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Zip Code 57481 — Westport, SD

57481 is a ZIP Code associated with Westport, SD, located within Brown. 57481 ranks #9 out of 14 ZIP codes in Brown County by population (and #275 out of 375 in SD). The area supports an estimated population of 271 residents across Data Pending housing units, with a population density of 0.6 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (45.652790, -98.668210)

Data MetricLocal Statistic
Postal / Zip Code57481
Primary CityWestport
State / ProvinceSD
CountyBrown
Total Population271
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density0.6 people/sq mi
TimezoneAmerica/Chicago

How 57481 Compares

MetricZIP 57481Brown CountySD State Average
Population27137,902 (Total)906,188 (Total)
Average ZIP IncomeData PendingN/AN/A
Population Density0.6 /sq mi----
County Pop Rank#9 of 14----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 57426Barnard10.2 mi42N/A
Zip 57441Frederick13.9 mi670N/A
Zip 57401Aberdeen14.0 mi31,939N/A
Zip 57456Leola16.5 mi670N/A
Zip 57433Columbia16.8 mi318N/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 →