Four swim-school franchises have been ranked on Entrepreneur's Franchise 500.

This represents an increase from last year, when two swim schools made the list. Both placed this year as well. Goldfish Swim School, in Troy, Mich. (45 U.S. franchise locations), ranked 55, compared with last year's 45th place position. British Swim School USA of Fort Lauderdale, Fla. (101 U.S. franchise locations), shot up from 2017's 301 to 121 in 2018.

Other swim schools on the list included SwimLabs Swim School in Lone Tree, Colo. (10 U.S. franchise locations), which placed 301; and SafeSplash Swim School, (66 U.S. franchise locations) also in Lone Tree, at 325.

According to Entrepreneur, more than 1,000 franchises applied for the honor.

The magazine scores companies based on its Five Pillars of the Franchise 500: costs and fees; size and growth; support; brand strength; and financial strength/stability.