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US ZIP Code Profile

ZIP Code 08638
Trenton, New Jersey

ZIP code 08638 is in Trenton, located in Mercer County, New Jersey, within the Trenton metro area. Its 2020 Census population was 23,548. The estimated median adjusted gross income per tax return is $40,998, and about 2% of filers report $200,000 or more.

2020 Population
23,548
Census ZCTA
County
Mercer
FIPS 34021
Median income (est.)
$40,998
IRS SOI 2022
Land Area
5.756 mi²
+ 0.026 mi² water

01Location & Geography

Authoritative geographic identifiers from the U.S. Census Bureau, ANSI, and FIPS standards.

Primary CityTrenton, NJ
CountyMercer County (FIPS 34021)
StateNew Jersey (FIPS 34)
Metro Area (MSA)Trenton, NJ Metro Area (45940)
Census Region / DivisionNortheast Region · Middle Atlantic Division
Coordinates40.254017, -74.76338
Land / Water Area5.756 mi² land · 0.026 mi² water

02Income & Economics

Distribution of the 11,590 individual tax returns filed in 08638 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
32.4%
$25K–$50K
27.4%
$50K–$75K
17.1%
$75K–$100K
8.9%
$100K–$200K
11.7%
$200K+
2.4%
The $200,000+ bracket accounts for 14% of 08638's total adjusted gross income, from 2% of returns — a concentration that drives the gap between the median ($40,998) and the average.
Estimated median = median adjusted gross income per tax return, interpolated from IRS SOI brackets. Differs from U.S. Census household income.

03Income Over Time

Year-over-year change in 08638's IRS income metrics, 2020–2022.

Median income (2021→2022)
$40,998
▲ 1.7%
Filers earning $200K+
2.4%
▲ 0.2 pt
Total filers
11,590
▲ 2.8%
GET /zipc/v2/zipcodes/08638/soi?year=… $37K 2020 $40K 2021 $41K 2022
Median = adjusted gross income per return, interpolated from IRS SOI brackets. Figures are nominal (not inflation-adjusted).

04Population Trend

Decennial U.S. Census population for the 08638 ZCTA.

2000
26,120
 
2010
22,832
▼ -12.6%
2020
23,548
▲ +3.1%

05Nearby ZIP Codes — Live Radius Search

Drag the slider to filter ZIP codes by distance from 08638. Powered by the same radius endpoint developers call from the API.

GET /zipc/v2/radius

ZIP codes within range of 08638

Trenton and its immediate neighbors, sorted by distance.

3 mi
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Distance from 08638 to any ZIP

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06USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortB
USPS Finance Number338550
City AliasesEwing, Ewing Township, Ewing Twp, Trenton

07Frequently Asked Questions

What county is ZIP code 08638 in?

ZIP code 08638 is in Mercer County, New Jersey (county FIPS code 34021).

What city is ZIP code 08638?

The primary USPS city for 08638 is Trenton, NJ.

What metro area (MSA) is 08638 in?

08638 is part of the Trenton, NJ Metro Area (MSA code 45940).

What is the population of ZIP code 08638?

The 2020 Census population of 08638 was 23,548 residents.

What is the median income in ZIP code 08638?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 08638 is about $40,998, with around 2% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.