Rosignano Marittimo, the capital of the Municipality, is made up of seven hamlets that are all linked to each other. Castiglioncello, Rosignano Solvay, and Vada are along the coast, from north to south. The hilly towns of Castelnuovo Misericordia, Gabbro, and Nibbiaia are located inland with Rosignano Marittimo.