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Zip Code 57266 — Summit, SD

57266 is a ZIP Code associated with Summit, SD, located within Grant. The postal region supports an estimated population of 626 residents across Data Pending housing units, with a population density of 1.9 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (45.286190, -97.089850)

Data MetricLocal Statistic
Postal / Zip Code57266
Primary CitySummit
State / ProvinceSD
CountyGrant
Total Population626
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density1.9 people/sq mi
TimezoneAmerica/Chicago

How 57266 Compares

MetricZIP 57266Grant CountySD State Average
Population6268,747906,188
Median IncomeData PendingN/AN/A
Population Density1.9 /sq mi----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 57256Ortley6.0 mi238N/A
Zip 57251Marvin7.5 mi228N/A
Zip 57273Waubay9.6 mi1,165N/A
Zip 57263South Shore10.8 mi351N/A
Zip 57279Wilmot13.9 mi899N/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 →