which city with the smallest population of all the members of the Council of Europe Chiesa di Sant'Andrea  located?
Chiesa di Sant'Andrea (Serravalle) Chiesa di Sant'Andrea (Serravalle) is a church located in Serravalle, San Marino. It was built in 1824 over the ancient walls of the former city. It belongs to the Roman Catholic Diocese of San Marino-Montefeltro. It was built in 1824. The church was dedicated to St. Andrew and the Virgin Mary.
Roman Catholic Diocese of Lugano The Diocese of Lugano (Latin: "Dioecesis Luganensis") is a diocese in Switzerland covering the canton of Ticino. The diocese is a branch of the Catholic Church immediately subject to the Holy See. In 2004, there were 233,017 baptised of 306,846 inhabitants. It is currently ruled by the Bishop Pier Giacomo Grampa and has as its principal patron St. Charles Borromeo, Archbishop of Milan, and as a secondary patron Saint Sant'Abbondio, Bishop of Como.