08831 ZIP Code, Monroe Township, NJ

08831 is a ZIP code in Monroe Township, New Jersey in Middlesex County. It covers 51 square miles of land. The closest ZIP codes are 08828, 08810 and 08884. 55,658 people live here in 24,083 households, more than in 9 of every 10 New Jersey ZIP codes. At about 1,085 people per square mile it has suburban density, and most homes are owner-occupied (90%). Median household income is $109,042, close to the New Jersey median of $103,556; the median age is 54.8, older than most ZIP codes.

Quick facts

Key figures

MeasureValue
Residents55,658
Households24,083
Median household income$109,042
Income per person$67,012
Median age54.8
Homeowners89.6%
Median home value$516,800
Median rent$2,014
Bachelor's degree or higher51.8%
Average commute (minutes)37.9
Households with kids under 1823.4%
Moved in the past year5.7%
Below the poverty line3.6%
Broadband internet93.2%
Speak a non-English language at home32.5%

Household income

% of householdsValue
<$10K2.7%
$10–15K2.0%
$15–25K5.7%
$25–35K3.7%
$35–50K8.6%
$50–75K11.3%
$75–100K12.3%
$100–150K16.1%
$150–200K12.9%
$200K+24.7%

Age

% of all residentsValue
<108.5%
10–199.9%
20–243.5%
25–346.0%
35–4410.2%
45–5412.3%
55–6413.4%
65–7417.1%
75+19.2%

Tenure

% of housing unitsValue
Owned, with mortgage49.8%
Owned outright37.6%
Rented9.8%
Vacant2.8%

Type of building

% of housing unitsValue
Detached house61.2%
Townhome26.1%
2–4 units5.3%
5–19 units2.9%
20+ units4.4%
Mobile / other0.0%

Businesses in 08831

1,134 business establishments with 17,939 employees (ZIP Codes Business Patterns 2023).

EDDM carrier routes

08831 has 45 USPS carrier routes with 26,224 residential and 862 business mailboxes. Open the EDDM route map.

Carrier routes in 08831

08831 has 45 USPS carrier routes (28 city (C), 15 rural (R), 2 highway contract (H)) with 26,224 residential and 862 business mailboxes. Routes range from 266 homes (R005) to 1,091 homes (C005); the median route has 562 homes. The Census counted 24,083 households in 08831 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per routeRoutes
1–2490
250–49914
500–74926
750–9994
1,000–1,4991
1,500+0

Best routes in 08831 for…

Most businesses

For B2B offers: office supplies, cleaning, IT, catering and commercial services.

  1. Route R007 — USPS business mailboxes 118, 411 homes
  2. Route R005 — USPS business mailboxes 117, 266 homes
  3. Route C001 — USPS business mailboxes 70, 445 homes
  4. Route C002 — USPS business mailboxes 64, 325 homes
  5. Route C013 — USPS business mailboxes 49, 733 homes

Select these 5 routes on the route map

Every carrier route in 08831

RouteTypeHomesBusinessesEst. median incomeEst. ownersEst. families with kidsEst. moved in past year
C001City44570$126,785———
C002City32564$126,785———
C003City5370$31,661———
C004City4540$200,001+———
C005City1,09127$200,000+———
C006City4950$31,661———
C007City5130$54,681———
C008City40934$55,853———
C009City5960$55,853———
C010City52136$102,948———
C011City62612$126,785———
C012City78816$64,243———
C013City73349$40,335———
C016City7132$64,243———
C019City6060$64,995———
C022City38613$178,368———
C023City4265$200,001+———
C025City4962$178,368———
C026City4703$125,438———
C027City35833$200,001+———
C028City56222$41,677———
C029City6150$41,677———
C032City8063$44,998———
C033City8550$47,908———
C034City7250$51,911———
C035City67643$60,603———
C036City6007$102,948———
C038City51821$67,449———
H100Highway contract8490$115,454———
H101Highway contract7070$200,001+———
R001Rural4480$200,001+———
R002Rural7000$111,360———
R003Rural5159$176,419———
R004Rural7246$200,001+———
R005Rural266117$67,449———
R006Rural63229$200,001+———
R007Rural411118$200,001+———
R008Rural51518$178,368———
R009Rural5344$200,001+———
R010Rural4856$200,001+———
R011Rural5786$200,001+———
R012Rural6910$163,725———
R013Rural5720$111,360———
R014Rural55444$115,454———
R015Rural69843$111,360———

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 08831 on the EDDM route map.

How route demographics are estimated

Mailbox counts come from USPS; demographics are estimates

The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).

How a route gets its figures: the block-group length-share method

We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.

Margins of error

Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.

Different years

USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.

Why some routes show identical figures

Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.

Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Nearby ZIP codes

Areas that include 08831

Where it ranks

Mail every home in 08831

Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.

EDDM guides

ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 08831, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 08831 in?
08831 is a Monroe Township, NJ mailing address. By land area, 2% lies inside Jamesburg, 2% lies inside Forsgate, 2% lies inside Concordia and 1% lies inside Clearbrook; the rest is outside any Census-defined city or community.
What county is 08831 in?
08831 is in Middlesex County.
What is the population of 08831?
About 55,658 people (±324), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 55,123.
What is the median household income in 08831?
$109,042 (±$11,268), compared with $103,556 for New Jersey as a whole. Half the households in the ZIP code earn more and half earn less.
How many carrier routes and mailboxes are in 08831?
45 USPS carrier routes with 26,224 residential and 862 business mailboxes (27,099 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 08831?
The closest, measured center to center: 08828 (3.1 mi, Helmetta borough, NJ), 08810 (3.9 mi, Dayton), 08884 (4.6 mi, Spotswood borough, NJ), 08512 (4.9 mi, Cranbury), 07726 (5.8 mi, Yorketown) and 08816 (6.6 mi).

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.