| ZIP Codes: | 10 ZIP Codes (8 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Codes: | 235 / 573 / 636 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:54:01 PM |
| Population: | 61,378 [See All] |
| FIPS: | 29113 |
| CBSA: | St. Louis, MO-IL |
| Land Area: | 571 sq mi |
| Water Area: | 14 sq mi |
| Coordinates: | 39.0510, -90.9402 |
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61,378 residents live across 10 ZIPs covering 571 sq mi, served by 10 distinct USPS-recognized cities.
Population moved from 51,145 to 61,378 from 2014 to 2024 — a +20.0% change. 8 ZIPs gained residents, 1 lost.
The county's wealthiest ZIP 63389 (Winfield, $98,393 median) and poorest ZIP 63343 (Elsberry, $74,531) are 11.4 miles apart — a 1.3× income gap across local geography.
Median home values vary 2.0× across this county — from $169,400 in 63343 (Elsberry) to $339,400 in 63369 (Old Monroe).
Density varies 10× across the county — from 27 people/sq mi in 63377 (Silex) to 261 in 63362 (Moscow Mills).
Educational attainment ranges from 9.5% bachelor's+ in 63347 (Foley) to 21.2% in 63377 (Silex) — the breadth of educational profiles across the area.
Within Missouri, this is the #18 most populous of 116 counties and ranks #5 for median household income with the #1 fastest decade growth .
Weighted by population, the typical household earns about $89,785 across the county — reflecting what a typical resident sees, not a simple ZIP average.
18.3% of adults age 25+ hold a bachelor's degree or higher (7,560 of 41,264 reporting).
8 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 |
|---|---|---|---|---|---|---|
| 63379 | Troy | Standard | 27,731 | $91,194 | 136.9 | 15.9% |
| 63362 | Moscow Mills | Standard | 9,930 | $88,977 | 38.1 | 49.3% |
| 63389 | Winfield | Standard | 7,616 | $98,393 | 48.0 | 14.4% |
| 63343 | Elsberry | Standard | 4,381 | $74,531 | 114.9 | 5.6% |
| 63377 | Silex | Standard | 3,501 | $88,424 | 129.0 | 30.4% |
| 63347 | Foley | Standard | 3,140 | $81,949 | 39.6 | -5.5% |
| 63369 | Old Monroe | Standard | 2,822 | $96,250 | 29.4 | 47.8% |
| 63349 | Hawk Point | Standard | 2,149 | $80,375 | 34.9 | 21.4% |
| 63387 | Whiteside | PO Box | 108 | $104,375 | 0.0 | 58.8% |
| 63370 | Olney | PO Box | — | — | 0.0 | — |