| ZIP Codes: | 12 ZIP Codes (10 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Codes: | 812 / 930 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:12:07 PM |
| Population: | 36,177 [See All] |
| FIPS: | 18083 |
| CBSA: | Vincennes, IN |
| Land Area: | 539 sq mi |
| Water Area: | 8 sq mi |
| Coordinates: | 38.7455, -87.3608 |
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36,177 residents live across 12 ZIPs covering 539 sq mi, served by 12 distinct USPS-recognized cities.
Population moved from 38,325 to 36,157 from 2014 to 2024 — a -5.7% change. 4 ZIPs gained residents, 7 lost.
The county's wealthiest ZIP 47557 (Monroe City, $84,375 median) and poorest ZIP 47561 (Oaktown, $45,911) are 19.1 miles apart — a 1.8× income gap across local geography.
Median home values vary 2.5× across this county — from $71,800 in 47512 (Bicknell) to $182,300 in 47516 (Bruceville).
Density varies 105× across the county — from 6 people/sq mi in 47524 (Decker) to 609 in 47535 (Freelandville).
Educational attainment ranges from 3.2% bachelor's+ in 47597 (Wheatland) to 23.4% in 47557 (Monroe City) — the breadth of educational profiles across the area.
Within Indiana, this is the #45 most populous of 92 counties and ranks #66 for median household income .
Weighted by population, the typical household earns about $61,981 across the county — reflecting what a typical resident sees, not a simple ZIP average.
18.9% of adults age 25+ hold a bachelor's degree or higher (4,615 of 24,370 reporting).
10 Standard delivery, 2 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.
Knox County lost 5.6% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 47591 | Vincennes | Standard | 25,168 | $61,803 | 164.8 | -6.8% |
| 47512 | Bicknell | Standard | 4,243 | $57,857 | 45.6 | 12.4% |
| 47561 | Oaktown | Standard | 1,442 | $45,911 | 71.1 | 32.7% |
| 47557 | Monroe City | Standard | 1,345 | $84,375 | 46.5 | -2.4% |
| 47516 | Bruceville | Standard | 988 | $76,250 | 33.5 | -31.4% |
| 47535 | Freelandville | PO Box | 807 | $70,236 | 1.3 | 70.6% |
| 47597 | Wheatland | Standard | 745 | $56,953 | 42.5 | -38.9% |
| 47578 | Sandborn | Standard | 566 | $56,641 | 49.7 | -19.7% |
| 47528 | Edwardsport | Standard | 457 | $57,692 | 29.2 | -16.1% |
| 47524 | Decker | Standard | 302 | — | 52.3 | -51.3% |
| 47596 | Westphalia | PO Box | 94 | $93,958 | 2.0 | 11.9% |
| 47573 | Ragsdale | Standard | 20 | — | 0.5 | — |