Opoczno is a town in south-central Poland, within eastern part of Łódź Voivodeship (since 1999), previously in Piotrków Trybunalski Voivodeship (1975–1998). Important communication routes run through the town, namely the Central Rail Line, which connects Silesia and Krakow with Warsaw, and national road number 12, which creates a connection between the Western and Eastern parts of Poland. The town also has a good connection with the Silesia–Warsaw highway. The town and commune have a total area of 190 km², and make one of the largest communes in the Łódź district; 36 thousand inhabitants live here, of which 23,162 (as of 2007) live in Opoczno.