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Where 51638 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 51638 into a pocket calculator and turn it upside down: BEgIS — not quite a word, sorry.
- ➕ As a number, 51,638 = 2 × 25819. Its digits add up to 23, a total 2,533 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1100100110110110 - 🏠 Its numerical neighbours: 51637 (College Springs, IA, 17 mi away) and 51639 (Farragut, IA, 13 mi away).
- 🔄 Backwards, 51638 becomes 83615 — and that is a real ZIP code: Donnelly, ID, 1,084 miles away.
- 👥 49 other ZIP codes are made of exactly the same digits (13658, 13685, 13856, 13865, 15368, 15638, …). The farthest-flung twin is 83651 in Nampa, ID, 1,106 miles away.
- 🧭 Farther north than 65% of all ZIP codes, and farther west than 69%.
- 🎯188 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 51638 and you would come out at 40.84°S, 84.73°E — 918 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 15h 06m of daylight. Shortest: 9h 14m.
- 📏 At 80.4 square miles of land, 51638 is bigger than 73% of ZIP codes — room for about 61 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 1,258This ZIP1,258 |
|---|---|
| Households | 569This ZIP569 |
| Housing units | 623This ZIP623 |
| Median age | 50.5This ZIP50.5Iowa38.6US 38.9 |
| Median household income | $59,107This ZIP$59,107Iowa$75,059US $80,734 |
| Median home value | $120,700This ZIP$120,700Iowa$208,000US $332,700 |
| Median gross rent | $606This ZIP$606Iowa$972US $1,413 |
| Bachelor's degree or higher | 17.9%This ZIP17.9% |
| Mean commute | 25.5 minThis ZIP25.5 min |
| Population density | 15.6 / sq miThis ZIP15.6 / sq mi |
Business and tax activity
| Business establishments | 30This ZIP30 |
|---|---|
| Employees | 89This ZIP89 |
| Annual payroll | $2,730,000This ZIP$2,730,000 |
| Tax returns filed | 610This ZIP610 |
| Total adjusted gross income | $43,332,000This ZIP$43,332,000 |
Land area
| Land area | 80.44 sq miThis ZIP80.44 sq mi |
|---|---|
| Water area | 0.19 sq miThis ZIP0.19 sq mi |
Counties 51638 spans
A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.
| County | Share of this ZIP |
|---|---|
| Page County | 98.0% |
| Montgomery County | 2.0% |
Other place names in 51638
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 51638
| ZIP | City | Distance |
|---|---|---|
51603 | Shenandoah, IA | 7.4 mi |
51601 | Shenandoah, IA | 8.2 mi |
51645 | Imogene, IA | 8.7 mi |
51656 | Yorktown, IA | 9.2 mi |
51636 | Coin, IA | 11.9 mi |
51566 | Red Oak, IA | 12.4 mi |
51632 | Clarinda, IA | 13.1 mi |
51639 | Farragut, IA | 13.2 mi |
51573 | Stanton, IA | 13.3 mi |
51649 | Randolph, IA | 13.7 mi |
Find every ZIP code within 10 miles of 51638 →
Questions about this ZIP code
Where is ZIP code 51638?
51638 is in Essex, Iowa, in Page County. Its published point location is 40.8374, -95.2662.
What county is 51638 in?
51638 spans 2 counties: Page County and Montgomery County. Most of it falls in Page 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 51638?
Essex uses area code 712, from NANPA's telephone records.
What time zone is 51638 in?
51638 uses America/Chicago.
How many people live in 51638?
About 1,258 people live in ZIP code 51638, in 569 households, at 15.6 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 51638?
$59,107 a year, against $75,059 across Iowa.
What ZIP codes are near 51638?
The closest are 51603 (7.4 mi), 51601 (8.2 mi), 51645 (8.7 mi), 51656 (9.2 mi) and 51636 (11.9 mi).
Is 51638 a PO Box ZIP code?
51638 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “51638 ZIP Code — Essex, Iowa (Page County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/51638
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/51638.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.