Daytonnati is a term occasionally used to refer to the region that includes the metropolitan areas of Cincinnati

Cincinnati, Ohio

Cincinnati is a city in the U.S. state of Ohio. Cincinnati is the county seat of Hamilton County. Settled in 1788, the city is located to north of the Ohio River at the Ohio-Kentucky border, near Indiana. The population within city limits is 296,943 according to the 2010 census, making it Ohio's...

 and Dayton

Dayton, Ohio

Dayton is the 6th largest city in the U.S. state of Ohio and the county seat of Montgomery County, the fifth most populous county in the state. The population was 141,527 at the 2010 census. The Dayton Metropolitan Statistical Area had a population of 841,502 in the 2010 census...

 in Ohio

Ohio

Ohio is a Midwestern state in the United States. The 34th largest state by area in the U.S.,it is the 7th‑most populous with over 11.5 million residents, containing several major American cities and seven metropolitan areas with populations of 500,000 or more.The state's capital is Columbus...

. While the United States Census Bureau

United States Census Bureau

The United States Census Bureau is the government agency that is responsible for the United States Census. It also gathers other national demographic and economic data...

 considers each metropolitan area to be an independent entity, some expect the Census Bureau to combine the statistical areas within the next few decades. On satellite photos taken at night, the cities already appear to be linked together.

See also

• Megalopolis (city type)
  Megalopolis (city type)
  A megalopolis is typically defined as a chain of roughly adjacent metropolitan areas. The term was used by Oswald Spengler in his 1918 book, The Decline of the West, and Lewis Mumford in his 1938 book, The Culture of Cities, which described it as the first stage in urban overdevelopment and...
  
  
• ChiPitts

There is no documented evidence of anyone actually referring to the Dayton-Cincinnati area as Daytonnati.