Clarence Harrison DeMar was a U.S. marathoner, winner of seven Boston Marathons, and Bronze medalist at the 1924 Paris Olympics. He was known by the nickname "Mr. DeMarathon."

Madeira is a city in Hamilton County, Ohio, United States. The population was 9,487 at the 2020 census. A residential suburb of Cincinnati, Madeira has a small downtown and some light industry.