Carsonville is an unincorporated place in St. Louis County, Missouri. It is located between Interstate 70 and Route 115 at the southeast edge of Berkeley. It is surrounded by Berkeley on the north, Bel-Ridge on the west and south, and Bellerive on the east. St. ... Interstate 70 (abbreviated I-70) is a long interstate highway in the United States. ... Berkeley is a city located in St. ... Bel-Ridge is a village located in St. ... Bellerive is a village located in St. ...