Total Population in Monmouth County, NJ
ACS 2024 5-Year Estimates
645,353
Rank #109/3,222 · #6 in NJ
97th
Monmouth 645,353
NJ 9,343,809 -93.1%
US 330M
Total Population Trend
Rankings →Percentile Rank Over Time
Year-over-Year Population Change
National Distribution
How Monmouth County's total population of 645,353 compares to all 3,222 U.S. counties. Values range from 33 to 9,808,667.
Distribution of Total Population Across All Counties
Ranking Context
Counties ranked closest to Monmouth County for total population.
Nearby Rankings
Full ranking →| #106 | Arapahoe County, CO | 659,844 |
| #107 | Ocean County, NJ | 654,362 |
| #108 | Bucks County, PA | 647,461 |
| #109 | Monmouth County, NJ | 645,353 |
| #110 | Brevard County, FL | 632,780 |
| #111 | Western Connecticut Planning Region, CT | 627,071 |
| #112 | Johnson County, KS | 620,631 |
About Total Population
Monmouth County, New Jersey has a total population of 645,353, ranking #109 of 3,222 counties nationwide — 99.8% below the national value of 330M. Within New Jersey, it ranks #6 of 21. This places it in the 97th percentile nationally.
Total population count from the American Community Survey. Source: U.S. Census Bureau, American Community Survey 2024 5-Year Estimates. All values are estimates derived from survey samples and are subject to margin of error. For more information, see our methodology.