Morris Plains, billing itself "the Community of Caring," is a borough in Morris County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 5,532, reflecting an increase of 296 (+5.7%) from the 5,236 counted in the 2000 Census, which had in turn increased by 17 (+0.3%) from the 5,219 counted in the 1990 Census.
Morris Plains was incorporated as a borough by an Act of the New Jersey Legislature on March 15, 1926, from portions of Hanover Township, based on the results of a referendum held on April 15, 1926.
Morris Plains serves as a bedroom community, with many residents traveling to work in New York City. The Morristown Line of New Jersey Transit provides commuters with direct access to New York Penn Station and to Hoboken Terminal.
Morris Plains is also a major base of operations for Pfizer, previously the headquarters for Warner-Lambert. Pfizer also sponsors the Health and Medical Science Academy at Morristown High School and has an annual 5k race around Morris Plains.