After his discharge, Mr. Ermentrout earned a bachelor's degree from Gettysburg College in 1948 and attended the University of Pennsylvania Law School for a year before deciding to go into real estate.
For 44 years, he was a partner with Hugh B. Eastburn Realtors in Newtown. He was past president of the Bucks County Board of Realtors and chaired many of its committees. For 20 years, he taught real estate at Bucks County Community College.
Mr. Ermentrout served on the boards of Planned Parenthood, the Bucks County Community College Authority, the Newtown Improvement Association, the Newtown Exchange Club, and the Committee for the Newtown Bypass.
In 1971, he was the first Democrat to be elected to the Newtown Borough Council and served two terms. Several years earlier, in 1962, he ran for Pennsylvania state representative when his friend James A. Michener, the writer, ran for Congress. Both lost.
Mr. Ermentrout and Michener, who was also a Bucks County native, met after World War II, when Mr. Ermentrout was organizing meetings with veterans trying to fit back into civilian life. Michener later wrote, "We looked to Ermentrout as leader of our group, and I personally found him to be a sensible man, a patriot, and a good fellow to be with."
Mr. Ermentrout established the Southampton-Bucks County Chapter of the American Veterans Committee. He was a founding board member of the James A. Michener Museum in Doylestown, which opened in 1988.
He and his wife had been married since 1952. They met on a getaway weekend in the Poconos, and he offered to drive her home to Hatboro, she said.
Mr. Ermentrout loved Dixieland music and played trombone with the Newtown Mudcats.
He and his wife enjoyed travel abroad. After he retired, they wintered in South Carolina and summered in Maine for 15 years before returning to Newtown in 2010.
In addition to his wife, Mr. Ermentrout is survived by sons George and Jonathan; daughters Betsey King and Laurie; and four grandchildren.
A memorial service will be at 3 p.m. Sunday, March 25, at Swartz-Givnish Funeral Home, 233 E. Washington Ave., Newtown.
Donations may be made to Planned Parenthood of Bucks County, 610 Louis Dr., Warminster, Pa. 18947.
Contact Sally A. Downey
at 215-854-2913 or firstname.lastname@example.org.