Plain

Residential delivery area · New Jersey

ZIP Code 08831: Monroe Township, NJ

ZIP code 08831 uses the postal name Monroe Township, New Jersey and lies entirely in Middlesex County (Census 2020 ZIP-county file). About 56,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $109,042 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Forsgate (2%), Jamesburg (2%), Clearbrook (2%), Concordia (2%), Regency at Monroe (1%), Rossmoor (1%), Whittingham (1%), Stonebridge (under 1%), Monroe Manor (under 1%), Encore at Monroe (under 1%), The Ponds (under 1%) and Renaissance at Monroe (under 1%); 87% is outside any Census place.

  • ACS2020-24
  • Census2020
  • FHFA2025
  • ZBP2023
  • IRS2022
0national area: New Jersey, Connecticut, Massachusetts, Maine, New Hampshire and 5 more
088sectional center: Dv Daniels, NJ (SCF 070)
31delivery area within it
Town
Monroe Township · its only residential ZIP
Census places
Forsgate (2%) census-designated place; Jamesburg (2%); Clearbrook (2%) census-designated place; Concordia (2%) census-designated place
Metro area
New York-Newark-Jersey City, NY-NJ
House district
NJ-12 119th Congress
Time zone
Eastern
Land area
51.3 sq mi · 1,085 people per sq mi

Where is ZIP code 08831?

08831 centers on 40.334°, -74.433° and covers 51.3 square miles of land plus 0.5 of water. It borders 11 ZIP codes: 08828, 08810, 08884, 08512, 07726, 08816, 08857, 08852, 08535, 08520 and more.

07726 · Englishtown08512 · Cranbury08520 · Hightstown08535 · Millstone Township08810 · Dayton08816 · East Brunswick08828 · Helmetta08852 · Monmouth Junction08857 · Old Bridge08884 · Spotswood08902 · North Brunswick08831 · Monroe Township (this ZIP)08831077260853508857088160851208520088520890208810088840882807726 · Englishtown08512 · Cranbury08520 · Hightstown08535 · Millstone Township08810 · Dayton08816 · East Brunswick08828 · Helmetta08852 · Monmouth Junction08857 · Old Bridge08884 · Spotswood08902 · North Brunswick08831 · Monroe Township (this ZIP)088310772608535088570881608512085200885208902088100888407726 · Englishtown08512 · Cranbury08520 · Hightstown08535 · Millstone Township08810 · Dayton08816 · East Brunswick08828 · Helmetta08852 · Monmouth Junction08857 · Old Bridge08884 · Spotswood08902 · North Brunswick08831 · Monroe Township (this ZIP)0883107726085350885708816085120852008852089020881008884
Shaded by median household income, in national fifths (ACS 2020-2024); 08831 outlined. Census 2020 ZCTA boundaries. <$54.1k$98.1k+no figure

The map draws ZIP code areas only. For the streets inside 08831, open its center on OpenStreetMap.

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).

How does 08831 compare with the rest of Middlesex County?

Rank of 08831 among the residential ZIP codes of its town, county and state (1 = the most; income and home value among ZIP codes of 1,000+ people living in households)
Measure08831In Middlesex CountyIn NJ
People (ACS 2020-2024)55,6584th of 4220th of 598
Median household income$109k24th of 40262nd of 476
Median home value$517k10th of 40200th of 515

Its median household income is higher than in 86% of U.S. residential ZIP codes, and it is denser than 79% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).

How many people live in 08831?

The 2020 Census counted 55,123 people in 08831; the ACS, which samples households over 2020-2024, estimates 55,658. Between the 2010 and 2020 censuses its population grew 20.8% (its boundary stayed at least 90% the same).

People, ACS 2020-2024
55,658
2020 Census count
55,123+20.8% since 2010 (45,620)
Households
24,083
Median age
54.8

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).

Who lives in 08831?

Of the 55,658 people the ACS estimates in 08831, 17.6% are under 18 and 36.3% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (59.7%), then Asian (not Hispanic) (25.2%).

  • Under 1817.6%
  • 18 to 6446.1%
  • 65 and older36.3%
Age of the people of 08831 (ACS 2020-2024, B01001)
  • White, not Hispanic59.7%
  • Asian, not Hispanic25.2%
  • Hispanic or Latino10.4%
  • Black, not Hispanic2.4%
  • Other or two or more2.3%
Race and Hispanic origin in 08831 (ACS 2020-2024, B03002); each person counted once

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.

What do households in 08831 earn?

Median household income is $109,042 (ACS 2020-2024), the 24th highest of the 40 ranked ZIP codes in Middlesex County. It is not measurably different from 2015-2019 ($109,608 in 2024 dollars): the change is within the surveys' margins of error.

Median household income
$109,042±$11,268
Income per person
$67,012
Below the poverty line
3.6%
Unemployed (of the labor force)
5.1%
Adults 25+ with a bachelor's degree
51.8%
Adjusted gross income per tax return, 2022
$132,87230,230 returns; wages 61% of AGI (IRS)

Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).

What are homes worth in 08831?

FHFA's house price index for 08831, built from repeat sales and appraisals of the same homes, rose 76% from 2015 to 2025 and rose 59% from 2020 to 2025, and moved +5.1% in 2025.

Median home value (owners' estimate)
$516,800
Median gross rent
$2,014
Homes owned by their occupants
89.6%
Housing units
24,806
0 200 400 600 800 197919902000201020202025 0 200 400 600 800 197919902000201020202025 0 200 400 600 800 197919902000201020202025
Index = 100 in 1979, the first year FHFA reports for 08831; 2025: 900.5. Annual, not seasonally adjusted; FHFA calls its ZIP-level indexes developmental.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.

What businesses are in 08831?

1,134 business establishments had a location in this ZIP code in 2023, 70 more than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).

  • Professional, scientific, and technical services245
  • Health care and social assistance152
  • Construction109
  • Wholesale trade87
  • Other services (except public administration)87
  • Retail trade84

Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).

Which ZIP codes are next to 08831?

ZIP codes that share a boundary with 08831, then the nearest by center
ZIPTownPeopleHousehold incomeDistance
08828Helmetta2,459$99k3.1 mi
08810Dayton7,952$152k3.9 mi
08884Spotswood8,187$105k4.6 mi
08512Cranbury12,928$119k4.9 mi
07726Englishtown44,764$149k5.8 mi
08816East Brunswick49,360$144k6.6 mi
08857Old Bridge40,891$109k6.7 mi
08852Monmouth Junction18,062$133k7.0 mi
08535Millstone Township4,999$210k7.1 mi
08520Hightstown29,504$118k7.7 mi
08902North Brunswick43,932$121k8.0 mi

Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.