He married Gertrude Goodwin, 11 January 1902, in Somersworth, Strafford County, New Hampshire.(3435) He was of Berwick and she was of South Berwick at the time they were married.
Gertrude was born about 1884, in South Berwick, York County, Maine.(3436) Gertrude was the daughter of Seth Goodwin and Etta Thompson.
Henry Merrill Wallingford and Gertrude Goodwin had the following children:
826 i. Henry10 Wallingford was born in Maine 8 March 1903.(3437) He was age 7 in the 1910 census, born in Maine.
827 ii. Martha Wallingford was born in Berwick, York County, Maine 1 May 1911.(3438)
828 iii. Theodore Wallingford was born in Berwick, York County, Maine 20 July 1921.(3439) Theodore died 30 August 2003, at Wentworth-Douglass Hospital, in Dover, Strafford County, New Hampshire, at 82 years of age.(3440) His obituary mentioned no spouse and said he had no survivors. He attended Berwick schools, was a U.S. Navy veteran of World War II, and worked as a shoe worker in Somersworth, NH for many years. He resided in either Berwick or Somersworth until his last years when he was a resident of Meadow View Manor in Rochester, NH.