1969 - Stone Row, 314-330 South Main placed on the National Register of Historic Places.
1970 - Historic District added to the National Register of Historic Places.
1972 - Newbill - McElhiny House, 625 South Main placed on the National Register.
1980 - Old City Hall, recognized as Market House, 100 South Main placed on the Register.
1987 - St. Charles Odd Fellows Hall, 117 South Main placed on the National Register.
1996 - Historic District boundary increased for 100, 200 and 300 North Main Street.