Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — STATE/NJ/COUNTY/WARREN

Warren County, NJ ZIP codes

There are 18 ZIP codes in Warren County, NJ, in 18 towns, from 07820 to 08886. The largest are 07840 (Hackettstown), 08865 (Phillipsburg) and 07882 (Washington).

The county seat is Belvidere.

ZIP codes
18
Towns
18
County seat
Belvidere
County FIPS
34041
Population
110,849
Median household income
$100,869
Land area
357 sq mi
Area code
908

Warren County ZIP codes by town

Belvidere (county seat)
07823

Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.

Map of Warren County ZIP codes

078200782307825078290783107832078330783807840078440784607863078650788007882088080886508886

The ZIP codes of Warren County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Warren County in numbers

About 110,849 people live in Warren County, in 45,391 households, the 19th most populous of New Jersey's 21 counties. The median household income is $100,869 a year, about the same as the New Jersey median of $103,556 (US: $80,734). The median owner-occupied home is valued at $346,500 (24% below the New Jersey median), and median gross rent is $1,409 a month. The median age is 44.0; 36.5% of adults 25 and over hold a bachelor's degree or higher (43.6% across New Jersey); the average commute takes 34 minutes.

Population110,849Warren110,849
Households45,391Warren45,391
Median age44.0Warren44.0New Jersey40.1US 38.9
Median household income$100,869Warren$100,869New Jersey$103,556US $80,734
Median home value$346,500Warren$346,500New Jersey$454,400US $332,700
Median gross rent$1,409Warren$1,409New Jersey$1,720US $1,413
Bachelor's degree or higher36.5%Warren36.5%New Jersey43.6%US 35.7%
Mean commute34.0 minWarren34.0 minNew Jersey30.5 minUS 26.4 min
Population density311 / sq miWarren311 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.

Largest towns in Warren County

Largest towns in Warren County
TownZIP codesPopulation
Phillipsburg 1 15,299
Hackettstown 1 10,140
Washington 1 7,334
Belvidere 1 2,538
Oxford 1 1,122
Vienna 1 999
Stewartsville 1 710
Great Meadows 1 604
Johnsonburg 1 406
Blairstown 1 344
Buttzville 1 198
Hope 1 185
Columbia 1 174
Port Murray 1 138
Broadway 1 115

Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.

Neighbouring counties

Counties that share a ZIP code with Warren County.

Not sure you are in Warren County? What county am I in? answers from your location, near a county line included.

Every ZIP code in Warren County, with figures

ZIP codes in Warren County
ZIP City Type Population Median income Median home
07820 Allamuchy , NJ Standard 0 — —
07823 Belvidere , NJ Standard 7,451 $85,522 $322,000
07825 Blairstown , NJ Standard 9,210 $123,785 $423,400
07829 Buttzville , NJ No street area — — —
07831 Changewater , NJ Standard 36 — —
07832 Columbia , NJ Standard 3,593 $106,424 $355,200
07833 Delaware , NJ Standard 70 — $210,000
07838 Great Meadows , NJ Standard 3,727 $121,599 $440,100
07840 Hackettstown , NJ Standard 32,105 $105,866 $396,100
07844 Hope , NJ Standard 111 $80,221 —
07846 Johnsonburg , NJ Standard 45 $99,792 $408,300
07863 Oxford , NJ Standard 3,819 $94,167 $294,000
07865 Port Murray , NJ Standard 2,825 $108,056 $394,300
07880 Vienna , NJ Standard 173 — —
07882 Washington , NJ Standard 15,115 $107,567 $354,900
08808 Broadway , NJ No street area — — —
08865 Phillipsburg , NJ Standard 31,427 $79,949 $267,200
08886 Stewartsville , NJ Standard 6,435 $161,168 $447,100

Cite this page

zipcodes.pro. “Warren County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/nj/county/warren

Underlying data is public domain or openly licensed — sources, vintages and licences.