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Zip Code 57261 — Roslyn, SD

57261 is a ZIP Code associated with Roslyn, SD, located within Day. 57261 ranks #6 out of 7 ZIP codes in Day County by population (and #270 out of 375 in SD). The area supports an estimated population of 277 residents across Data Pending housing units, with a population density of 1.6 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (45.540510, -97.494120)

Data MetricLocal Statistic
Postal / Zip Code57261
Primary CityRoslyn
State / ProvinceSD
CountyDay
Total Population277
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density1.6 people/sq mi
TimezoneAmerica/Chicago

How 57261 Compares

MetricZIP 57261Day CountySD State Average
Population2775,426 (Total)906,188 (Total)
Average ZIP IncomeData PendingN/AN/A
Population Density1.6 /sq mi----
County Pop Rank#6 of 7----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 57232Eden7.5 mi651N/A
Zip 57239Grenville9.2 mi358N/A
Zip 57247Lake City12.3 mi211N/A
Zip 57468Pierpont12.9 mi279N/A
Zip 57454Langford14.3 mi732N/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 →