Borgo Maggiore is one of the 9 communes or "castelli" of San Marino. 6,631 live there (October 2013). It the second largest town of San Marino, after Dogana.
It is next to the San Marino municipalities Serravalle, Domagnano, Faetano, Fiorentino, San Marino, and Acquaviva and the Italian municipality Verucchio. It is at the foot of Monte Titano.