Monmouth County Population

1790–2026

653.4K

2026 projection

1.7% since 2020 (increase)

0100K200K300K400K500K600K700K18001850190019502000

Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.

Use the left and right arrow keys to inspect population observations.

Population by year

Population estimates for Monmouth County. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
2026653,397+2,3620.36%
2025651,035+2,3620.36%
2024648,673+2,8770.45%
2023645,796+7700.12%
2022645,026-8470.13%
2021645,873+3,4880.54%
2020642,385+22,6983.66%
2019619,687-1,1720.19%
2018620,859-1,2630.20%
2017622,122-9330.15%

Showing 10 of 38 years.

Monmouth County Demographics

43.2median age

Median age

Female44.6 yrs
Male41.9 yrs

Adults

510,607
123,370 seniors (65+) · 24% of adults387,237 other adults

Sex

Female 51% · 329,001Male 49% · 316,352

Population by age

MaleFemale85+ years, male: 5,22285+ years, female: 9,54080–84 years, male: 5,44180–84 years, female: 7,26275–79 years, male: 10,04075–79 years, female: 12,70070–74 years, male: 14,79970–74 years, female: 17,57665–69 years, male: 19,93665–69 years, female: 20,85460–64 years, male: 25,21060–64 years, female: 26,69755–59 years, male: 23,94955–59 years, female: 24,56250–54 years, male: 22,61650–54 years, female: 23,34745–49 years, male: 19,85245–49 years, female: 20,38540–44 years, male: 18,40340–44 years, female: 19,28135–39 years, male: 19,50835–39 years, female: 19,36030–34 years, male: 17,81130–34 years, female: 17,83325–29 years, male: 18,15425–29 years, female: 17,70620–24 years, male: 18,98220–24 years, female: 18,44615–19 years, male: 21,36115–19 years, female: 20,36910–14 years, male: 21,14210–14 years, female: 18,7075–9 years, male: 17,5845–9 years, female: 18,3920–4 years, male: 16,3420–4 years, female: 15,98485+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–410K10K20K20K

Hover or tap an age group to see exact counts. Use the up and down arrow keys to inspect age groups.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101

Race and ethnicity

Tap a square or a group below to highlight it.

Each square is about 1% of residents (roughly 6,454 people).

Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002

Monmouth County Income

$124,845median household income

Median household income

$124,845

Half of households earn more, half earn less

Median earnings

$75,260

Typical yearly pay for a worker 25 or older.

Poverty rate

6.5%

About 1 in 15 residents

U.S. Census Bureau, 2024 ACS 5-year estimates · Tables S1901, S1501, S1701

Monmouth County Marital Status

54% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married54%57%51%
Never married31%34%28%
Divorced8%6%10%
Widowed6%2%9%
Separated1%1%1%

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201

Sources

8 sources, all from the U.S. Census Bureau

Population

American Community Survey, 2024 5-year