census, Jefferson County's Hispanic population has grown by an estimated 13.4%. Hispanic residents' share of Jefferson County's population has remained roughly unchanged at 4.4%.

Jefferson County is less Hispanic than neighboring Clallam County (6.8% Hispanic), Mason County (12.8% Hispanic), Grays Harbor County (11.2% Hispanic), Kitsap County (9.4% Hispanic), and San Juan County (7.6% Hispanic).

Jefferson County's Native American/Other Population

955 residents of Jefferson County, or 2.8% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Jefferson County is comparable to the share in Washington overall, where 2.1% of the population is Native American/Other. Jefferson County ranks 18th statewide in terms of Native American/Other residents as a share of the population, out of 39 counties.

Since the 2020 Census, Jefferson County's Native American/Other population has grown by an estimated 19.4%. Native American/Other residents' share of Jefferson County's population has remained roughly unchanged at 2.8%.

Jefferson County is more Native American/Other than neighboring Mason County (2.6% Native American/Other), Kitsap County (2.4% Native American/Other), and San Juan County (1% Native American/Other). Jefferson County is less Native American/Other than neighboring Clallam County (3.8% Native American/Other), and Grays Harbor County (4.7% Native American/Other).

Jefferson County's Multiracial Population

2,199 residents of Jefferson County, or 6.5% of the population, identify as Multiracial. The share of Multiracial residents in Jefferson County is comparable to the share in Washington overall, where 6.8% of the population is Multiracial. Jefferson County ranks 19th statewide in terms of Multiracial residents as a share of the population, out of 39 counties.

Since the 2020 Census, Jefferson County's Multiracial population has grown by an estimated 12.1%. Multiracial residents' share of Jefferson County's population has increased from 5.9% to 6.5%.

Jefferson County is more Multiracial than neighboring Grays Harbor County (5.2% Multiracial), and San Juan County (4.6% Multiracial). Jefferson County is less Multiracial than neighboring Clallam County (6.7% Multiracial), Mason County (7.7% Multiracial), and Kitsap County (8.6% 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.