Pittsfield, a town in Somerset County, was incorporated as the town of Warsaw on June 19, 1819 from Plymouth Gore, Sebasticook and Warsaw.

In 1821 it set off land to Twenty Five Mile Pond Plantation (now Burnham).

1824 was an important year for the town as it set off land to Canaan, annexed land from Palmyra, and changed its name to Pittsfield in honor of William Pitts of Boston, a large landowner.

Maine Central Institute, founded in 1866 as a preparatory school for Bates College, is one of the Big 10 private secondary schools in Maine that still serves the public school population as well.

Downtown Pittsfield, on the Sebasticook River, was wiped out by a fire in 1881 and rebuilt immediately. It is at the junction of Maine Routes 11,69, 100 and 152. Interstate 95 passes on the outskirts.