| ZIP Codes: | 20 ZIP Codes (18 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Codes: | 235 / 573 / 636 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:42 PM |
| Population: | 114,137 [See All] |
| FIPS: | 29071 |
| CBSA: | St. Louis, MO-IL |
| Land Area: | 1,068 sq mi |
| Water Area: | 9 sq mi |
| Coordinates: | 38.4153, -90.9806 |
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114,137 residents live across 20 ZIPs covering 1,068 sq mi, served by 20 distinct USPS-recognized cities.
Population moved from 110,358 to 114,137 from 2014 to 2024 — a +3.4% change. 7 ZIPs gained residents, 13 lost.
The county's wealthiest ZIP 63073 (Saint Albans, $250,001 median) and poorest ZIP 63037 (Gerald, $50,203) are 32.4 miles apart — a 5.0× income gap across local geography.
Median home values vary 4.6× across this county — from $177,500 in 63037 (Gerald) to $811,100 in 63073 (Saint Albans).
Density varies 9× across the county — from 32 people/sq mi in 63013 (Beaufort) to 281 in 63090 (Washington).
Educational attainment ranges from 12.4% bachelor's+ in 63060 (Lonedell) to 71.8% in 63073 (Saint Albans) — the breadth of educational profiles across the area.
Within Missouri, this is the #10 most populous of 116 counties and ranks #8 for median household income .
Weighted by population, the typical household earns about $75,807 across the county — reflecting what a typical resident sees, not a simple ZIP average.
24.6% of adults age 25+ hold a bachelor's degree or higher (19,952 of 81,015 reporting).
18 Standard delivery, 2 PO Box only, 0 single-entity Unique ZIPs serve this county.
Median household income spans 5.0× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 63090 | Washington | Standard | 23,258 | $85,025 | 82.8 | 6.7% |
| 63084 | Union | Standard | 20,708 | $75,992 | 79.3 | 13.8% |
| 63069 | Pacific | Standard | 15,697 | $78,185 | 70.2 | 3.5% |
| 63080 | Sullivan | Standard | 13,124 | $66,541 | 245.4 | -0.2% |
| 63077 | Saint Clair | Standard | 11,391 | $56,281 | 88.3 | -0.1% |
| 63068 | New Haven | Standard | 6,202 | $79,632 | 95.2 | 18.0% |
| 63089 | Villa Ridge | Standard | 5,662 | $72,731 | 37.0 | 2.9% |
| 63072 | Robertsville | Standard | 3,469 | $80,333 | 41.2 | 25.6% |
| 63037 | Gerald | Standard | 2,970 | $50,203 | 82.7 | -2.1% |
| 63060 | Lonedell | Standard | 2,192 | $54,926 | 45.4 | -21.3% |
| 63015 | Catawissa | Standard | 1,939 | $88,750 | 16.3 | -13.8% |
| 63056 | Leslie | Standard | 1,896 | $75,517 | 58.4 | -4.6% |
| 63055 | Labadie | Standard | 1,693 | $79,125 | 29.2 | -25.5% |
| 63013 | Beaufort | Standard | 1,136 | $99,337 | 35.7 | -27.3% |
| 63039 | Gray Summit | Standard | 986 | $70,329 | 4.5 | -13.8% |
| 63073 | Saint Albans | PO Box | 803 | $250,001 | 4.8 | -9.9% |
| 63014 | Berger | Standard | 426 | $61,842 | 34.8 | -14.8% |
| 63041 | Grubville | Standard | 309 | $68,750 | 13.0 | -35.9% |
| 63061 | Luebbering | Standard | 216 | $99,405 | 4.1 | -0.5% |
| 63079 | Stanton | PO Box | 60 | — | 0.0 | 566.7% |