Onondaga County Demographics

A map of Onondaga County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	347,603	347,290	73.8%	72.9%
Black	48,051	54,410	10.2%	11.4%
Hispanic	27,930	26,572	5.9%	5.6%
Multiracial	24,407	23,124	5.2%	4.9%
Asian	19,309	20,119	4.1%	4.2%
Native American/Other	3,829	5,001	0.8%	1.0%

Onondaga County, New York has an estimated population of 471,129, a slight decrease from the 476,516 recorded in the 2020 Census. The population is 73.8% White, 10.2% Black, 5.9% Hispanic, 5.2% Multiracial, 4.1% Asian, and 0.8% Native American/Other. This demographic dot map shows the population of Onondaga County, with one dot drawn for each person counted by the Census, color-coded by race.

Onondaga has become less racially diverse since the 2020 Census. It is considerably less diverse than New York overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Onondaga County, that probability was 44.8% in 2020 and 43.7% in the most recent ACS estimates.

Onondaga County is ranked the 11th most populous county in New York, out of 62 counties. Onondaga County was ranked the 11th most populous county in the 2020 Census.

Onondaga County's White Population

347,603 residents of Onondaga County, or 73.8% of the population, identify as White. The share of White residents in Onondaga County is significantly higher than in New York overall, where 52.8% of the population is White. Onondaga County ranks 45th statewide in terms of White residents as a share of the population, out of 62 counties.

Since the 2020 Census, Onondaga County's White population has remained roughly the same. White residents' share of Onondaga County's population has increased from 72.9% to 73.8%.

Onondaga County is more White than neighboring Tompkins County (73.7% White). Onondaga County is less White than neighboring Cayuga County (86.9% White), Cortland County (89.2% White), Oswego County (90.8% White), and Madison County (89.6% White).

Onondaga County's Black Population

48,051 residents of Onondaga County, or 10.2% of the population, identify as Black. The share of Black residents in Onondaga County is slightly lower than in New York overall, where 13.4% of the population is Black. Onondaga County ranks 9th statewide in terms of Black residents as a share of the population, out of 62 counties.

Since the 2020 Census, Onondaga County's Black population has declined by an estimated 11.7%. Black residents' share of Onondaga County's population has decreased from 11.4% to 10.2%.

Onondaga County is more Black than neighboring Cayuga County (3.3% Black), Cortland County (1.7% Black), Oswego County (0.9% Black), Madison County (1.8% Black), and Tompkins County (3.6% Black).

Onondaga County's Asian Population

19,309 residents of Onondaga County, or 4.1% of the population, identify as Asian. The share of Asian residents in Onondaga County is slightly lower than in New York overall, where 9% of the population is Asian. Onondaga County ranks 17th statewide in terms of Asian residents as a share of the population, out of 62 counties.

Since the 2020 Census, Onondaga County's Asian population has declined by an estimated 4.0%. Asian residents' share of Onondaga County's population has remained roughly unchanged at 4.1%.

Onondaga County is more Asian than neighboring Cayuga County (0.7% Asian), Cortland County (1.4% Asian), Oswego County (0.8% Asian), and Madison County (1.2% Asian). Onondaga County is less Asian than neighboring Tompkins County (10.1% Asian).

Onondaga County's Hispanic Population

27,930 residents of Onondaga County, or 5.9% of the population, identify as Hispanic. The share of Hispanic residents in Onondaga County is considerably lower than in New York overall, where 19.8% of the population is Hispanic. Onondaga County ranks 27th statewide in terms of Hispanic residents as a share of the population, out of 62 counties.

Since the 2020 Census, Onondaga County's Hispanic population has grown by an estimated 5.1%. Hispanic residents' share of Onondaga County's population has remained roughly unchanged at 5.9%.

Onondaga County is more Hispanic than neighboring Cayuga County (3.6% Hispanic), Cortland County (3.6% Hispanic), Oswego County (3.3% Hispanic), and Madison County (2.6% Hispanic). Onondaga County is less Hispanic than neighboring Tompkins County (6.6% Hispanic).

Onondaga County's Native American/Other Population

3,829 residents of Onondaga County, or 0.8% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Onondaga County is comparable to the share in New York overall, where 1.2% of the population is Native American/Other. Onondaga County ranks 12th statewide in terms of Native American/Other residents as a share of the population, out of 62 counties.

Since the 2020 Census, Onondaga County's Native American/Other population has declined by an estimated 23.4%. Native American/Other residents' share of Onondaga County's population has remained roughly unchanged at 0.8%.

Onondaga County is more Native American/Other than neighboring Cayuga County (0.6% Native American/Other), Cortland County (0.5% Native American/Other), Oswego County (0.5% Native American/Other), and Madison County (0.7% Native American/Other). Onondaga County is less Native American/Other than neighboring Tompkins County (1.3% Native American/Other).

Onondaga County's Multiracial Population

24,407 residents of Onondaga County, or 5.2% of the population, identify as Multiracial. The share of Multiracial residents in Onondaga County is comparable to the share in New York overall, where 3.8% of the population is Multiracial. Onondaga County ranks 8th statewide in terms of Multiracial residents as a share of the population, out of 62 counties.

Since the 2020 Census, Onondaga County's Multiracial population has grown by an estimated 5.5%. Multiracial residents' share of Onondaga County's population has remained roughly unchanged at 5.2%.

Onondaga County is more Multiracial than neighboring Cayuga County (4.9% Multiracial), Cortland County (3.6% Multiracial), Oswego County (3.6% Multiracial), Madison County (4% Multiracial), and Tompkins County (4.7% 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.