Weather right now
Asking the National Weather Service…
Where 51535 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 51535 into a pocket calculator and turn it upside down: SESIS — not quite a word, sorry.
- ➕ As a number, 51,535 = 5 × 11 × 937. Its digits add up to 19, a total 2,454 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1100100101001111 - 🏠 Its numerical neighbours: 51534 (Glenwood, IA, 33 mi away) and 51536 (Hancock, IA, 17 mi away).
- 🔄 Backwards, 51535 becomes 53515 — and that is a real ZIP code: Black Earth, WI, 305 miles away.
- 👥 9 other ZIP codes are made of exactly the same digits (15535, 15553, 31555, 35551, 51355, 51553, …). The farthest-flung twin is 31555 in Odum, GA, 977 miles away.
- 🧭 Farther north than 69% of all ZIP codes, and farther west than 69%.
- 🎯205 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 51535 and you would come out at 41.23°S, 84.87°E — 904 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 15h 09m of daylight. Shortest: 9h 12m.
- 📏 At 135.3 square miles of land, 51535 is bigger than 84% of ZIP codes — room for about 103 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 1,697This ZIP1,697 |
|---|---|
| Households | 740This ZIP740 |
| Housing units | 791This ZIP791 |
| Median age | 50.4This ZIP50.4Iowa38.6US 38.9 |
| Median household income | $76,371This ZIP$76,371Iowa$75,059US $80,734 |
| Median home value | $152,300This ZIP$152,300Iowa$208,000US $332,700 |
| Median gross rent | $950This ZIP$950Iowa$972US $1,413 |
| Bachelor's degree or higher | 22.6%This ZIP22.6% |
| Mean commute | 23.3 minThis ZIP23.3 min |
| Population density | 12.5 / sq miThis ZIP12.5 / sq mi |
Business and tax activity
| Business establishments | 49This ZIP49 |
|---|---|
| Employees | 235This ZIP235 |
| Annual payroll | $10,625,000This ZIP$10,625,000 |
| Tax returns filed | 820This ZIP820 |
| Total adjusted gross income | $59,661,000This ZIP$59,661,000 |
Land area
| Land area | 135.33 sq miThis ZIP135.33 sq mi |
|---|---|
| Water area | 0.01 sq miThis ZIP0.01 sq mi |
Counties 51535 spans
A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.
| County | Share of this ZIP |
|---|---|
| Cass County | 56.5% |
| Pottawattamie County | 43.5% |
Other place names in 51535
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 51535
| ZIP | City | Distance |
|---|---|---|
51544 | Lewis, IA | 6.2 mi |
51532 | Elliott, IA | 6.2 mi |
50847 | Grant, IA | 9.5 mi |
50843 | Cumberland, IA | 12.6 mi |
51591 | Red Oak, IA | 13.6 mi |
50022 | Atlantic, IA | 14.5 mi |
51525 | Carson, IA | 15.2 mi |
51560 | Oakland, IA | 15.5 mi |
51566 | Red Oak, IA | 15.6 mi |
51541 | Henderson, IA | 16.2 mi |
Find every ZIP code within 10 miles of 51535 →
Questions about this ZIP code
Where is ZIP code 51535?
51535 is in Griswold, Iowa, in Cass County. Its published point location is 41.2265, -95.1267.
What county is 51535 in?
51535 spans 2 counties: Cass County and Pottawattamie County. Most of it falls in Cass County, measured by overlapping land area — the county holding the most land in a ZIP code is not always the one holding the most residents.
What area code is 51535?
Griswold uses area code 712, from NANPA's telephone records.
What time zone is 51535 in?
51535 uses America/Chicago.
How many people live in 51535?
About 1,697 people live in ZIP code 51535, in 740 households, at 12.5 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 51535?
$76,371 a year, against $75,059 across Iowa.
What ZIP codes are near 51535?
The closest are 51544 (6.2 mi), 51532 (6.2 mi), 50847 (9.5 mi), 50843 (12.6 mi) and 51591 (13.6 mi).
Is 51535 a PO Box ZIP code?
51535 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “51535 ZIP Code — Griswold, Iowa (Cass County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/51535
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/51535.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.