Onondaga County Flag

Onondaga County

State:
New York
County Seat:
Syracuse

Onondaga County's estimated 2026 population is 464,995 with a growth rate of -0.34% in the past year according to the most recent United States census data. Onondaga County is the 11th largest county in New York. The 2010 population was 467,549 and has seen a growth of -0.55% since that time.

464,995
Total Population
598
Population Density (mi²)
11
Population Rank (State)
-1.6K -0.34%
Annual Population Growth

Onondaga County Population

Demographics

Economics and Income Statistics