The Free Union Church is the oldest existing House of Worship on Fire Island. Ground was broken for the laying of the cornerstone for the Protestant Interdenominational Church in 1917. In late August of 1918 a service of dedication of the building was held.

The church is wooden with high ceilings and currently schedules services each Sunday from Father's Day through Labor Day from 10:45 - 11:30am. Ministers of different denominations come via ferry to preach each week. The average attendance is about 35 worshipers per Sunday.

The Board of Trustees meets three times a year and the church's Raffle and Cake Sale held in July is it's major source of income. Before 1998 the church was called the Union Free Church. Workers discovered the cornerstone stone and noticed the churches name to be Free Union Church. The trustees then voted to change the name back to it's original.