TheMiami Valley is the region surrounding theGreat Miami River in southwesternOhio, United States. It also includes theLittle Miami,Mad, andStillwater rivers. The region includes the cities ofDayton,Hamilton,Springfield, andMiddletown, among other communities. The river's name is derived from theMiami people.[1] The name lends itself to many institutions and enterprises in the area, such asMiami University,Miami Valley Career Technology Center, theMiami Valley Conference,Miami Valley Today,Premier Health Miami Valley Hospital, and theMiami Valley Council ofBoy Scouts of America.

During the mid-twentieth century, among the largest employers in the Valley wereProcter & Gamble in Cincinnati,Champion Paper and Fiber in Hamilton,Armco in Middletown, andNational Cash Register in Dayton.[2]
Local television stationsWDTN, ThinkTV (WPTD andWPTO),WHIO-TV,WKEF andWRGT include the following counties and cities in the cultural Miami Valley:
Additionally, WHIO includes the following locations in its news and weather coverage:
AsGreater 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, theUS 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 theOrlando–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.[3]
39°46′07″N84°11′23″W / 39.768611°N 84.189676°W /39.768611; -84.189676