ZIP code · Union Center · South Dakota · United States
ZIP code 57787 — Union Center
ZIP code 57787 serves Union Center, South Dakota.
- Postal code
- 57787Single source Value from one source, not cross-checked.
- City
- Union Center
- County
- Meade FIPS 46093
- State
- South Dakota
- Country
- United States
- Coordinates
- 44.6539, -102.7252 — precision precise (locality)
View on OpenStreetMap - Population
- 599 (ZCTA, ACS 5-year)
- Population density
- 1 / sq mi
- Land area
- 627.2 sq mi (1,624.5 km²) (ZCTA, ACS 5-year)
- Median household income
- $57,831
- Per-capita income
- $20,348
- Median age
- 33.9
- Households
- 183
- Housing units
- 183
- Median gross rent
- $854 / month
- Congressional district
- SD At-large (119th Congress)
- USDA hardiness zone
- 4b (-25 to -20 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Area code
- 605 (from the nearest rate centre)Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.
Tools: compare 57787 with another ZIP · ZIPs within 25 miles · distance from 57787
Map of ZIP code 57787
Climate — monthly normals
Warmest month Jul (avg high 85°F), coldest Jan (avg low 9°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 32 | 35 | 45 | 56 | 66 | 77 | 85 | 85 | 75 | 60 | 46 | 35 |
| Avg low °F | 9 | 11 | 20 | 30 | 41 | 51 | 57 | 54 | 44 | 32 | 20 | 11 |
| Precip in | 0.4 | 0.5 | 0.9 | 2.0 | 3.7 | 3.1 | 2.5 | 1.6 | 1.3 | 1.6 | 0.6 | 0.6 |
NOAA 1991–2020 climate normals from the nearest station: RED OWL (8.6 mi) · NOAA NCEI
Places in ZIP 57787
- 3 schools
- 1 parks
- 1 post offices
- 1 gas stations
- 1 police & fire stations
Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page