Long Island is located in the middle of Casco Bay, approximately three miles from the coast of Falmouth.
In 1993, Long Island seceded from the City of Portland to form its own independent town, comprising Long Island itself and several smaller islands.
A private barge service for vehicles and freight operates between East End Beach in Portland and the Boston Sand & Gravel ramp on Long Island. The lobster-fishing industry is a cornerstone of the island economy, although many islanders also commute to jobs on the mainland.
- Year-round population, 2010 U.S. Census: 230
- Summer population estimate: 1,000
- Acres: 805
- Mainland ferry terminal: Portland
- Estimated distance between mainland and island ferry docks: 4 miles
- Ferry service: Casco Bay Lines
- School: K–5 on island; students commute to Portland for grades 6-12
- Form of town government: Independent town