Edmund Dunham was born on July 25, 1661 in Plymouth, Massachusetts to Benajah Dunham and Elizabeth Tilson.

Edmund married Mary Bonham on July 15, 1681 in Piscataway, N.J. The couple had 8 children: Benajah Dunham (1684), Elizabeth Dunham Martin (1689), Edmund Dunham (1690/91), Reverend Jonathan Dunham (1692/93), Ephraim Dunham (1696), Ruth Dunham Thomas (1698), Mary Dunham Smalley (1700), and Hannah Dunham Davis (1704).

Edmund was a members of the First Baptist Church of Piscataway.

“About 1700 or 1701 a number of the members of the Piscataqua Baptist Church in Piscataqua township, Middlesex County, withdrew from that church and formed a separate congregation, observing the seventh day as the Sabbath. They chose a minister and deacon October 11th, 1705, and in the fourth month, 1707, organized a Seventh Day Baptist Church with eighteen members. Edmund Dunham, one of the originators of the church, having been ordained at Westerly, R. I., in 1705, was the first pastor; he had been a lay preacher in the Piscataqua Church since 1689. He continued pastor of the new church until his death, March 7, 1734, in his 72nd year.

Edmund died on March 17, 1733/34.