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Zip Code 57730 — Custer, SD

57730 is a ZIP Code associated with Custer, SD, located within Custer. 57730 ranks #1 out of 4 ZIP codes in Custer County by population (and #30 out of 375 in SD). The area supports an estimated population of 5,596 residents across Data Pending housing units, with a population density of 4.2 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (43.725610, -103.637330)

Data MetricLocal Statistic
Postal / Zip Code57730
Primary CityCuster
State / ProvinceSD
CountyCuster
Total Population5,596
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density4.2 people/sq mi
TimezoneAmerica/Denver

How 57730 Compares

MetricZIP 57730Custer CountySD State Average
Population5,5968,579 (Total)906,188 (Total)
Average ZIP IncomeData PendingN/AN/A
Population Density4.2 /sq mi----
County Pop Rank#1 of 4----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 57773Pringle9.3 mi206N/A
Zip 57751Keystone14.5 mi893N/A
Zip 57745Hill City21.2 mi1,894N/A
Zip 57702Rapid City24.6 mi35,595N/A
Zip 57747Hot Springs24.6 mi5,839N/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 →