Category: Area codes in the United States A state is an organized political community, occupying a territory, and possessing internal and external sovereignty, that enforces a monopoly on the use of force. ... Official language(s) None (English, de-facto) Capital Lansing Largest city Detroit Area  Ranked 11th  - Total 97,990 sq mi (253,793 km²)  - Width 239 miles (385 km)  - Length 491 miles (790 km)  - % water 41. ... Area code 231 was created in the mid 1990s when the area code 616 was split. ... This is the area code for Oakland County, Michigan. ... Area code 313 is the telephone area code serving the city of Detroit, Michigan, and some of the citys innermost suburbs. ... U.S. area code 734 includes the south and west Detroit Metro Area, including Ann Arbor, Ypsilanti, Downriver, and Monroe areas. ... Area code 906 is the telephone area code for the entire Upper Peninsula of Michigan. ... An area code for the sending of telexes to Sierra Leone. ... Sunset on Lake Michigan Lake Michigan is one of the five Great Lakes of North America. ... Area code 219 is a North American Numbering Plan area code for Northwest Indiana that includes Lake and Porter counties. ... A state is an organized political community, occupying a territory, and possessing internal and external sovereignty, that enforces a monopoly on the use of force. ... Official language(s) English Capital Indianapolis Largest city Indianapolis Area  Ranked 38th  - Total 36,418 sq mi (94,321 km²)  - Width 140 miles (225 km)  - Length 270 miles (435 km)  - % water 1. ... Area code 219 is a North American Numbering Plan area code for Northwest Indiana that includes Lake and Porter counties. ... North American Area Code 317 serves the Indianapolis area in central Indiana. ... North American area code 812 includes cities and regions in southern Indiana (Bedford, Bloomington, Columbus, Evansville, Jasper, Jeffersonville, Madison, Mount Vernon, New Albany, Princeton, Seymour, Terre Haute, and Vincennes, among others). ...