Oklahoma City ( (listen)), officially the City of Oklahoma City, and often shortened to OKC, is the capital and largest city of the U.S. state of Oklahoma. The county seat of Oklahoma County, it ranks 22nd among United States cities in population, and is the 11th largest city in the Southern United States. The population grew following the 2010 census and reached 681,054 in the 2020 census. The Oklahoma City metropolitan area had a population of 1,396,445, and the Oklahoma City–Shawnee Combined Statistical Area had a population of 1,469,124, making it Oklahoma's largest municipality and metropolitan area by population. Oklahoma City's city limits extend somewhat into Canadian, Cleveland, and Pottawatomie counties, though much of those areas outside the core Oklahoma County area are suburban tracts or protected rural zones (watershed). The city is the eighth-largest in the United States by area including consolidated city-counties; it is the second-largest, after Houston, not including consolidated cities. The city is also the second largest by area among state capital cities in the United States, after Juneau, Alaska. Oklahoma City has one of the world's largest livestock markets. Oil, natural gas, petroleum products and related industries are its economy's largest sector. The city is in the middle of an active oil field and oil derricks dot the capitol grounds. The federal government employs a large number of workers at Tinker Air Force Base and the United States Department of Transportation's Mike Monroney Aeronautical Center (which house offices of the Federal Aviation Administration and the Transportation Department's Enterprise Service Center, respectively). Oklahoma City is on the I-35 Corridor, one of the primary travel corridors south into neighboring Texas and Mexico and north towards Wichita and Kansas City. Located in the state's Frontier Country region, the city's northeast section lies in an ecological region known as the Cross Timbers. The city was founded during the Land Run of 1889 and grew to a population of over 10,000 within hours of its founding. It was the scene of the April 19, 1995, bombing of the Alfred P. Murrah Federal Building, in which 168 people died, the deadliest terror attack in U.S. history until the attacks of September 11, 2001, and the deadliest act of domestic terrorism in U.S. history. Since weather records have been kept, Oklahoma City has been struck by 13 violent tornadoes, 11 of which were rated F4 or EF4 on the Fujita and Enhanced Fujita scales, and two F5 or EF5.

Edmond is a city in Oklahoma County, Oklahoma, United States, and a part of the Oklahoma City metropolitan area in the central part of the state. The population is approximately 94,054, according to estimates from ESRI. Edmond is the fifth largest city in the state of Oklahoma. The city borders the northern boundary of Oklahoma City. Public transportation is provided by Citylink Edmond bus service.

Central Oklahoma is the geographical name for the central region of the U.S. state of Oklahoma. It is also known by the Oklahoma Department of Tourism designation, Frontier Country, defined as the twelve-county region including Canadian, Grady, Logan, Oklahoma, Cleveland, McClain, Payne, Lincoln, Pottawatomie, Seminole, Okfuskee, and Hughes counties.Central Oklahoma is dominated by the largest urban area in the state, the Greater Oklahoma City area. Oklahoma City is the political, economic, tourism, commercial, industrial, financial, and geographical hub of the state, as well as being its primary cultural center. The only Central Oklahoma city which is not officially considered a suburb of Oklahoma City is Stillwater, Oklahoma.

Norman () is a city in the U.S. state of Oklahoma 20 miles (32 km) south of downtown Oklahoma City. The county seat of Cleveland County and part of the Oklahoma City metropolitan area, its population was 110,925 at the 2010 census. Norman's estimated population of 124,880 in 2019 makes it Oklahoma's third-largest city. Norman was settled during the Land Run of 1889, which opened the former Unassigned Lands of Indian Territory to American pioneer settlement. The city was named in honor of Abner Norman, the area's initial land surveyor, and was formally incorporated on May 13, 1891. Norman has prominent higher education and related research industries, as it is home to the University of Oklahoma, the largest university in the state, with nearly 32,000 students. The university is well known for its sporting events by teams under the banner of the nickname "Sooners," with over 85,000 people routinely attending football games. The university is home to several museums, including the Fred Jones Jr. Museum of Art, which contains the largest collection of French Impressionist art ever given to an American university, as well as the Sam Noble Oklahoma Museum of Natural History. Norman's National Weather Center (NWC) houses a unique collection of university, state, federal, and private sector organizations that work together to improve the understanding of events related to the Earth's atmosphere. Norman lies within Tornado Alley, a geographic region where tornadic activity is particularly frequent and intense. The Oklahoma City metropolitan area, including Norman, is the world's most tornado-prone area. The Storm Prediction Center (SPC), a branch of the National Oceanic and Atmospheric Administration (NOAA), is at the NWC. SPC forecasts severe storm and tornado outbreaks nationwide. Additionally, research is conducted at the co-located National Severe Storms Laboratory (NSSL), which includes field research and operates various experimental weather radars.