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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 — ZIP/08870

08870

ZIP 08870 is Readington, New Jersey, in Hunterdon County; area code 908; Eastern time.

Type
No street area
Time zone
America/New_York
County
Hunterdon
Coordinates
40.5687, -74.7377

The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

This ZIP code has no Census tabulation area of its own. Its point falls inside ZCTA 08889, whose figures describe that area — not this ZIP code.

☼ Live from 08870 — Readington, NJ

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Where 08870 is

This ZIP code has no Census tabulation area, so there is no boundary to draw — the marker is its published point location.

★ Weird and wonderful facts about 08870
  • 🔢 Type 08870 into a pocket calculator and turn it upside down: OLBBO — not quite a word, sorry.
  • ➕ As a number, 8,870 = 2 × 5 × 887. Its digits add up to 23, a total 2,533 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10001010100110
  • 🏠 Its numerical neighbours: 08869 (Raritan, NJ, 5 mi away) and 08871 (Sayreville, NJ, 19 mi away).
  • 🔄 Backwards, 08870 becomes 07880 — and that is a real ZIP code: Vienna, NJ, 23 miles away.
  • 👥 10 other ZIP codes are made of exactly the same digits (07088, 07880, 08078, 08087, 08807, 70808, …). The farthest-flung twin is 88007 in Las Cruces, NM, 1,866 miles away.
  • 🧭 Farther north than 62% of all ZIP codes, and farther east than 88%.
  • 🎯1,255 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 08870 and you would come out at 40.57°S, 105.26°E — 837 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 05m of daylight. Shortest: 9h 16m.
🌙 The sky over 08870 today
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🌋 Shake report
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Source: USGS.

Business and tax activity

Business establishments12This ZIP12
Employees64This ZIP64
Annual payroll$4,217,000This ZIP$4,217,000

Land area

ZIP codes near 08870

ZIPCityDistance
08853 Neshanic Station, NJ 2.9 mi
08889 Whitehouse Station, NJ 2.9 mi
08876 Somerville, NJ 3.1 mi
08888 Whitehouse, NJ 3.5 mi
08821 Flagtown, NJ 4.2 mi
08887 Three Bridges, NJ 4.5 mi
08869 Raritan, NJ 4.8 mi
08885 Stanton, NJ 4.9 mi
08844 Hillsborough, NJ 6.0 mi
08807 Bridgewater, NJ 6.4 mi

Find every ZIP code within 10 miles of 08870 →

Questions about this ZIP code

Where is ZIP code 08870?

08870 is in Readington, New Jersey, in Hunterdon County, part of the New York-Newark-Jersey City, NY-NJ metropolitan area. Its published point location is 40.5687, -74.7377.

What county is 08870 in?

08870 lies in Hunterdon County.

What area code is 08870?

Readington uses area code 908, from NANPA's telephone records.

What time zone is 08870 in?

08870 uses America/New_York.

What ZIP codes are near 08870?

The closest are 08853 (2.9 mi), 08889 (2.9 mi), 08876 (3.1 mi), 08888 (3.5 mi) and 08821 (4.2 mi).

Is 08870 a PO Box ZIP code?

Possibly. The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

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Cite this page

zipcodes.pro. “08870 ZIP Code — Readington, New Jersey (Hunterdon County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/08870

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/08870.json

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