Dexter is a city in Dallas County, Iowa, United States. The population was 689 at the 2000 census. It is part of the Des Moines–West Des Moines Metropolitan Statistical Area. Dexter was named after the famous trotting horse Dexter.
Dexter was founded in 1868.
The city is famous for being the site of a July 23, 1933, shootout between members of the Barrow gang and police from as far away as Des Moines. On September 18, 1948, Dexter was the site of a national plowing match at which President Harry Truman delivered a speech attacking the 80th Congress for its record in regard to the American farmer. This speech is considered one of the most important of his 1948 Whistle Stop campaign that turned the tide of the election and returned him to the White House.