| ZIP Codes: | 8 ZIP Codes (6 Standard, 1 PO Box, 1 Unique) [See All] |
| Area Code: | 605 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:13:41 PM |
| Population: | 33,214 [See All] |
| FIPS: | 46011 |
| CBSA: | Brookings, SD |
| Land Area: | 736 sq mi |
| Water Area: | 7 sq mi |
| Coordinates: | 44.3347, -96.8248 |
| Quick Link: |
34,745 residents live across 8 ZIPs covering 736 sq mi, served by 7 distinct USPS-recognized cities.
Population moved from 32,454 to 32,368 from 2014 to 2024 — a -0.3% change. 4 ZIPs gained residents, 3 lost.
The county's wealthiest ZIP 57002 (Aurora, $93,214 median) and poorest ZIP 57061 (Sinai, $56,875) are 19.5 miles apart — a 1.6× income gap across local geography.
Median home values vary 3.1× across this county — from $89,300 in 57061 (Sinai) to $273,900 in 57006 (Brookings).
Density varies 1129× across the county — from 6 people/sq mi in 57220 (Bruce) to 6,349 in 57007 (Brookings).
Educational attainment ranges from 23.5% bachelor's+ in 57026 (Elkton) to 46.4% in 57006 (Brookings) — the breadth of educational profiles across the area.
Within South Dakota, this is the #5 most populous of 82 counties and ranks #42 for median household income with the #19 fastest decade growth .
Hosts 1 single-entity Unique ZIP: 57007South Dakota State Univ .
Weighted by population, the typical household earns about $69,832 across the county — reflecting what a typical resident sees, not a simple ZIP average.
43.0% of adults age 25+ hold a bachelor's degree or higher (8,055 of 18,726 reporting). The most-educated ZIPs cluster around Brookings.
6 Standard delivery, 1 PO Box only, 1 single-entity Unique ZIPs serve this county.
1 ZIP in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
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.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 57006 | Brookings | Standard | 24,192 | $66,337 | 151.9 | -3.1% |
| 57071 | Volga | Standard | 3,149 | $77,138 | 130.7 | 2.7% |
| 57007 | Brookings | Unique | 2,377 | — | 0.4 | — |
| 57002 | Aurora | Standard | 1,674 | $93,214 | 58.8 | 77.7% |
| 57026 | Elkton | Standard | 1,531 | $80,568 | 137.6 | 18.0% |
| 57276 | White | Standard | 942 | $67,639 | 138.2 | -24.4% |
| 57220 | Bruce | Standard | 665 | $86,094 | 118.3 | -14.9% |
| 57061 | Sinai | PO Box | 215 | $56,875 | 0.4 | 32.7% |