St. Matthews is a city in eastern Jefferson County, Kentucky, United States. The population was 15,852 at the 2000 census. As of 2004, the population recorded by the U.S. Census Bureau is 17,374. When the government of Jefferson County merged with the city of Louisville, Kentucky in 2003, citizens of St. Matthews also became citizens of the new Louisville Metro, however, none of the incorporated places in Jefferson County were affected. St. Matthews apartments for rent comparison page shows most up to date rent information on St. Matthews apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.