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Zip Code 57646 — Mound City, SD

57646 is a ZIP Code associated with Mound City, SD, located within Campbell. The postal region supports an estimated population of 272 residents across Data Pending housing units, with a population density of 0.8 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (45.687530, -100.053950)

Data MetricLocal Statistic
Postal / Zip Code57646
Primary CityMound City
State / ProvinceSD
CountyCampbell
Total Population272
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density0.8 people/sq mi
TimezoneAmerica/Chicago

How 57646 Compares

MetricZIP 57646Campbell CountySD State Average
Population2721,494906,188
Median IncomeData PendingN/AN/A
Population Density0.8 /sq mi----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 57632Herreid9.8 mi757N/A
Zip 57631Glenham13.4 mi364N/A
Zip 57452Java14.0 mi136N/A
Zip 57472Selby18.1 mi1,165N/A
Zip 57648Pollock20.9 mi465N/A

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →