CREATE TABLE table_66418 ("School" TEXT, "Location" TEXT, "Mascot" TEXT, "Enrollment" FLOAT, "IHSAA Class" TEXT, "# / County" TEXT)

Which IHSAA Class has a Location of columbia city?
SELECT "IHSAA Class" FROM table_66418 WHERE "Location" = 'columbia city'
SELECT "IHSAA Class" FROM "table_66418" WHERE "Location" = 'columbia city'