The Miami Valley is the land area surrounding the Great Miami River in southwest Ohio, USA, and includes the Little Miami, Mad, and Stillwater rivers as well. Geographically, it includes Dayton, Springfield, Middletown, Hamilton, and other communities. The name is derived from the Miami Indians.
Commonly, however, it refers to the economic and cultural-social region centered on the Greater Dayton area. Middletown and Hamilton both fall under the economic and cultural-social influence of Cincinnati and thus are not commonly included in this sense. Institutions and enterprises in the Dayton area, such as Miami Valley Career Technology Center, Miami Valley Hospital, Miami Valley Young Marines, Miami Valley Council of the Boy Scouts of America and Miami Valley Storytellers illustrate local usage.
During the mid-twentieth century, among the largest employers in the Valley were Procter & Gamble in Cincinnati, Champion Paper and Fiber in Hamilton, Armco in Middletown, and National Cash Register in Dayton.
Local television stations WDTN, ThinkTV (WPTD and WPTO), WHIO-TV, WKEF and WRGT include the following counties and cities in the cultural Miami Valley:
Additionally, WHIO includes the following locations in its news and weather coverage:
See also: Daytonnati
As Greater Cincinnati grows northward through Butler County, it could conceivably merge with Greater Dayton by 2030, thereby virtually erasing any boundary between the two current Combined Statistical Areas (CSA). As a result, the US Census Bureau could begin reporting the Cincinnati and Dayton metropolitan areas as one by that time, though it would be up to the U.S. Office of Management and Budget to make the merger decision. The new Cincinnati–Dayton metropolitan area would be comparable in size to that of the Orlando–Deltona–Daytona Beach, FL CSA and place it within the top 20 most populous metros in the US, with a population of nearly 3.0 million.