On the union of the Free Church with the United Presbyterian Church in 1900, the church became known as Clackmannan Mayfield in the Presbytery of Stirling and Dunblane.
In 1932, Clackmannan Mayfield united with Clackmannan St Andrew’s-on-the-Hill and Clackmannan Erskine to form Clackmannan Parish Church in the Presbytery of Stirling and Dunblane; later the Presbytery of Stirling. Following on from the triple union, the congregation moved into the St Andrew’s-on-the-Hill building, but the Free Church still remains at the bottom of Kirk Wynd, though it is now used as a Masonic Hall for Lodge Clackmannan No. 1303.