Monmouth County Flag

Monmouth County

State:
New Jersey
County Seat:

Monmouth County's estimated 2025 population is 639,941 with a growth rate of -0.22% in the past year according to the most recent United States census data. Monmouth County is the 6th largest county in New Jersey. The 2010 population was 630,454 and has seen a growth of 1.5% since that time.

639,941
Total Population
1,367
Population Density (mi²)
6
Population Rank (State)
-1.4K -0.22%
Annual Population Growth

Monmouth County Population

Demographics

Economics and Income Statistics