The country has an area of 271 square miles and population of 108,000. The country consists of 607 islands spread over a 2,000-mile long swath of ocean; diverse languages and cultures exist within each of the country's four states. Several Protestant denominations, as well as the Roman Catholic Church, are present in every state. Most Protestant groups trace their roots to American Congregationalist missionaries. The United Church of Christ is the main Protestant denomination. On the island of Kosrae, the population is approximately 7,800, 95 percent of whom are Protestants. On Pohnpei, the population of 35,000 is evenly divided between Protestants and Catholics. On Chuuk and Yap, an estimated 60 percent are Catholic and 40 percent Protestant. Smaller religious groups include Baptists, Assemblies of God, Salvation Army, Seventh-day Adventists, Jehovah's Witnesses, the Church of Jesus Christ of Latter-day Saints (Mormons), and the Baha'i Faith. There is a small group of Buddhists on Pohnpei, although no Buddhist monks or clergy live on the island. Attendance at religious services is generally high; churches are well-supported by their congregations and play a significant role in civil society.
Most immigrants are Filipino Catholics who have joined local Catholic churches. The Filipino Iglesia Ni Cristo also has a church in Pohnpei.
In the 1890s, on the island of Pohnpei, intermissionary conflicts and the conversion of clan leaders resulted in religious divisions along clan lines which persist today. More Protestants live on the western side of the island, while more Catholics live on the eastern side.