| ZIP Codes: | 8 ZIP Codes (7 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Codes: | 235 / 573 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:54:05 PM |
| Population: | 20,810 [See All] |
| FIPS: | 29221 |
| Land Area: | 556 sq mi |
| Water Area: | 2 sq mi |
| Coordinates: | 37.9206, -90.7856 |
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20,810 residents live across 8 ZIPs covering 556 sq mi, served by 8 distinct USPS-recognized cities.
Population moved from 21,439 to 20,810 from 2014 to 2024 — a -2.9% change. 3 ZIPs gained residents, 5 lost.
The county's wealthiest ZIP 63631 (Caledonia, $74,211 median) and poorest ZIP 63622 (Belgrade, $31,750) are 4.8 miles apart — a 2.3× income gap across local geography.
Median home values vary 1.5× across this county — from $99,500 in 63648 (Irondale) to $149,800 in 63630 (Cadet).
Density varies 6× across the county — from 14 people/sq mi in 63631 (Caledonia) to 80 in 63660 (Mineral Point).
Educational attainment ranges from 5.7% bachelor's+ in 63071 (Richwoods) to 29.4% in 63622 (Belgrade) — the breadth of educational profiles across the area.
Within Missouri, this is the #52 most populous of 116 counties and ranks #95 for median household income .
Weighted by population, the typical household earns about $55,749 across the county — reflecting what a typical resident sees, not a simple ZIP average.
11.9% of adults age 25+ hold a bachelor's degree or higher (1,714 of 14,420 reporting).
7 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.
A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 63664 | Potosi | Standard | 9,693 | $61,216 | 296.6 | 20.5% |
| 63630 | Cadet | Standard | 4,006 | $52,482 | 72.8 | 0.8% |
| 63660 | Mineral Point | Standard | 2,784 | $51,410 | 34.7 | -33.6% |
| 63648 | Irondale | Standard | 1,858 | $51,765 | 31.2 | 19.4% |
| 63071 | Richwoods | Standard | 1,113 | $44,853 | 40.4 | -19.8% |
| 63622 | Belgrade | Standard | 764 | $31,750 | 41.6 | -9.3% |
| 63631 | Caledonia | Standard | 544 | $74,211 | 38.5 | -56.2% |
| 63674 | Tiff | PO Box | 48 | — | 0.0 | -75.9% |