Jefferson County Demographics

A map of Jefferson County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	41,871	42,317	95.5%	95.1%
Multiracial	1,131	1,408	2.6%	3.2%
Hispanic	446	397	1.0%	0.9%
Native American/Other	169	145	0.4%	0.3%
Black	137	125	0.3%	0.3%
Asian	110	100	0.3%	0.2%

Jefferson County, Pennsylvania has an estimated population of 43,864, a slight decrease from the 44,492 recorded in the 2020 Census. The population is 95.5% White, 2.6% Multiracial, 1.0% Hispanic, 0.4% Native American/Other, 0.3% Black, and 0.3% Asian. 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 slightly less racially diverse since the 2020 Census. It is considerably less diverse than Pennsylvania 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 9.4% in 2020 and 8.8% in the most recent ACS estimates.

Jefferson County is ranked the 48th most populous county in Pennsylvania, out of 67 counties. Jefferson County was ranked the 48th most populous county in the 2020 Census.

Jefferson County's White Population

41,871 residents of Jefferson County, or 95.5% of the population, identify as White. The share of White residents in Jefferson County is significantly higher than in Pennsylvania overall, where 73% of the population is White. Jefferson County ranks 2nd statewide in terms of White residents as a share of the population, out of 67 counties.

Since the 2020 Census, Jefferson County's White population has declined by an estimated 1.1%. White residents' share of Jefferson County's population has remained roughly unchanged at 95.5%.

Jefferson County is more White than neighboring Clarion County (94.1% White), Forest County (78.3% White), Elk County (94.5% White), Indiana County (91.7% White), and Clearfield County (92% White).

Jefferson County's Black Population

137 residents of Jefferson County, or 0.3% of the population, identify as Black. The share of Black residents in Jefferson County is lower than in Pennsylvania overall, where 10.3% of the population is Black. Jefferson County ranks 64th statewide in terms of Black residents as a share of the population, out of 67 counties.

Since the 2020 Census, Jefferson County's Black population has grown by an estimated 9.6%. Black residents' share of Jefferson County's population has remained roughly unchanged at 0.3%.

Jefferson County is less Black than neighboring Clarion County (1.6% Black), Forest County (13.7% Black), Elk County (0.6% Black), Indiana County (2.1% Black), and Clearfield County (1.9% Black).

Jefferson County's Asian Population

110 residents of Jefferson County, or 0.3% of the population, identify as Asian. The share of Asian residents in Jefferson County is slightly lower than in Pennsylvania overall, where 3.8% of the population is Asian. Jefferson County ranks 66th statewide in terms of Asian residents as a share of the population, out of 67 counties.

Since the 2020 Census, Jefferson County's Asian population has grown by an estimated 10.0%. Asian residents' share of Jefferson County's population has remained roughly unchanged at 0.3%.

Jefferson County is less Asian than neighboring Clarion County (0.7% Asian), Forest County (0.4% Asian), Elk County (0.4% Asian), Indiana County (0.9% Asian), and Clearfield County (0.6% Asian).

Jefferson County's Hispanic Population

446 residents of Jefferson County, or 1.0% of the population, identify as Hispanic. The share of Hispanic residents in Jefferson County is lower than in Pennsylvania overall, where 8.7% of the population is Hispanic. Jefferson County ranks 66th statewide in terms of Hispanic residents as a share of the population, out of 67 counties.

Since the 2020 Census, Jefferson County's Hispanic population has grown by an estimated 12.3%. Hispanic residents' share of Jefferson County's population has remained roughly unchanged at 1.0%.

Jefferson County is less Hispanic than neighboring Clarion County (1.2% Hispanic), Forest County (5.1% Hispanic), Indiana County (1.9% Hispanic), and Clearfield County (3% Hispanic).

Jefferson County's Native American/Other Population

169 residents of Jefferson County, or 0.4% 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 Pennsylvania overall, where 0.6% of the population is Native American/Other. Jefferson County ranks 53rd statewide in terms of Native American/Other residents as a share of the population, out of 67 counties.

Since the 2020 Census, Jefferson County's Native American/Other population has grown by an estimated 16.6%. Native American/Other residents' share of Jefferson County's population has remained roughly unchanged at 0.4%.

Jefferson County is more Native American/Other than neighboring Clarion County (0.2% Native American/Other), Elk County (0% Native American/Other), Indiana County (0.1% Native American/Other), and Clearfield County (0.2% Native American/Other).

Jefferson County's Multiracial Population

1,131 residents of Jefferson County, or 2.6% of the population, identify as Multiracial. The share of Multiracial residents in Jefferson County is comparable to the share in Pennsylvania overall, where 3.6% of the population is Multiracial. Jefferson County ranks 40th statewide in terms of Multiracial residents as a share of the population, out of 67 counties.

Since the 2020 Census, Jefferson County's Multiracial population has declined by an estimated 19.7%. Multiracial residents' share of Jefferson County's population has decreased from 3.2% to 2.6%.

Jefferson County is more Multiracial than neighboring Clarion County (2.3% Multiracial), Forest County (2% Multiracial), and Clearfield County (2.3% Multiracial). Jefferson County is less Multiracial than neighboring Elk County (3.4% Multiracial), and Indiana County (3.3% 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.