| ZIP Codes: | 7 ZIP Codes (5 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Codes: | 235 / 573 / 636 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:46 PM |
| Population: | 36,041 [See All] |
| FIPS: | 29219 |
| CBSA: | St. Louis, MO-IL |
| Land Area: | 396 sq mi |
| Water Area: | 8 sq mi |
| Coordinates: | 38.7783, -91.1374 |
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36,041 residents live across 7 ZIPs covering 396 sq mi, served by 7 distinct USPS-recognized cities.
Population moved from 31,914 to 35,051 from 2014 to 2024 — a +9.8% change. 4 ZIPs gained residents, 0 lost.
The county's wealthiest ZIP 63381 (Truxton, $111,890 median) and poorest ZIP 63380 (Truesdale, $58,750) are 13.9 miles apart — a 1.9× income gap across local geography.
Median home values vary 1.4× across this county — from $214,300 in 63380 (Truesdale) to $292,600 in 63357 (Marthasville).
Density varies 32× across the county — from 22 people/sq mi in 63381 (Truxton) to 690 in 63380 (Truesdale).
Educational attainment ranges from 12.5% bachelor's+ in 63380 (Truesdale) to 24.6% in 63357 (Marthasville) — the breadth of educational profiles across the area.
Within Missouri, this is the #34 most populous of 116 counties and ranks #7 for median household income with the #6 fastest decade growth .
Weighted by population, the typical household earns about $80,675 across the county — reflecting what a typical resident sees, not a simple ZIP average.
20.0% of adults age 25+ hold a bachelor's degree or higher (4,968 of 24,847 reporting).
5 Standard delivery, 2 PO Box only, 0 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 63383 | Warrenton | Standard | 16,927 | $75,282 | 161.4 | 7.5% |
| 63390 | Wright City | Standard | 10,970 | $82,351 | 79.3 | 2.4% |
| 63357 | Marthasville | Standard | 6,536 | $92,200 | 125.5 | 30.5% |
| 63380 | Truesdale | Standard | 990 | $58,750 | 1.4 | — |
| 63381 | Truxton | Standard | 618 | $111,890 | 28.4 | 38.9% |
| 63342 | Dutzow | PO Box | — | — | 0.0 | — |
| 63378 | Treloar | PO Box | — | — | 0.0 | — |