What city is 08558 in?

08558 is a Skillman, NJ mailing address. By land area, 9% lies inside Skillman and 4% lies inside Blawenburg; the rest is outside any Census-defined city or community.

What is the population of 08558?

About 7,648 people (±631), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 7,754.

What is the median household income in 08558?

$236,016 (±$33,120), 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 08558?

6 USPS carrier routes with 3,164 residential and 219 business mailboxes (3,380 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 08558?

The closest, measured center to center: 08553 (3.5 mi, Rocky Hill borough, NJ), 08502 (3.6 mi, Belle Mead), 08525 (4.1 mi, Hopewell borough, NJ), 08540 (4.2 mi, Princeton, NJ), 08542 (4.7 mi, Princeton, NJ) and 08528 (4.8 mi, Kingston).

08558 ZIP Code, Skillman, NJ

08558 is a ZIP code in Skillman, New Jersey in Somerset County. It covers 16 square miles of land. The closest ZIP codes are 08553, 08502 and 08525. 7,648 people live here in 2,767 households. With about 491 people per square mile it is lightly settled, and most homes are owner-occupied (86%). Median household income is $236,016, well above the New Jersey median of $103,556; the median age is 47.5, older than most ZIP codes.

Quick facts

Mailing city: Skillman, NJ
County: Somerset County
Land area: 16 sq mi
Population: 7,648
Median household income: $236,016
Carrier routes: 6 (3,164 homes)

Key figures

Measure	Value
Residents	7,648
Households	2,767
Median household income	$236,016
Income per person	$112,991
Median age	47.5
Homeowners	86.2%
Median home value	$910,200
Median rent	$2,000
Bachelor's degree or higher	79.3%
Average commute (minutes)	40.3
Households with kids under 18	38.3%
Moved in the past year	3.4%
Below the poverty line	1.3%
Broadband internet	95.3%
Speak a non-English language at home	30.6%

Household income

% of households	Value
<$10K	0.6%
$10–15K	0.0%
$15–25K	0.8%
$25–35K	3.2%
$35–50K	6.6%
$50–75K	6.1%
$75–100K	2.3%
$100–150K	10.3%
$150–200K	9.0%
$200K+	61.0%

Age

% of all residents	Value
<10	9.0%
10–19	17.6%
20–24	5.1%
25–34	4.2%
35–44	9.8%
45–54	17.2%
55–64	16.6%
65–74	7.8%
75+	12.8%

Tenure

% of housing units	Value
Owned, with mortgage	57.3%
Owned outright	28.2%
Rented	13.7%
Vacant	0.8%

Type of building

% of housing units	Value
Detached house	84.0%
Townhome	5.7%
2–4 units	2.8%
5–19 units	0.0%
20+ units	7.5%
Mobile / other	0.0%

Businesses in 08558

258 business establishments with 2,965 employees (ZIP Codes Business Patterns 2023).

Professional, Scientific, and Technical Services: 63
Health Care and Social Assistance: 29
Administrative and Support and Waste Management and Remediation Services: 24
Other Services (except Public Administration): 21
Retail Trade: 19
Construction: 18
Wholesale Trade: 16
Accommodation and Food Services: 15

EDDM carrier routes

08558 has 6 USPS carrier routes with 3,164 residential and 219 business mailboxes. Open the EDDM route map.

Carrier routes in 08558

08558 has 6 USPS carrier routes (6 rural (R)) with 3,164 residential and 219 business mailboxes. Routes range from 445 homes (R095) to 622 homes (R097); the median route has 521 homes. The Census counted 2,767 households in 08558 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	0
250–499	2
500–749	4
750–999	0
1,000–1,499	0
1,500+	0

Best routes in 08558 for…

Most businesses

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

Route R097 — USPS business mailboxes 110, 622 homes
Route R093 — USPS business mailboxes 51, 447 homes
Route R091 — USPS business mailboxes 32, 608 homes
Route R095 — USPS business mailboxes 19, 445 homes
Route R092 — USPS business mailboxes 4, 526 homes

Select these 5 routes on the route map

Every carrier route in 08558

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
R091	Rural	608	32	$200,001+	—	—	—
R092	Rural	526	4	$196,361	—	—	—
R093	Rural	447	51	$200,001+	—	—	—
R095	Rural	445	19	$200,001+	—	—	—
R096	Rural	516	3	$200,001+	—	—	—
R097	Rural	622	110	$200,001+	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 08558 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

08553 — Rocky Hill borough, NJ (3.5 mi)
08502 — Belle Mead CDP, NJ (3.6 mi)
08525 — Hopewell borough, NJ (4.1 mi)
08540 — Princeton, NJ (4.2 mi)
08542 — Princeton, NJ (4.7 mi)
08528 — Kingston CDP, NJ (4.8 mi)
08544 — Princeton, NJ (5.2 mi)
08844 — Hillsborough CDP, NJ (6.1 mi)

Areas that include 08558

Skillman, NJ ZIP codes — 1 ZIP code
Blawenburg, NJ ZIP codes — 1 ZIP code
Somerset County ZIP codes — 32 ZIP codes
New Jersey ZIP code data

Where it ranks

Mail every home in 08558

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) 08558, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 08558 in?: 08558 is a Skillman, NJ mailing address. By land area, 9% lies inside Skillman and 4% lies inside Blawenburg; the rest is outside any Census-defined city or community.
What county is 08558 in?: 08558 is in Somerset County.
What is the population of 08558?: About 7,648 people (±631), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 7,754.
What is the median household income in 08558?: $236,016 (±$33,120), 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 08558?: 6 USPS carrier routes with 3,164 residential and 219 business mailboxes (3,380 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 08558?: The closest, measured center to center: 08553 (3.5 mi, Rocky Hill borough, NJ), 08502 (3.6 mi, Belle Mead), 08525 (4.1 mi, Hopewell borough, NJ), 08540 (4.2 mi, Princeton, NJ), 08542 (4.7 mi, Princeton, NJ) and 08528 (4.8 mi, Kingston).

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