ZIP code · Custer · South Dakota · United States
ZIP code 57730 — Custer
ZIP code 57730 serves Custer, South Dakota.
- Postal code
- 57730Single source Value from one source, not cross-checked.
- City
- Custer
- County
- Custer FIPS 46033
- State
- South Dakota
- Country
- United States
- Coordinates
- 43.6573, -103.4258 — precision precise (locality)
View on OpenStreetMap - Population
- 5,647 (ZCTA, ACS 5-year)
- Population density
- 11 / sq mi
- Land area
- 516.2 sq mi (1,336.9 km²) (ZCTA, ACS 5-year)
- Median household income
- $81,911
- Per-capita income
- $46,896
- Median age
- 57.6
- Households
- 2,519
- Housing units
- 3,328
- Median home value
- $324,300
- Median gross rent
- $1,070 / month
- Congressional district
- SD At-large (119th Congress)
- USDA hardiness zone
- 5a (-20 to -15 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/Denver (UTC−7 / UTC−6 DST)
- Area code
- 605Telephone 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 57730 with another ZIP · ZIPs within 25 miles · distance from 57730
Map of ZIP code 57730
Climate — monthly normals
Warmest month Jul (avg high 85°F), coldest Jan (avg low 15°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 40 | 41 | 50 | 58 | 66 | 77 | 85 | 84 | 76 | 61 | 48 | 39 |
| Avg low °F | 15 | 16 | 24 | 31 | 41 | 50 | 57 | 55 | 46 | 34 | 23 | 15 |
| Precip in | 0.5 | 0.7 | 1.1 | 2.3 | 3.7 | 3.3 | 3.0 | 2.3 | 1.5 | 1.6 | 0.7 | 0.5 |
NOAA 1991–2020 climate normals from the nearest station: WIND CAVE (7.5 mi) · NOAA NCEI
Places in ZIP 57730
- 10 schools
- 1 hospitals & clinics
- 1 doctors & dentists
- 1 pharmacies
- 1 supermarkets
- 28 restaurants & cafés
- 1 bars & pubs
- 10 parks
- 9 playgrounds
- 1 libraries
- 2 post offices
- 5 places of worship
- 2 banks
- 5 gas stations
- 2 EV charging 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