[aderwent]

For Columbus I count 17 cities from six states and one province.

Dayton (674,046) - 71 miles
Cincinnati (1,686,744) - 108 miles
Lorain (199,067) - 123 miles
Akron (541,879) - 125 miles
Canton (295,319) - 127 miles
Huntington (200,157) - 133 miles
Toledo (497,952) - 141 miles
Cleveland (1,712,178) - 142 miles
Fort Wayne (335,934) - 155 miles
Youngstown (320,901) - 172 miles
Indianapolis (1,699,881) - 175 miles
Pittsburgh (1,745,039) - 185 miles
Ann Arbor (317,689) - 189 miles
Lexington (315,631) - 189 miles
Detroit (3,776,890) - 202 miles
Windsor (306,519) - 205 miles
Louisville (974,397) - 207 miles