Trogir is a port town on the Adriatic coast in Split-Dalmatia County, Croatia. In 2011, 10,923 people lived there. Trogir is on a small island between the Croatian mainland and the island of Čiovo. It is 27 km (17 mi) west of Split. Since 1997, the historic centre of Trogir was added as a UNESCO World Heritage Site for its Venetian architecture. It is the largest building is the church of St. Lawrence.