This map shows an aerial view of the proposed Tall Tree subdivision in western St. Charles County, shown in color. Frontier Middle School and the city of O'Fallon, Missouri are to the north.

This map shows an aerial view of the proposed Tall Tree subdivision in western St. Charles County, shown in color. Frontier Middle School and the city of O'Fallon, Missouri, are to the north.

ST. CHARLES, Mo. – Voters in St. Charles County will want to double-check their polling location before the Missouri primary election on Aug. 2.