Time in South Dakota Time in South Dakota South Dakota lies in both the Mountain Time Zone and the Central Time Zone. Mountain Time roughly contains the western half of the state, but not all of it. Rapid City is the largest city in the Mountain Time portion of the state. Central Time contains the eastern half of the state and roughly more of the state than the Mountain Time Zone and includes the state capital Pierre and the largest city, Sioux Falls. The 2 zones for South Dakota as given by zone.tab of the IANA time zone database. Columns marked * are from
South Dakota Highway 253 system of highways important to the nation's defense, economy, and mobility. The Unofficial South Dakota Highways Page South Dakota Highway 253 South Dakota Highway 253 (SD 253) is an state highway in the north-central part of the U.S. state of South Dakota. It exists entirely within Edmunds County, from U.S. Route 12 (US 12) west of Roscoe to SD 47 north of Bowdle. The route is maintained by the South Dakota Department of Transportation (SDDOT) and is not a part of the National Highway System. SD 253 begins at an intersection with US 12 near Gretna and heads north through