| ZIP Codes: | 8 ZIP Codes (8 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Codes: | 235 / 573 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:40 PM |
| Population: | 22,314 [See All] |
| FIPS: | 29007 |
| CBSA: | Mexico, MO |
| Land Area: | 643 sq mi |
| Water Area: | 5 sq mi |
| Coordinates: | 39.2137, -91.7291 |
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22,314 residents live across 8 ZIPs covering 643 sq mi, served by 8 distinct USPS-recognized cities.
Population moved from 24,041 to 22,314 from 2014 to 2024 — a -7.2% change. 2 ZIPs gained residents, 6 lost.
The county's wealthiest ZIP 65285 (Thompson, $98,625 median) and poorest ZIP 63345 (Farber, $43,500) are 22.2 miles apart — a 2.3× income gap across local geography.
Median home values vary 2.7× across this county — from $80,300 in 63345 (Farber) to $220,800 in 65285 (Thompson).
Density varies 12× across the county — from 5 people/sq mi in 65280 (Rush Hill) to 68 in 65265 (Mexico).
Educational attainment ranges from 6.0% bachelor's+ in 63345 (Farber) to 19.6% in 65265 (Mexico) — the breadth of educational profiles across the area.
Within Missouri, this is the #48 most populous of 116 counties and ranks #37 for median household income .
Weighted by population, the typical household earns about $58,387 across the county — reflecting what a typical resident sees, not a simple ZIP average.
16.4% of adults age 25+ hold a bachelor's degree or higher (2,623 of 16,032 reporting).
8 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.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.
Audrain County lost 7.2% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 65265 | Mexico | Standard | 15,153 | $56,969 | 223.0 | -0.6% |
| 63382 | Vandalia | Standard | 4,033 | $60,733 | 129.8 | -21.2% |
| 63352 | Laddonia | Standard | 1,018 | $54,485 | 108.6 | -3.8% |
| 65264 | Martinsburg | Standard | 919 | $46,042 | 60.8 | 31.1% |
| 65285 | Thompson | Standard | 523 | $98,625 | 54.8 | -41.6% |
| 63345 | Farber | Standard | 291 | $43,500 | 21.8 | -46.2% |
| 65232 | Benton City | Standard | 256 | $83,542 | 22.5 | 2.8% |
| 65280 | Rush Hill | Standard | 121 | $93,036 | 22.1 | -46.5% |