Category: Area codes in the United States For other countries see Telephone numbering plan. ... The North American Numbering Plan (NANP) is a system for three-digit area codes and seven-digit telephone numbers that direct telephone calls to particular regions on a public switched telephone network (PSTN), where they are further routed by the local network. ... 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 Capital Jefferson City Largest city Kansas City Largest metro area St. ... The area code 314 serves the city of Saint Louis, Missouri, and most suburbs located in Saint Louis County, Missouri. ... The 573 area code covers a large area of the state of Missouri. ... Area Code 319 is a telephone area code for east-central and southeast Iowa. ... Area Code 641 is a telephone area code for a central portion of Iowa. ... Area code 402 is the original telephone numbering plan code for Nebraska in the North American Numbering Plan. ... The 573 area code covers a large area of the state of Missouri. ... 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 Des Moines Largest city Des Moines Area  Ranked 26th  - Total 56,272 sq mi (145,743 km²)  - Width 199 miles (320 km)  - Length 310 miles (500 km)  - % water 0. ... Area Code 319 is a telephone area code for east-central and southeast Iowa. ... Area code 515 servess the state of Iowa. ... Area Code 563 is a telephone area code for a portion the state of Iowa, specifically the east central and northeast corner of the state. ... Area Code 641 is a telephone area code for a central portion of Iowa. ... 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 Topeka Largest city Wichita Area  Ranked 15th  - Total 82,277 sq. ... Area Code 316 is the area code for telephone exchanges in the city of Wichita, Kansas and surrounding communities. ... Area Code 620 is the area code for telephone exchanges in most of southern Kansas, with the exception of the city of Wichita and the surrounding area. ... 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 Lincoln Largest city Omaha Area  Ranked 16th  - Total 77,421 sq mi (200,520 km²)  - Width 210 miles (340 km)  - Length 430 miles (690 km)  - % water 0. ... Area code 308 is the telephone numbering plan code for western Nebraska in the North American Numbering Plan. ... Area code 402 is the original telephone numbering plan code for Nebraska in the North American Numbering Plan. ...