Monroe Township, NJ · standard
ZIP Code 08831
Middlesex County, New Jersey - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.
- 45,620
- 350/sq mi High-density area
- $109,042
- Median income Above-median income area
- $516,800
- Median home value Above-median home value
- 51.8%
- Bachelor's or higher Above-average bachelor's attainment
National ZIP placement
Monroe Township pairs an upper-quartile household income with upper-quartile home values, in a low-density, homeowner-dominated area.
- Top 14%
- household income, US ZIPs
- Top 12%
- home value, US ZIPs
- 350
- people per sq mi
- 90%
- owner-occupied homes
Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 08831 against every reporting US ZIP.
FHFA HPI release change
What changed in the latest House Price Index year
- FHFA House Price Index values in ZIP 08831 (Monroe Township, NJ) rose +15.0% from 2023 to 2024. The all-transactions index moved from 242.0 in 2023 to 278.3 in 2024 (2000 = 100).
ZIP code 08831 is a densely settled ZIP (a standard USPS delivery area) in Monroe Township, Middlesex County, New Jersey, with 45,620 residents across 130.3 square miles, a density of 350 people per square mile, in the New York time zone.
ZIP 08831 lands in the middle-income range, with a median household income of $109,042 (11% below the average New Jersey ZIP), while per-capita income is $67,012. The poverty rate is 3.6%, with unemployment at 5.1%; those measures add context to the income figure. Median home value is $516,800 (0% above the average New Jersey ZIP) and median rent is $2,014; 89.6% of occupied homes are owner-occupied.
This is a highly-educated ZIP: 51.8% of adults hold a bachelor's degree or higher, the median age is 54.8, and the average commute is 38 minutes. The page also surfaces 10 ZIP codes within roughly 10 miles and 6 more in Middlesex County, so 08831 can be compared with both its immediate and county-level context.
Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →
Top industries in ZIP 08831
Top 5 sectors by establishment count in Monroe Township, NJ
Which industries have the most business establishments in ZIP 08831.
- Professional, scientific, and technical services
Professional, scientific, and technical services
245 establishments
- Health care and social assistance
Health care and social assistance
152 establishments
- Construction
Construction
109 establishments
- Wholesale trade 87
Wholesale trade
87 establishments
- Other services (except public administration) 87
Other services (except public administration)
87 establishments
What this shows Establishment counts come from the Census ZIP Code Business Patterns program, which counts physical business locations rather than employees or revenue.
Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 08831, Monroe Township, NJ · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.
Quick Facts
45,620
Population
130.3
Area (sq mi)
350
People / sq mi
New York
Time Zone
standard
ZIP Type
Who lives in ZIP 08831?
54.8
Median Age
48.4%
Male
51.6%
Female
27.2%
Foreign-Born
Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
How much do residents earn?
$109,042
Median Household Income
-11% vs state ZIP avg
$67,012
Per Capita Income
3.6%
Poverty Rate
5.1%
Unemployment Rate
37.9 min
Mean Commute Time
How ZIP 08831 ranks nationally
Monroe Township, NJ household income vs. every US ZIP code
Median household income, the full national distribution, with this ZIP marked
$109,042 Top 14% higher than 86% of 30,318 US ZIPs
Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What is the education profile here?
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
Housing stock: occupied vs vacant
24,806housing units
24,806
Total Housing Units
24,083
Occupied Units
723
Vacant Units
2.29
Avg Household Size
Occupancy Type
$516,800
Median Home Value
+0% vs state ZIP avg
$2,014
Median Rent
1994
Median Year Built
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
How have home values changed over time?
FHFA House Price Index, annual appreciation data based on repeat sales and appraisals
+15.0%
YoY Change (2024)
278
HPI Index (2000 = 100)
+178%
Total Change Since 2000
Home values in ZIP 08831 have increased 15.0% over the past year (2024). Since 2000, this ZIP has seen +178% cumulative appreciation.
| Year | Annual Change | HPI Index |
|---|---|---|
| 2020 | +2.2% | 184 |
| 2021 | +8.0% | 199 |
| 2022 | +16.0% | 231 |
| 2023 | +5.0% | 242 |
| 2024 | +15.0% | 278 |
Source: Federal Housing Finance Agency (FHFA) House Price Index, All-Transactions, Five-Digit ZIP Codes (Developmental Index). Index base = 100 in year 2000. Data through 2024. ZIP codes with few transactions may show missing values.
What businesses operate in this ZIP?
Census Bureau data shows 1,134 business establishments in ZIP 08831, employing approximately 17,939 people with a combined annual payroll of $1,324,043,000.
1,134
Businesses
17,939
Employees
$1.3B
Annual Payroll
15
Industry Sectors
| Industry | Establishments | % of Total |
|---|---|---|
| Professional, scientific, and technical services | 245 | 21.6% |
| Health care and social assistance | 152 | 13.4% |
| Construction | 109 | 9.6% |
| Wholesale trade | 87 | 7.7% |
| Other services (except public administration) | 87 | 7.7% |
| Retail trade | 84 | 7.4% |
| Accommodation and food services | 81 | 7.1% |
| Transportation and warehousing | 79 | 7.0% |
| Administrative and support and waste management and remediation services | 72 | 6.3% |
| Finance and insurance | 44 | 3.9% |
| Real estate and rental and leasing | 25 | 2.2% |
| Educational services | 18 | 1.6% |
| Arts, entertainment, and recreation | 18 | 1.6% |
| Information | 15 | 1.3% |
| Manufacturing | 14 | 1.2% |
Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.
