63631
ZIP 63631 is Caledonia, Missouri, mostly in Washington County; area code 573; Central time.
- Type
- Standard
- Time zone
- America/Chicago
- County
- Washington +1 more
- Metro area
- none
- Population
- 544
- Coordinates
- 37.7546, -90.7880
Weather right now
Asking the National Weather Service…
Where 63631 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 63631 into a pocket calculator and turn it upside down: IEgEg — not quite a word, sorry.
- ➕ As a number, 63,631 = 17 × 19 × 197. Its digits add up to 19, a total 2,454 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1111100010001111 - 🏠 Its numerical neighbours: 63630 (Cadet, MO, 19 mi away) and 63632 (Cascade, MO, 42 mi away).
- 🔄 Backwards, 63631 becomes 13636 — and that is a real ZIP code: Ellisburg, NY, 870 miles away.
- 👥 15 other ZIP codes are made of exactly the same digits (13636, 16633, 31636, 33166, 33616, 33661, …). The farthest-flung twin is 33166 in Miami, FL, 1,027 miles away.
- 🧭 Farther south than 60% of all ZIP codes, and farther west than 58%.
- 🎯443 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 63631 and you would come out at 37.75°S, 89.21°E — 1,237 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 14h 47m of daylight. Shortest: 9h 33m.
- 📏 At 41.2 square miles of land, 63631 is bigger than 54% of ZIP codes — room for about 31 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 544This ZIP544 |
|---|---|
| Households | 266This ZIP266 |
| Housing units | 308This ZIP308 |
| Median age | 56.1This ZIP56.1Missouri39.0US 38.9 |
| Median household income | $74,211This ZIP$74,211Missouri$70,702US $80,734 |
| Median home value | $127,500This ZIP$127,500Missouri$230,300US $332,700 |
| Median gross rent | $790This ZIP$790Missouri$1,033US $1,413 |
| Bachelor's degree or higher | 14.4%This ZIP14.4% |
| Mean commute | 47.4 minThis ZIP47.4 min |
| Population density | 13.2 / sq miThis ZIP13.2 / sq mi |
Business and tax activity
| Business establishments | 15This ZIP15 |
|---|---|
| Employees | 87This ZIP87 |
| Annual payroll | $1,850,000This ZIP$1,850,000 |
| Tax returns filed | 330This ZIP330 |
| Total adjusted gross income | $17,506,000This ZIP$17,506,000 |
Land area
| Land area | 41.24 sq miThis ZIP41.24 sq mi |
|---|---|
| Water area | 0.03 sq miThis ZIP0.03 sq mi |
Counties 63631 spans
A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.
| County | Share of this ZIP |
|---|---|
| Washington County | 64.5% |
| Iron County | 35.5% |
Other place names in 63631
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 63631
| ZIP | City | Distance |
|---|---|---|
63648 | Irondale, MO | 6.3 mi |
63622 | Belgrade, MO | 7.0 mi |
63623 | Belleview, MO | 8.3 mi |
63624 | Bismarck, MO | 8.4 mi |
63656 | Middle Brook, MO | 10.9 mi |
63663 | Pilot Knob, MO | 11.8 mi |
63660 | Mineral Point, MO | 12.0 mi |
63650 | Ironton, MO | 13.1 mi |
63664 | Potosi, MO | 13.2 mi |
63653 | Leadwood, MO | 13.2 mi |
Find every ZIP code within 10 miles of 63631 →
Questions about this ZIP code
Where is ZIP code 63631?
63631 is in Caledonia, Missouri, in Washington County. Its published point location is 37.7546, -90.7880.
What county is 63631 in?
63631 spans 2 counties: Washington County and Iron County. Most of it falls in Washington 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 63631?
Caledonia uses area code 573, from NANPA's telephone records.
What time zone is 63631 in?
63631 uses America/Chicago.
How many people live in 63631?
About 544 people live in ZIP code 63631, in 266 households, at 13.2 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 63631?
$74,211 a year, against $70,702 across Missouri.
What ZIP codes are near 63631?
The closest are 63648 (6.3 mi), 63622 (7 mi), 63623 (8.3 mi), 63624 (8.4 mi) and 63656 (10.9 mi).
Is 63631 a PO Box ZIP code?
63631 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “63631 ZIP Code — Caledonia, Missouri (Washington County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/63631
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/63631.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.