CREATE TABLE table_25582 ("Rank" FLOAT, "Metropolitan area" TEXT, "Principal city" TEXT, "10 , 000+ places" FLOAT, "Densest incorporated place" TEXT, "Density" TEXT)

Name the least 10,000+ places for louisville
SELECT MIN("10,000+ places") FROM table_25582 WHERE "Principal city" = 'Louisville'
SELECT MIN("10,000+ places") FROM "table_25582" WHERE "Principal city" = 'Louisville'