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Where 51009 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.
- 🔢 Type 51009 into a pocket calculator and turn it upside down: GOOIS — not quite a word, sorry.
- ➕ As a number, 51,009 = 3 × 7 × 7 × 347. Its digits add up to 15, a total 1,657 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1100011101000001 - 🏠 Its numerical neighbours: 51008 (Brunsville, IA, 37 mi away) and 51010 (Castana, IA, 62 mi away).
- 🔄 Backwards, 51009 becomes 90015 — and that is a real ZIP code: Los Angeles, CA, 1,368 miles away.
- 👥 25 other ZIP codes are made of exactly the same digits (00915, 00951, 01059, 01095, 01509, 01590, …). The farthest-flung twin is 00915 in San Juan, PR, 2,414 miles away.
- 🧭 Farther north than 82% of all ZIP codes, and farther west than 70%.
- 🎯266 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 51009 and you would come out at 42.95°S, 84.45°E — 810 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 15h 21m of daylight. Shortest: 9h 00m.
- 📏 At 0.266 square miles of land, 51009 is bigger than 3% of ZIP codes — about 129 football fields.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 113This ZIP113 |
|---|---|
| Households | 50This ZIP50 |
| Housing units | 57This ZIP57 |
| Median age | 38.3This ZIP38.3Iowa38.6US 38.9 |
| Median household income | $58,750This ZIP$58,750Iowa$75,059US $80,734 |
| Median home value | $83,300This ZIP$83,300Iowa$208,000US $332,700 |
| Bachelor's degree or higher | 21.1%This ZIP21.1% |
| Mean commute | 20.0 minThis ZIP20.0 min |
| Population density | 424.8 / sq miThis ZIP424.8 / sq mi |
Business and tax activity
| Business establishments | 5This ZIP5 |
|---|---|
| Employees | 28This ZIP28 |
| Annual payroll | $2,082,000This ZIP$2,082,000 |
Land area
| Land area | 0.27 sq miThis ZIP0.27 sq mi |
|---|---|
| Water area | 0.00 sq mi |
Other place names in 51009
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 51009
| ZIP | City | Distance |
|---|---|---|
51029 | Larrabee, IA | 4.1 mi |
51058 | Sutherland, IA | 4.9 mi |
51046 | Paullina, IA | 6.5 mi |
51047 | Peterson, IA | 9.2 mi |
51037 | Meriden, IA | 9.5 mi |
51245 | Primghar, IA | 9.5 mi |
51014 | Cleghorn, IA | 13.4 mi |
51012 | Cherokee, IA | 13.8 mi |
51231 | Archer, IA | 14.7 mi |
51022 | Granville, IA | 15.1 mi |
Find every ZIP code within 10 miles of 51009 →
Questions about this ZIP code
Where is ZIP code 51009?
51009 is in Calumet, Iowa, in O'Brien County. Its published point location is 42.9450, -95.5514.
What county is 51009 in?
51009 lies in O'Brien County.
What area code is 51009?
Calumet uses area code 712, from NANPA's telephone records.
What time zone is 51009 in?
51009 uses America/Chicago.
How many people live in 51009?
About 113 people live in ZIP code 51009, in 50 households, at 424.8 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 51009?
$58,750 a year, against $75,059 across Iowa.
What ZIP codes are near 51009?
The closest are 51029 (4.1 mi), 51058 (4.9 mi), 51046 (6.5 mi), 51047 (9.2 mi) and 51037 (9.5 mi).
Is 51009 a PO Box ZIP code?
51009 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “51009 ZIP Code — Calumet, Iowa (O'Brien County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/51009
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/51009.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.