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 — ZIP/45018

45018

ZIP 45018 is in Fairfield, Ohio, in Butler County; Eastern time. Fairfield has 2 ZIP codes; the other is 45014.

Type
No street area
Time zone
America/New_York
County
Butler
Coordinates
39.4410, -84.5757

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 45013, whose figures describe that area — not this ZIP code.

☼ Live from 45018 — Fairfield, OH

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Where 45018 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 45018
  • 🔢 Type 45018 into a pocket calculator and turn it upside down: BIOSh — not quite a word, sorry.
  • ➕ As a number, 45,018 = 2 × 3 × 3 × 41 × 61. Its digits add up to 18, a total 2,332 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1010111111011010
  • 🏠 Its numerical neighbours: 45015 (Hamilton, OH, 5 mi away) and 45030 (Harrison, OH, 16 mi away).
  • 🔄 Backwards, 45018 becomes 81054 — and that is a real ZIP code: Las Animas, CO, 1,008 miles away.
  • 👥 59 other ZIP codes are made of exactly the same digits (01845, 01854, 04851, 05148, 05481, 05841, …). The farthest-flung twin is 85041 in Phoenix, AZ, 1,580 miles away.
  • 🧭 Farther north than 52% of all ZIP codes, and farther east than 58%.
  • 🎯745 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 45018 and you would come out at 39.44°S, 95.42°E — 1,254 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 57m of daylight. Shortest: 9h 23m.
🌙 The sky over 45018 today
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Source: USGS.

Business and tax activity

Business establishments8This ZIP8
Employees72This ZIP72
Annual payroll$2,940,000This ZIP$2,940,000

Land area

ZIP codes near 45018

ZIPCityDistance
45012 Hamilton, OH 0.0 mi
45062 Seven Mile, OH 3.1 mi
45055 Overpeck, OH 3.6 mi
45011 Hamilton, OH 4.3 mi
45013 Hamilton, OH 4.5 mi
45015 Hamilton, OH 4.7 mi
45004 Collinsville, OH 5.4 mi
45067 Trenton, OH 6.3 mi
45014 Fairfield, OH 8.1 mi
45064 Somerville, OH 9.2 mi

Find every ZIP code within 10 miles of 45018 →

Questions about this ZIP code

Where is ZIP code 45018?

45018 is in Fairfield, Ohio, in Butler County, part of the Cincinnati, OH-KY-IN metropolitan area. Its published point location is 39.4410, -84.5757.

What county is 45018 in?

45018 lies in Butler County.

What time zone is 45018 in?

45018 uses America/New_York.

What ZIP codes are near 45018?

The closest are 45012 (0 mi), 45062 (3.1 mi), 45055 (3.6 mi), 45011 (4.3 mi) and 45013 (4.5 mi).

Is 45018 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. “45018 ZIP Code — Fairfield, Ohio (Butler County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/45018

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/45018.json

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