There is one unique ZIP code in Fort Thompson, South Dakota and it is 57339. Area code: 605.
1
ZIP codes
54.23
sq mi land
10.52
sq mi water
605
area code
Fort Thompson, SD ZIP code map
About Fort Thompson, SD
Fort Thompson is a small community located in Buffalo County, South Dakota, serving as the tribal headquarters of the Crow Creek Sioux Tribe. Situated along the banks of the Missouri River and Lake Sharpe, the town carries deep cultural and historical significance for the Native American communities of central South Dakota. Fort Thompson is assigned the ZIP code 57339 and is reached by callers using the 605 area code, which serves the entirety of South Dakota.
Location & geography
Fort Thompson sits in the heart of central South Dakota, positioned along the eastern shore of Lake Sharpe, a reservoir formed by the Big Bend Dam on the Missouri River. The community is roughly 90 miles northeast of Pierre, the state capital, and approximately 70 miles southwest of Huron, SD. The landscape combines the rolling plains typical of the Great Plains region with significant water features, as the city encompasses 54.23 square miles of land area and an additional 10.52 square miles of water area, reflecting its close relationship with the Missouri River system.
Community & economy
Fort Thompson is a tight-knit, predominantly Native American community centered around the culture, governance, and traditions of the Crow Creek Sioux Tribe. Daily life in the community is closely tied to tribal government services, education through the Crow Creek schools, and activities along the river and lake that provide fishing and recreation for residents. The economy is largely supported by tribal government operations, public services, and some agricultural activity in the surrounding Buffalo County region.
Transportation
Fort Thompson is accessible via South Dakota Highway 47, which serves as a primary route through the community and connects it to neighboring towns across central South Dakota. U.S. Highway 14 can be reached by traveling north toward Highmore, providing broader east-west connectivity across the state. The nearest commercial airport with regular service is Pierre Regional Airport, located approximately 90 miles to the west, offering connections to larger hubs for residents needing air travel.
History
Fort Thompson takes its name from a U.S. Army fort established in the region during the nineteenth century, and the area has been home to the Crow Creek Sioux Tribe for generations. The construction of the Big Bend Dam in the 1960s by the U.S. Army Corps of Engineers created Lake Sharpe and significantly altered the physical and cultural landscape of the community, flooding lands that had long been sacred and inhabited by tribal members. The Crow Creek Sioux Tribe has maintained a sovereign government presence here, and Fort Thompson continues to serve as the administrative and cultural center of the reservation.
Did you know?
Fort Thompson is home to one of the most significant archaeological sites in the Great Plains region — the Crow Creek Massacre site, where the remains of hundreds of Native Americans dating back to approximately 1325 AD were discovered, offering a sobering window into pre-Columbian conflict on the plains. Despite its small size and remote location in one of the least populated counties in the United States, Fort Thompson stands as a living center of Lakota Sioux culture and tribal sovereignty in South Dakota.
