ZIP code · Morristown · South Dakota · United States
ZIP code 57645 — Morristown
ZIP code 57645 serves Morristown, South Dakota.
- Postal code
- 57645Single source Value from one source, not cross-checked.
- City
- Morristown
- County
- Corson FIPS 46031
- State
- South Dakota
- Country
- United States
- Coordinates
- 45.9386, -101.7232 — precision precise (locality)
View on OpenStreetMap - Population
- 149 (ZCTA, ACS 5-year)
- Population density
- 0 / sq mi
- Land area
- 302.1 sq mi (782.6 km²) (ZCTA, ACS 5-year)
- Median household income
- $73,000
- Per-capita income
- $42,054
- Median age
- 51.1
- Households
- 74
- Housing units
- 93
- Median home value
- $37,100
- 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.
- Time zone
- America/Denver (UTC−7 / UTC−6 DST)
- 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 57645 with another ZIP · ZIPs within 25 miles · distance from 57645
Map of ZIP code 57645
Climate — monthly normals
Warmest month Jul (avg high 85°F), coldest Jan (avg low 6°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 26 | 30 | 43 | 56 | 68 | 77 | 85 | 84 | 74 | 57 | 41 | 30 |
| Avg low °F | 6 | 9 | 19 | 30 | 41 | 51 | 56 | 54 | 45 | 33 | 19 | 10 |
| Precip in | 0.3 | 0.5 | 0.7 | 1.5 | 2.7 | 2.8 | 2.4 | 1.9 | 1.5 | 1.4 | 0.6 | 0.3 |
NOAA 1991–2020 climate normals from the nearest station: PRETTY ROCK (17.6 mi) · NOAA NCEI
Places in ZIP 57645
- 1 schools
- 1 restaurants & cafés
- 1 post offices
- 2 places of worship
- 1 banks
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