Hamlin was born in
Standish (Richville),
Cumberland County, Maine, Hamlin attended the public schools,
Gorham Normal School, and
Bridgton Academy. He taught school and, in 1900, graduated from
Bowdoin College in
Brunswick, Maine. He served as superintendent of the South Portland and
Cape Elizabeth schools from 1901 to 1925 and as city clerk of
South Portland, Maine in 1913. He engaged in the real estate business at South Portland in 1925. He was also interested in farming. He served as member of the board of registration 1926–1932. He served as mayor in 1933 and 1934. ==Congress==