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Zip Code 57223 — Castlewood, SD

ZIP Code 57223 is associated with Castlewood, SD, in Hamlin County. The listed population estimate is 1,429; estimated density is 4.4 people per square mile. Among records with population estimates, it ranks #1 of 5 in Hamlin County and #100 of 372 in SD.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (44.710190, -97.005670)

Data MetricLocal Statistic
Postal / Zip Code57223
Primary CityCastlewood
State / ProvinceSD
CountyHamlin
Total Population1,429
Population Density4.4 people/sq mi
TimezoneAmerica/Chicago

How 57223 Compares

MetricZIP 57223Hamlin County recordsSD records
Population estimate1,4295,138 (sum)906,188 (sum)
Population Density4.4 /sq mi----
County population rank#1 of 5----
State population rank#100 of 372----

Regional sums combine the population estimates in the listed ZIP records; they are not official county or state population totals.

Explore More ZIP Codes

Nearby ZIP Codes in SD

ZIP CodeCityDistancePopulation estimate
ZIP 57234Estelline9.4 mi1,339
ZIP 57241Hayti10.4 mi936
ZIP 57248Lake Norden12.9 mi1,295
ZIP 57238Goodwin13.3 mi315
ZIP 57245Kranzburg13.4 mi151

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 →