Main city: Irene
Timezone: Central / Mountain
Phone type: Landline
Operator: Knology Community Telephone

Irene, a city in Clay, Turner, and Yankton counties in the U.S. state of South Dakota. The population was 420 at the 2010 census. The portion of Irene that is located in Turner County is a part of the Sioux Falls, South Dakota metropolitan area, while the portion located in Yankton County is part of the Yankton Micropolitan Statistical Area. Irene is also host to the Irene Rodeo, held every summer. ^source

North American Area code 605 is the telephone area code serving the entire state of South Dakota, and is one of the area codes that was created in 1947. It is also one of a gradually decreasing number of single-state, single LATA, single area code areas. (North Dakota uses only the 701 area code, but is split into two LATAs, one of which includes Minnesota.) ^source