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is a town in Aroostook County, Maine, United States. The population was 2,361 at the 2000 census. The town is best known for being the home of the Loring Commerce Center (formerly Loring Air Force Base). Tens of thousand of fans of Vermont-based jam-band Phish poured into the site to temporarily make Limestone the most populous town in Maine during individual weekends of the summers of 1997 (The Great Went), 1998 (Lemonwheel) and 2003 (It).
The town is also home to The Maine School of Science and Mathematics, a residential charter high school specializing in math and science education.
According to the United States Census Bureau, the town has a total area of 40.7 square miles (105.4 km²), of which, 40.4 square miles (104.7 km²) of it is land and 0.3 square miles (0.8 km²) of it (0.74%) is water.