| ZIP Codes: | 6 ZIP Codes (6 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Code: | 605 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:13:44 PM |
| Population: | 22,693 [See All] |
| FIPS: | 46135 |
| CBSA: | Yankton, SD |
| Land Area: | 418 sq mi |
| Water Area: | 11 sq mi |
| Coordinates: | 42.9740, -97.3650 |
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22,693 residents live across 6 ZIPs covering 418 sq mi, served by 6 distinct USPS-recognized cities.
Population moved from 21,786 to 22,693 from 2014 to 2024 — a +4.2% change. 2 ZIPs gained residents, 4 lost.
The county's wealthiest ZIP 57067 (Utica, $102,941 median) and poorest ZIP 57031 (Gayville, $64,794) are 17.6 miles apart — a 1.6× income gap across local geography.
Median home values vary 2.4× across this county — from $137,100 in 57031 (Gayville) to $326,900 in 57067 (Utica).
Density varies 55× across the county — from 3 people/sq mi in 57040 (Lesterville) to 182 in 57078 (Yankton).
Educational attainment ranges from 13.9% bachelor's+ in 57031 (Gayville) to 36.1% in 57067 (Utica) — the breadth of educational profiles across the area.
Within South Dakota, this is the #9 most populous of 82 counties and ranks #23 for median household income .
Weighted by population, the typical household earns about $72,330 across the county — reflecting what a typical resident sees, not a simple ZIP average.
31.8% of adults age 25+ hold a bachelor's degree or higher (5,062 of 15,920 reporting).
6 Standard delivery, 0 PO Box only, 0 single-entity Unique ZIPs serve this county.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 57078 | Yankton | Standard | 20,383 | $71,268 | 112.1 | 7.0% |
| 57031 | Gayville | Standard | 784 | $64,794 | 43.1 | 25.6% |
| 57046 | Mission Hill | Standard | 521 | $88,583 | 54.7 | -20.0% |
| 57072 | Volin | Standard | 435 | $91,750 | 77.2 | -33.7% |
| 57067 | Utica | Standard | 348 | $102,941 | 63.8 | -23.7% |
| 57040 | Lesterville | Standard | 222 | $72,250 | 66.9 | -36.8% |