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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/51340

51340

ZIP 51340 is Fostoria, Iowa, in Clay County; area code 712; Central time.

Type
Standard
Time zone
America/Chicago
County
Clay
Metro area
Spencer, IA
Population
75
Coordinates
43.2405, -95.1561
☼ Live from 51340 — Fostoria, IA

Weather right now

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Local time: —

Where 51340 is

Approximate ZIP boundary (Census ZCTA 2020). ZIP codes are mail routes, not areas, so the shape shown is the Census tabulation area that approximates it.

★ Weird and wonderful facts about 51340
  • 🔢 Type 51340 into a pocket calculator and turn it upside down: OhEIS — not quite a word, sorry.
  • ➕ As a number, 51,340 = 2 × 2 × 5 × 17 × 151. Its digits add up to 13, a total 1,179 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1100100010001100
  • 🏠 Its numerical neighbours: 51338 (Everly, IA, 9 mi away) and 51341 (Gillett Grove, IA, 17 mi away).
  • 🔄 Backwards, 51340 becomes 04315, which is not a ZIP code at all.
  • 👥 64 other ZIP codes are made of exactly the same digits (01354, 01453, 01534, 01543, 03451, 04351, …). The farthest-flung twin is 34051 in FPO AA, a military post office, 2,437 miles away.
  • 🧭 Farther north than 84% of all ZIP codes, and farther west than 69%.
  • 🎯295 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 51340 and you would come out at 43.24°S, 84.84°E — 814 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 23m of daylight. Shortest: 8h 58m.
  • 📏 At 0.120 square miles of land, 51340 is bigger than 2% of ZIP codes — about 58 football fields.
🌙 The sky over 51340 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population75This ZIP75
Households37This ZIP37
Housing units39This ZIP39
Median age46.9This ZIP46.9Iowa38.6US 38.9
Median household income$90,250This ZIP$90,250Iowa$75,059US $80,734
Median home value$133,800This ZIP$133,800Iowa$208,000US $332,700
Bachelor's degree or higher17.6%This ZIP17.6%
Mean commute19.1 minThis ZIP19.1 min
Population density625.0 / sq miThis ZIP625.0 / sq mi

Business and tax activity

Business establishments5This ZIP5
Employees21This ZIP21
Annual payroll$1,530,000This ZIP$1,530,000

Land area

Land area0.12 sq miThis ZIP0.12 sq mi
Water area0.00 sq mi

Other place names in 51340

Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.

ZIP codes near 51340

ZIPCityDistance
51351 Milford, IA 5.3 mi
51301 Spencer, IA 6.0 mi
51331 Arnolds Park, IA 8.3 mi
51338 Everly, IA 8.5 mi
51355 Okoboji, IA 10.3 mi
51364 Terril, IA 10.5 mi
51333 Dickens, IA 10.6 mi
51360 Spirit Lake, IA 13.8 mi
51357 Royal, IA 14.0 mi
51347 Lake Park, IA 15.0 mi

Find every ZIP code within 10 miles of 51340 →

Questions about this ZIP code

Where is ZIP code 51340?

51340 is in Fostoria, Iowa, in Clay County, part of the Spencer, IA micropolitan area. Its published point location is 43.2405, -95.1561.

What county is 51340 in?

51340 lies in Clay County.

What area code is 51340?

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

What time zone is 51340 in?

51340 uses America/Chicago.

How many people live in 51340?

About 75 people live in ZIP code 51340, in 37 households, at 625.0 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.

What is the median household income in 51340?

$90,250 a year, against $75,059 across Iowa.

What ZIP codes are near 51340?

The closest are 51351 (5.3 mi), 51301 (6 mi), 51331 (8.3 mi), 51338 (8.5 mi) and 51355 (10.3 mi).

Is 51340 a PO Box ZIP code?

51340 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “51340 ZIP Code — Fostoria, Iowa (Clay County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/51340

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