Residential delivery area · New Jersey
ZIP Code 08558: Skillman, NJ
ZIP code 08558 uses the postal name Skillman, New Jersey and lies mostly in Somerset County (95% of its land) with the rest in Mercer County (Census 2020 ZIP-county file). About 7,600 people live there (Census Bureau, ACS 2020-2024). Median household income is $236,016 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Skillman (9%) and Blawenburg (4%); 87% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Skillman · its only residential ZIP
- County
- Somerset County (95%); Mercer County (5%)
- Census places
- Skillman (9%) census-designated place; Blawenburg (4%) census-designated place
- Metro area
- New York-Newark-Jersey City, NY-NJ
- House district
- NJ-12 119th Congress
- State
- New Jersey
- Time zone
- Eastern
- Land area
- 15.6 sq mi · 491 people per sq mi
Where is ZIP code 08558?
08558 centers on 40.413°, -74.704° and covers 15.6 square miles of land plus 0.1 of water. It borders 5 ZIP codes: 08553, 08502, 08525, 08540, 08844.
The map draws ZIP code areas only. For the streets inside 08558, 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 08558 compare with the rest of Somerset County?
| Measure | 08558 | In Somerset County | In NJ |
|---|---|---|---|
| People (ACS 2020-2024) | 7,648 | 19th of 32 | 364th of 598 |
| Median household income | $236k | 3rd of 24 | 17th of 476 |
| Median home value | $910k | 3rd of 25 | 37th of 515 |
Its median household income is higher than in more than 99% of U.S. residential ZIP codes, and it is denser than 72% 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 08558?
The 2020 Census counted 7,754 people in 08558; the ACS, which samples households over 2020-2024, estimates 7,648. Between the 2010 and 2020 censuses its population grew 17.0% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 7,648
- 2020 Census count
- 7,754+17.0% since 2010 (6,629)
- Households
- 2,767
- Median age
- 47.5
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 08558?
Of the 7,648 people the ACS estimates in 08558, 23.8% are under 18 and 20.6% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (57.7%), then Asian (not Hispanic) (26.8%).
- Under 1823.8%
- 18 to 6455.5%
- 65 and older20.6%
- White, not Hispanic57.7%
- Asian, not Hispanic26.8%
- Hispanic or Latino5.8%
- Black, not Hispanic5.7%
- Other or two or more4.0%
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 08558 earn?
Median household income is $236,016 (ACS 2020-2024), the 3rd highest of the 24 ranked ZIP codes in Somerset County. It is not measurably different from 2015-2019 ($258,505 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $236,016±$33,120
- Income per person
- $112,991
- Below the poverty line
- 1.3%
- Unemployed (of the labor force)
- 2.5%
- Adults 25+ with a bachelor's degree
- 79.3%
- Adjusted gross income per tax return, 2022
- $300,8203,720 returns; wages 64% 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 08558?
FHFA's house price index for 08558, built from repeat sales and appraisals of the same homes, rose 56% from 2015 to 2025 and rose 50% from 2020 to 2025, and moved +6.6% in 2025.
- Median home value (owners' estimate)
- $910,200
- Median gross rent
- $2,000
- Homes owned by their occupants
- 86.2%
- Housing units
- 2,789
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 08558?
258 business establishments had a location in this ZIP code in 2023, 6 fewer than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services63
- Health care and social assistance29
- Administrative and support and waste management and remediation services24
- Other services (except public administration)21
- Retail trade19
- Construction18
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 08558?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 08553 | Rocky Hill | 819 | $148k | 3.5 mi |
| 08502 | Belle Mead | 11,849 | $227k | 3.6 mi |
| 08525 | Hopewell | 4,522 | $165k | 4.1 mi |
| 08540 | Princeton | 50,388 | $177k | 4.2 mi |
| 08844 | Hillsborough | 44,463 | $154k | 6.1 mi |
| 08542 | Princeton | 2,533 | $106k | 4.7 mi (near) |
| 08528 | Kingston | 321 | – | 4.8 mi (near) |
| 08544 | Princeton | 4,392 | – | 5.2 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.