Monmouth County, New Jersey

Monmouth County population, land area and income

Monmouth County had 647,520 residents in the Census Vintage 2024 estimate, on 468.2 square miles of land. It ranks 6th of 21 in New Jersey by population and 6th by land area. That works out to 1,383.0 people per square mile, 14.4 times the US average of 96.3, and in the top tenth nationally.

The median county-equivalent in New Jersey has 475,515 residents; Monmouth County is somewhat larger.

Its SAIPE 2023 median household income of $117,752 is in the top tenth among 3,143 counties with an estimate.

How Monmouth County's population changed since 2020

Monmouth County gained 4,742 residents between the July 2020 and July 2024 estimates, a rise of 0.7%. That ranks 19th of 21 in New Jersey for growth. The median New Jersey county changed by +2.3%, and the state as a whole by +2.5%.

Since the April 2020 estimates base, Monmouth County recorded 26,440 births and 26,388 deaths, a natural change of +52. Net international migration added +7,409 and net domestic migration, people moving to or from other US counties, came to -3,801. The largest single component was international migration, which added 7,409 people.

Where Monmouth County is

The Census internal point of Monmouth County is at 40.287000, -74.152400. It sits in UTM zone 18N. The map shades New Jersey's 21 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Monmouth County outlined. Dots are towns of 1,000+ people with residents in it.

Towns in Monmouth County

33 incorporated places of 1,000+ people have residents in Monmouth County, 235,474 people together, or 36% of the county. Each figure counts only the part of the town inside Monmouth County; towns marked "part" extend into another county. The largest is Long Branch with 33,214.

Counties bordering Monmouth County

The Census 2024 county adjacency file lists 6 neighbors for Monmouth County, including 2 across a state line. The most populous is Queens County, NY, with 2,316,841 residents. Distances run between Census internal points in a straight line.

• NY

  Queens County, NY

  2,316,841 people

  30 mi NNE

• Middlesex County

  890,119 people

  17 mi NW

• Ocean County

  666,434 people

  30 mi S

• NY

  Richmond County, NY

  498,212 people

  19 mi N

• Burlington County

  475,515 people

  39 mi SW

• Mercer County

  392,138 people

  29 mi W

Distance to Trenton and the nearest big city

Trenton is 32.2 miles W of Monmouth County's internal point in a straight line. The nearest place of 100,000 or more is Elizabeth, NJ (population 140,413), 26.3 miles away. The nearest place of 10,000 or more is Tinton Falls, NJ (population 19,435), 3.3 miles away.

Monmouth County FIPS code

The FIPS code of Monmouth County is 34025: state code 34 for New Jersey plus county code 025. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $117,752.