| ZIP Codes: | 9 ZIP Codes (9 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Codes: | 235 / 573 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:44 PM |
| Population: | 12,339 [See All] |
| FIPS: | 29151 |
| CBSA: | Jefferson City, MO |
| Land Area: | 588 sq mi |
| Water Area: | 5 sq mi |
| Coordinates: | 38.4153, -91.9512 |
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12,339 residents live across 9 ZIPs covering 588 sq mi, served by 9 distinct USPS-recognized cities.
Population moved from 13,311 to 12,339 from 2014 to 2024 — a -7.3% change. 3 ZIPs gained residents, 6 lost.
The county's wealthiest ZIP 65085 (Westphalia, $103,563 median) and poorest ZIP 65051 (Linn, $53,289) are 19.4 miles apart — a 1.9× income gap across local geography.
Median home values vary 2.3× across this county — from $161,600 in 65024 (Chamois) to $370,000 in 65048 (Koeltztown).
Density varies 5× across the county — from 8 people/sq mi in 65001 (Argyle) to 43 in 65054 (Loose Creek).
Educational attainment ranges from 4.5% bachelor's+ in 65048 (Koeltztown) to 36.6% in 65001 (Argyle) — the breadth of educational profiles across the area.
Within Missouri, this is the #77 most populous of 116 counties and ranks #14 for median household income .
Weighted by population, the typical household earns about $71,453 across the county — reflecting what a typical resident sees, not a simple ZIP average.
23.1% of adults age 25+ hold a bachelor's degree or higher (1,947 of 8,433 reporting).
9 Standard delivery, 0 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.
Osage County lost 7.3% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 65051 | Linn | Standard | 4,487 | $53,289 | 126.8 | -12.9% |
| 65035 | Freeburg | Standard | 1,681 | $90,815 | 74.6 | -12.6% |
| 65058 | Meta | Standard | 1,274 | $71,771 | 105.8 | 14.3% |
| 65016 | Bonnots Mill | Standard | 1,240 | $78,750 | 54.7 | -19.4% |
| 65024 | Chamois | Standard | 1,218 | $68,438 | 104.5 | -0.4% |
| 65085 | Westphalia | Standard | 1,193 | $103,563 | 62.8 | -1.7% |
| 65054 | Loose Creek | Standard | 893 | — | 20.7 | 19.7% |
| 65048 | Koeltztown | Standard | 194 | $88,750 | 18.9 | 51.6% |
| 65001 | Argyle | Standard | 159 | $80,938 | 18.7 | -41.5% |