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/59403

59403

ZIP 59403 is in Great Falls, Montana, in Cascade County; area code 406; Mountain time. Great Falls has 5 ZIP codes; the others are 59401, 59404, 59405 and 59406.

Type
No street area
Time zone
America/Denver
County
Cascade
Metro area
Great Falls, MT
Coordinates
47.5002, -111.3008

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 59405, whose figures describe that area — not this ZIP code.

☼ Live from 59403 — Great Falls, MT

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Where 59403 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 59403
  • 🔢 Type 59403 into a pocket calculator and turn it upside down: EOhGS — not quite a word, sorry.
  • ➕ As a number, 59,403 = 3 × 19801. Its digits add up to 21, a total 2,594 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1110100000001011
  • 🏠 Its numerical neighbours: 59402 (Malmstrom Afb, MT, 0 mi away) and 59404 (Great Falls, MT, 9 mi away).
  • 🔄 Backwards, 59403 becomes 30495, which is not a ZIP code at all.
  • 👥 52 other ZIP codes are made of exactly the same digits (04359, 04539, 04935, 04953, 05439, 09354, …). The farthest-flung twin is 09354 in APO AE, a military post office, 4,575 miles away.
  • 🧭 Farther north than 96% of all ZIP codes, and farther west than 86%.
  • 🎯826 miles northwest of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 59403 and you would come out at 47.50°S, 68.70°E — 146 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 58m of daylight. Shortest: 8h 26m.
🌙 The sky over 59403 today
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🌋 Shake report
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Source: USGS.

Business and tax activity

Business establishments51This ZIP51
Employees418This ZIP418
Annual payroll$23,944,000This ZIP$23,944,000

Land area

ZIP codes near 59403

ZIPCityDistance
59402 Malmstrom Afb, MT 0.0 mi
59401 Great Falls, MT 1.3 mi
59414 Black Eagle, MT 2.7 mi
59406 Great Falls, MT 8.8 mi
59404 Great Falls, MT 9.2 mi
59472 Sand Coulee, MT 12.0 mi
59485 Ulm, MT 13.4 mi
59405 Great Falls, MT 14.6 mi
59440 Floweree, MT 16.3 mi
59487 Vaughn, MT 16.9 mi

Find every ZIP code within 10 miles of 59403 →

Questions about this ZIP code

Where is ZIP code 59403?

59403 is in Great Falls, Montana, in Cascade County, part of the Great Falls, MT metropolitan area. Its published point location is 47.5002, -111.3008.

What county is 59403 in?

59403 lies in Cascade County.

What area code is 59403?

Great Falls uses area code 406, from NANPA's telephone records.

What time zone is 59403 in?

59403 uses America/Denver.

What ZIP codes are near 59403?

The closest are 59402 (0 mi), 59401 (1.3 mi), 59414 (2.7 mi), 59406 (8.8 mi) and 59404 (9.2 mi).

Is 59403 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. “59403 ZIP Code — Great Falls, Montana (Cascade County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/59403

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/59403.json

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