| ZIP Codes: | 8 ZIP Codes (8 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Code: | 660 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:46 PM |
| Population: | 6,377 [See All] |
| FIPS: | 29211 |
| Land Area: | 744 sq mi |
| Water Area: | 3 sq mi |
| Coordinates: | 40.2312, -93.1318 |
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6,377 residents live across 8 ZIPs covering 744 sq mi, served by 8 distinct USPS-recognized cities.
Population moved from 6,893 to 6,377 from 2014 to 2024 — a -7.5% change. 3 ZIPs gained residents, 5 lost.
The county's wealthiest ZIP 63566 (Winigan, $97,396 median) and poorest ZIP 63545 (Green City, $40,104) are 15.4 miles apart — a 2.4× income gap across local geography.
Median home values vary 1.7× across this county — from $90,000 in 64667 (Newtown) to $156,300 in 63545 (Green City).
Density varies 8× across the county — from 2 people/sq mi in 63560 (Pollock) to 13 in 63556 (Milan).
Educational attainment ranges from 12.3% bachelor's+ in 64646 (Humphreys) to 25.0% in 63566 (Winigan) — the breadth of educational profiles across the area.
Within Missouri, this is the #102 most populous of 116 counties and ranks #72 for median household income .
Weighted by population, the typical household earns about $53,820 across the county — reflecting what a typical resident sees, not a simple ZIP average.
16.1% of adults age 25+ hold a bachelor's degree or higher (733 of 4,561 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.
Sullivan County lost 7.5% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 63556 | Milan | Standard | 3,196 | $58,851 | 239.6 | -12.7% |
| 63544 | Green Castle | Standard | 1,159 | $44,167 | 139.3 | 18.9% |
| 63545 | Green City | Standard | 968 | $40,104 | 103.0 | -15.4% |
| 64646 | Humphreys | Standard | 471 | $68,125 | 54.6 | 59.7% |
| 64667 | Newtown | Standard | 255 | $47,841 | 82.6 | -27.1% |
| 64645 | Harris | Standard | 195 | $53,125 | 70.6 | 58.5% |
| 63566 | Winigan | Standard | 72 | $97,396 | 19.7 | -46.7% |
| 63560 | Pollock | Standard | 61 | $56,607 | 34.5 | -70.8% |