Nearby ZIP Codes
Want a side-by-side? Compare 08831 vs 08828 →
ZIP 08831 vs its nearest neighbors, by population
Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 08816
East Brunswick (08816)
46,298 residents
- 08831
Monroe Township (08831)
45,620 residents
- 07726
Englishtown (07726)
42,508 residents
- 08512 10,105
Cranbury (08512)
10,105 residents
- 08810 8,401
Dayton (08810)
8,401 residents
- 08850 8,281
Milltown (08850)
8,281 residents
- 08884 8,257
Spotswood (08884)
8,257 residents
- 08535 5,385
Millstone Township (08535)
5,385 residents
- 08510 5,231
Millstone Township (08510)
5,231 residents
What this shows Among its immediate neighbors, ZIP 08831 ranks #2 by population - useful context the national average alone can't give.
ZIP 08831 vs its nearest neighbors, by median income
Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 08510
Millstone Township (08510)
$225,966 median income
- 08535
Millstone Township (08535)
$209,732 median income
- 08810
Dayton (08810)
$151,902 median income
- 07726
Englishtown (07726)
$149,197 median income
- 08816
East Brunswick (08816)
$143,586 median income
- 08850
Milltown (08850)
$141,601 median income
- 08512
Cranbury (08512)
$118,587 median income
- 08555
Roosevelt (08555)
$110,000 median income
- 08831
Monroe Township (08831)
$109,042 median income
What this shows By household income, ZIP 08831 ranks #9 of 9 neighboring ZIPs, local affluence varies block to block, not just metro to metro.
| ZIP Code | City | Population | Distance |
|---|---|---|---|
| 08828 | Helmetta, NJ | 2,178 | 3.5 mi |
| 08535 | Millstone Township, NJ | 5,385 | 6.3 mi |
| 08512 | Cranbury, NJ | 10,105 | 5.1 mi |
| 08884 | Spotswood, NJ | 8,257 | 5.1 mi |
| 08810 | Dayton, NJ | 8,401 | 4.6 mi |
| 08816 | East Brunswick, NJ | 46,298 | 7.1 mi |
| 08850 | Milltown, NJ | 8,281 | 8.4 mi |
| 07726 | Englishtown, NJ | 42,508 | 5.5 mi |
| 08510 | Millstone Township, NJ | 5,231 | 9.4 mi |
| 08555 | Roosevelt, NJ | 877 | 7.7 mi |
Nationwide ZIPs with similar ACS profiles
Two Census-derived peer sets for ZIP 08831, both outside NJ so the neighborhoods are not geographic containment (Nearby and same-county blocks stay local).
Similar population
Nearest cross-state ZIPs by resident population (45,620 here; floor ≥1,000).
Similar median household income
Nearest cross-state ZIPs by ACS median household income.
More ZIP Codes in Middlesex County
Related Areas
Frequently Asked Questions
What county is ZIP code 08831 in?
ZIP code 08831 (Monroe Township) is located in Middlesex County, New Jersey. Middlesex County contains multiple ZIP codes, see the full list at /counties/middlesex-nj.
What is the population of ZIP code 08831?
ZIP code 08831 in Monroe Township, NJ has a population of 45,620 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 08831?
The median household income in ZIP 08831 is $109,042, which is 43% above the national average of $76,288.
What is the average home value in ZIP 08831?
The median home value in ZIP 08831 is $516,800, which is 86% above the national average of $278,155.
What is the demographic makeup of ZIP 08831?
The largest racial group in ZIP 08831 is White at 63.8%. Hispanic or Latino residents make up 10.4% of the population.
How many businesses are in ZIP code 08831?
ZIP code 08831 has 1,134 business establishments employing approximately 17,939 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 08831?
The top industries by establishment count in ZIP 08831 are: Professional, scientific, and technical services (245), Health care and social assistance (152), Construction (109). There are 15 industry sectors represented in total.
How have home values changed in ZIP code 08831?
According to the FHFA House Price Index, home values in ZIP 08831 increased by 15.0% in 2024. Since 2000, home values in this ZIP have appreciated by approximately 178%. This is a developmental index based on repeat sales and appraisal data from Fannie Mae and Freddie Mac.
What is the education level in ZIP code 08831?
In ZIP code 08831, 73.6% of residents aged 25+ have a high school diploma or higher, and 51.8% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What is the average commute time in ZIP 08831?
The mean commute time for workers in ZIP code 08831 is 37.9 minutes according to Census ACS data. The national average is roughly 26 minutes, so commuters here spend more time traveling to work than typical.
What percentage of residents own vs. rent in ZIP 08831?
In ZIP code 08831, approximately 89.6% of occupied housing units are owner-occupied and 10.4% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 08831?
The poverty rate in ZIP code 08831 is 3.6% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.
Related
Take this with you
What to do with ZIP 08831's numbers, next.
- See how ZIP 08831 compares to a neighboring ZIP code on the same Census fields Compare this ZIP
- Check where Monroe Township, NJ ranks among every U.S. ZIP code on income, education, or homeownership View national rankings
- Save this ZIP to your shortlist to track alongside others you're considering View your shortlist
ZIP Code Tabulation Areas (ZCTAs) are Census Bureau approximations of USPS ZIP codes; figures describe the ZCTA area, not any single address within it.