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Where 51023 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 51023 into a pocket calculator and turn it upside down: EZOIS — not quite a word, sorry.
- ➕ As a number, 51,023 = 7 × 37 × 197. Its digits add up to 11, a total 714 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1100011101001111 - 🏠 Its numerical neighbours: 51022 (Granville, IA, 31 mi away) and 51024 (Hinton, IA, 28 mi away).
- 🔄 Backwards, 51023 becomes 32015, which is not a ZIP code at all.
- 👥 73 other ZIP codes are made of exactly the same digits (01235, 01253, 01523, 01532, 02135, 02153, …). The farthest-flung twin is 02351 in Abington, MA, 1,295 miles away.
- 🧭 Farther north than 83% of all ZIP codes, and farther west than 72%.
- 🎯245 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 51023 and you would come out at 43.01°S, 83.54°E — 772 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 15h 22m of daylight. Shortest: 9h 00m.
- 📏 At 119.9 square miles of land, 51023 is bigger than 82% of ZIP codes — room for about 91 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 3,473This ZIP3,473 |
|---|---|
| Households | 1,236This ZIP1,236 |
| Housing units | 1,347This ZIP1,347 |
| Median age | 36.9This ZIP36.9Iowa38.6US 38.9 |
| Median household income | $80,357This ZIP$80,357Iowa$75,059US $80,734 |
| Median home value | $173,300This ZIP$173,300Iowa$208,000US $332,700 |
| Median gross rent | $926This ZIP$926Iowa$972US $1,413 |
| Bachelor's degree or higher | 21.3%This ZIP21.3% |
| Mean commute | 16.0 minThis ZIP16.0 min |
| Population density | 29.0 / sq miThis ZIP29.0 / sq mi |
Business and tax activity
| Business establishments | 88This ZIP88 |
|---|---|
| Employees | 920This ZIP920 |
| Annual payroll | $36,474,000This ZIP$36,474,000 |
| Tax returns filed | 1,350This ZIP1,350 |
| Total adjusted gross income | $87,756,000This ZIP$87,756,000 |
Land area
| Land area | 119.86 sq miThis ZIP119.86 sq mi |
|---|---|
| Water area | 0.83 sq miThis ZIP0.83 sq mi |
Counties 51023 spans
A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.
| County | Share of this ZIP |
|---|---|
| Sioux County | 70.2% |
| Union County | 29.8% |
Other place names in 51023
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 51023
| ZIP | City | Distance |
|---|---|---|
51011 | Chatsworth, IA | 6.8 mi |
51027 | Ireton, IA | 7.4 mi |
57034 | Hudson, SD | 8.7 mi |
57001 | Alcester, SD | 9.8 mi |
51001 | Akron, IA | 12.2 mi |
57027 | Fairview, SD | 13.1 mi |
51036 | Maurice, IA | 14.1 mi |
51250 | Sioux Center, IA | 14.3 mi |
51247 | Rock Valley, IA | 14.4 mi |
51008 | Brunsville, IA | 16.8 mi |
Find every ZIP code within 10 miles of 51023 →
Questions about this ZIP code
Where is ZIP code 51023?
51023 is in Hawarden, Iowa, in Sioux County. Its published point location is 43.0067, -96.4635.
What county is 51023 in?
51023 spans 2 counties: Sioux County and Union County. Most of it falls in Sioux 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 51023?
Hawarden uses area code 712, from NANPA's telephone records.
What time zone is 51023 in?
51023 uses America/Chicago.
How many people live in 51023?
About 3,473 people live in ZIP code 51023, in 1,236 households, at 29.0 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 51023?
$80,357 a year, against $75,059 across Iowa.
What ZIP codes are near 51023?
The closest are 51011 (6.8 mi), 51027 (7.4 mi), 57034 (8.7 mi), 57001 (9.8 mi) and 51001 (12.2 mi).
Is 51023 a PO Box ZIP code?
51023 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “51023 ZIP Code — Hawarden, Iowa (Sioux County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/51023
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/51023.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.