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Where 51523 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 51523 into a pocket calculator and turn it upside down: EZSIS — not quite a word, sorry.
- ➕ As a number, 51,523 = 67 × 769. Its digits add up to 16, a total 1,922 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1100100101000011 - 🏠 Its numerical neighbours: 51521 (Avoca, IA, 48 mi away) and 51525 (Carson, IA, 58 mi away).
- 🔄 Backwards, 51523 becomes 32515, which is not a ZIP code at all.
- 👥 28 other ZIP codes are made of exactly the same digits (12553, 15235, 15253, 15325, 15352, 15532, …). The farthest-flung twin is 12553 in New Windsor, NY, 1,132 miles away.
- 🧭 Farther north than 75% of all ZIP codes, and farther west than 71%.
- 🎯195 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 51523 and you would come out at 41.92°S, 83.93°E — 836 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 15h 14m of daylight. Shortest: 9h 07m.
- 📏 At 50.2 square miles of land, 51523 is bigger than 60% of ZIP codes — room for about 38 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 379This ZIP379 |
|---|---|
| Households | 169This ZIP169 |
| Housing units | 178This ZIP178 |
| Median age | 50.2This ZIP50.2Iowa38.6US 38.9 |
| Median household income | $82,625This ZIP$82,625Iowa$75,059US $80,734 |
| Median home value | $136,800This ZIP$136,800Iowa$208,000US $332,700 |
| Median gross rent | $857This ZIP$857Iowa$972US $1,413 |
| Bachelor's degree or higher | 18.9%This ZIP18.9% |
| Mean commute | 22.1 minThis ZIP22.1 min |
| Population density | 7.6 / sq miThis ZIP7.6 / sq mi |
Business and tax activity
| Business establishments | 3This ZIP3 |
|---|---|
| Employees | 33This ZIP33 |
| Annual payroll | $2,098,000This ZIP$2,098,000 |
| Tax returns filed | 150This ZIP150 |
| Total adjusted gross income | $13,312,000This ZIP$13,312,000 |
Land area
| Land area | 50.17 sq miThis ZIP50.17 sq mi |
|---|---|
| Water area | 0.66 sq miThis ZIP0.66 sq mi |
Counties 51523 spans
A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.
| County | Share of this ZIP |
|---|---|
| Monona County | 92.0% |
| Harrison County | 8.0% |
Other place names in 51523
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 51523
| ZIP | City | Distance |
|---|---|---|
51545 | Little Sioux, IA | 5.2 mi |
51040 | Onawa, IA | 8.1 mi |
51558 | Moorhead, IA | 9.6 mi |
51564 | Pisgah, IA | 10.4 mi |
68020 | Decatur, NE | 10.8 mi |
68061 | Tekamah, NE | 10.8 mi |
51557 | Mondamin, IA | 12.9 mi |
51572 | Soldier, IA | 14.2 mi |
51010 | Castana, IA | 14.2 mi |
51063 | Whiting, IA | 16.3 mi |
Find every ZIP code within 10 miles of 51523 →
Questions about this ZIP code
Where is ZIP code 51523?
51523 is in Blencoe, Iowa, in Monona County. Its published point location is 41.9152, -96.0677.
What county is 51523 in?
51523 spans 2 counties: Monona County and Harrison County. Most of it falls in Monona 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 51523?
Blencoe uses area code 712, from NANPA's telephone records.
What time zone is 51523 in?
51523 uses America/Chicago.
How many people live in 51523?
About 379 people live in ZIP code 51523, in 169 households, at 7.6 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 51523?
$82,625 a year, against $75,059 across Iowa.
What ZIP codes are near 51523?
The closest are 51545 (5.2 mi), 51040 (8.1 mi), 51558 (9.6 mi), 51564 (10.4 mi) and 68020 (10.8 mi).
Is 51523 a PO Box ZIP code?
51523 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “51523 ZIP Code — Blencoe, Iowa (Monona County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/51523
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/51523.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.