Monmouth County, New Jersey Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 6th-largest in New Jersey
The population of Monmouth County, New Jersey is 643,615 as of the 2023 American Community Survey, making it the 6th-largest county in New Jersey. The median household income is $122,727, the median home value is $566,500, and the median age is 43.2.
The population of Monmouth County has grown 2.7% since 2010 (630,454 → 647,520), a +0.19% annualized rate.
643,615
Population
+0.19%
Annual growth
1375
People / sq mi
$122,727
Median Income
$566,500
Median Home Value
Monmouth County covers 468 sq mi of land at 1374.6 people per square mile.
About Monmouth County, NJ
Monmouth County is a county in New Jersey with a population of 643,615. It ranks #6 among counties in New Jersey by population. The median age is 43.2, older than the national median. The population is 49.0% male and 51.0% female.
The median household income in Monmouth County is $122,727, above the US median of $74,580. 4.2% of residents live below the federal poverty level. Home values sit at a median of $566,500, with monthly rent averaging $1,771. The homeownership rate of 75.4% is higher than the national rate of 64.8%.
Educational attainment in Monmouth County reflects 50.6% of adults 25 and older holding a bachelor's degree or higher, above the national average of 34.3%. Roughly 16.8% of workers primarily work from home, similar to the national work-from-home rate of 14.2%. The average commute is 32.8 minutes each way.
Monmouth County Population History (2010-2024)
The county of Monmouth County had a population of 630,454 in 2010 and 647,520 in 2024, a 2.7% growth over 14 years. The peak was 647,520 in 2024. Average annual growth rate: 0.20%.
647,520
Population (2024)
630,454
Population (2010)
647,520
Peak (2024)
0.20%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 630,454 |
| 2011 | 629,144 |
| 2012 | 627,682 |
| 2013 | 626,964 |
| 2014 | 625,581 |
| 2015 | 624,180 |
| 2016 | 623,055 |
| 2017 | 622,122 |
| 2018 | 620,859 |
| 2019 | 619,687 |
| 2020 | 642,778 |
| 2021 | 646,531 |
| 2022 | 644,994 |
| 2023 | 644,941 |
| 2024 | 647,520 |
Race & Ethnicity
| White | 76.2% |
| Black or African American | 6.2% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.1% |
| Two or More Races | 0.0% |
Age & Sex
43.2
Median Age
51.0%
Female
49.0%
Male
18.5%
Age 65+
Age Distribution
Children (under 15): 16.9% · Seniors (65+): 18.5%
Income & Poverty
| Median household income | $122,727+$21,677 vs state |
| Mean household income | $168,016 |
| Per-capita income | $65,545 |
| Poverty rate | 4.2%-2.8% vs state |
| Unemployment rate | 3.5% |
| Employment-to-population | 62.9% |
Top Industries by Employment
The largest employment sector in Monmouth County is professional & business services, accounting for 24.4% of workers.
How residents commute
5.5%
Drive alone
1.5%
Carpool
66.8%
Public transit
16.8%
Work from home
32.8 min
Avg commute
Housing
$566,500+$138,900 vs state
Median home value
$1,771
Median rent
75.4%
Homeownership rate
269,728
Total housing units
92.8%
Occupied
7.2%
Vacant
24.6%
Renter-occupied
Social & access
94.8%
With health insurance
95.8%
With broadband internet
27.7%
Foreign-born
4.2%
Veterans (18+)
10.4%
With a disability
81.8%
Speak language other than English at home
Education
94.2%
High School+
50.6%
Bachelor's+
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Common questions about Monmouth County, NJ
Frequently Asked Questions
Monmouth County, New Jersey has a population of 643,615 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 6th-largest county in New Jersey. Population density is 1375 people per square mile.
The population of Monmouth County has grown 2.7% since 2010 (630,454 → 647,520), a +0.19% annualized rate.
The median household income in Monmouth County, New Jersey is $122,727, with mean (average) household income of $168,016 and per-capita income of $65,545. 4.2% of residents live below the federal poverty level.
In Monmouth County, the largest racial and ethnic groups are White (76.2%), Black or African American (6.2%), Hispanic or Latino (1.1%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Monmouth County, New Jersey is 43.2 years. Residents are 51.0% female and 49.0% male.
The median home value in Monmouth County is $566,500 and median monthly rent is $1,771. 75.4% of occupied housing units are owner-occupied. The county has 269,728 total housing units, 7.2% of which are vacant.
The largest employment sector in Monmouth County, New Jersey is professional, scientific, and management services, employing 24.4% of workers. The unemployment rate is 3.5%.
Newark is among the largest cities associated with Monmouth County, New Jersey, with a population of 307,188.
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.