The Coast Transit Authority is the primary provider of mass transportation in the Gulfport–Biloxi metropolitan area.

Service was founded in 1974, after the Mississippi State Legislature passed a bill authorizing the creation of public transit for the region; the area's previous private bus operator, Municipal Transit Lines, had been devastated by Hurricane Camille, and the area was left with no public transportation for a 3-year period after the disaster.

Five park & ride lots are operated by the bureau to increase commuter ridership.

In addition, the Casino Hopper shuttle connects gambling facilities on the Biloxi waterfront.

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