Petersham is a town located in Worcester County, in the state of Massachusetts (MA), United States. Nestled in the New England division of the North-east region, it covers an area of 54.2 square miles (140.0 km²) and sits at an elevation of 1080 ft. With a population of approximately 1,180 residents, Petersham offers a peaceful, rural atmosphere.
The town's population is composed of about 50.34% males and 49.66% females, and it has a population density of 21.77 people per square mile (8.41/km²). Petersham lies at a latitude of 42.47 and a longitude of -72.21, operating in the UTC-5.
Locals reflect a blend of American ancestry, with roots primarily in United States (0%), followed by English (26.2%), German (11.8%), and Scotch-Irish (0%) heritage. The town is identified by the ZIP code 01366.