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/51102

51102

ZIP 51102 is in Sioux City, Iowa, in Woodbury County; area code 712; Central time. Sioux City has 9 ZIP codes in all.

Type
No street area
Time zone
America/Chicago
County
Woodbury
Coordinates
42.3684, -96.3180

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 51052, whose figures describe that area — not this ZIP code.

☼ Live from 51102 — Sioux City, IA

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Where 51102 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 51102
  • 🔢 Type 51102 into a pocket calculator and turn it upside down: ZOIIS — not quite a word, sorry.
  • ➕ As a number, 51,102 = 2 × 3 × 3 × 17 × 167. Its digits add up to 9, a total 375 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1100011110011110
  • 🏠 Its numerical neighbours: 51101 (Sioux City, IA, 9 mi away) and 51103 (Sioux City, IA, 12 mi away).
  • 🔄 Backwards, 51102 becomes 20115 — and that is a real ZIP code: Marshall, VA, 995 miles away.
  • 👥 37 other ZIP codes are made of exactly the same digits (01152, 01521, 02115, 02151, 10125, 10152, …). The farthest-flung twin is 02151 in Revere, MA, 1,287 miles away.
  • 🧭 Farther north than 78% of all ZIP codes, and farther west than 72%.
  • 🎯211 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 51102 and you would come out at 42.37°S, 83.68°E — 806 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 17m of daylight. Shortest: 9h 04m.
🌙 The sky over 51102 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments38This ZIP38
Employees837This ZIP837
Annual payroll$64,276,000This ZIP$64,276,000

Land area

ZIP codes near 51102

ZIPCityDistance
51054 Sergeant Bluff, IA 1.2 mi
51052 Salix, IA 4.9 mi
51111 Sioux City, IA 5.2 mi
51106 Sioux City, IA 6.6 mi
51007 Bronson, IA 7.0 mi
68030 Homer, NE 8.1 mi
68776 South Sioux City, NE 9.0 mi
68731 Dakota City, NE 9.3 mi
51101 Sioux City, IA 9.5 mi
51105 Sioux City, IA 9.9 mi

Find every ZIP code within 10 miles of 51102 →

Questions about this ZIP code

Where is ZIP code 51102?

51102 is in Sioux City, Iowa, in Woodbury County, part of the Sioux City, IA-NE-SD metropolitan area. Its published point location is 42.3684, -96.3180.

What county is 51102 in?

51102 lies in Woodbury County.

What area code is 51102?

Sioux City uses area code 712, from NANPA's telephone records.

What time zone is 51102 in?

51102 uses America/Chicago.

What ZIP codes are near 51102?

The closest are 51054 (1.2 mi), 51052 (4.9 mi), 51111 (5.2 mi), 51106 (6.6 mi) and 51007 (7 mi).

Is 51102 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. “51102 ZIP Code — Sioux City, Iowa (Woodbury County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/51102

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curl https://zipcodes.pro/zip/51102.json

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