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/61204

61204

ZIP 61204 is in Rock Island, Illinois, in Rock Island County; area codes 309 and 861; Central time. Rock Island has 3 ZIP codes; the others are 61201 and 61299.

Type
No street area
Time zone
America/Chicago
County
Rock Island
Coordinates
41.5549, -90.6160

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 52806, whose figures describe that area — not this ZIP code.

☼ Live from 61204 — Rock Island, IL

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Where 61204 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 61204
  • 🔢 Type 61204 into a pocket calculator and turn it upside down: hOZIg — not quite a word, sorry.
  • ➕ As a number, 61,204 = 2 × 2 × 11 × 13 × 107. Its digits add up to 13, a total 1,179 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1110111100010100
  • 🏠 Its numerical neighbours: 61201 (Rock Island, IL, 6 mi away) and 61230 (Albany, IL, 24 mi away).
  • 🔄 Backwards, 61204 becomes 40216 — and that is a real ZIP code: Louisville, KY, 344 miles away.
  • 👥 66 other ZIP codes are made of exactly the same digits (01264, 01462, 02461, 02641, 04216, 04261, …). The farthest-flung twin is 04612 in Bernard, ME, 1,137 miles away.
  • 🧭 Farther north than 71% of all ZIP codes, and farther west than 58%.
  • 🎯434 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 61204 and you would come out at 41.55°S, 89.38°E — 1,069 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 11m of daylight. Shortest: 9h 10m.
🌙 The sky over 61204 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments8This ZIP8
Employees28This ZIP28
Annual payroll$2,799,000This ZIP$2,799,000

Land area

ZIP codes near 61204

ZIPCityDistance
52806 Davenport, IA 2.4 mi
52801 Davenport, IA 3.2 mi
52803 Davenport, IA 3.3 mi
52804 Davenport, IA 3.7 mi
52805 Davenport, IA 4.0 mi
52808 Davenport, IA 4.0 mi
52809 Davenport, IA 4.0 mi
52802 Davenport, IA 4.3 mi
61299 Rock Island, IL 4.5 mi
61201 Rock Island, IL 5.7 mi

Find every ZIP code within 10 miles of 61204 →

Questions about this ZIP code

Where is ZIP code 61204?

61204 is in Rock Island, Illinois, in Rock Island County, part of the Davenport-Moline-Rock Island, IA-IL metropolitan area. Its published point location is 41.5549, -90.6160.

What county is 61204 in?

61204 lies in Rock Island County.

What area code is 61204?

Rock Island uses area codes 309 and 861, from NANPA's telephone records.

What time zone is 61204 in?

61204 uses America/Chicago.

What ZIP codes are near 61204?

The closest are 52806 (2.4 mi), 52801 (3.2 mi), 52803 (3.3 mi), 52804 (3.7 mi) and 52805 (4 mi).

Is 61204 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. “61204 ZIP Code — Rock Island, Illinois (Rock Island County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/61204

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/61204.json

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