Pennington is a borough in Mercer County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 2,585, reflecting a decline of 111 (-4.1%) from the 2,696 counted in the 2000 Census, which had in turn increased by 159 (+6.3%) from the 2,537 counted in the 1990 Census.
According to an 1883 history, "the first name of the village was Queenstown, which was given it in honor of Queen Anne. Later it was by some, in derision of its comparative insignificance, Pennytown, and as early as 1747 it began to be called Pennington." The name "Penington" was already known in the area, as Edward Penington (1667-1701), son of the British Quaker leader Isaac Penington, was appointed by his kinsman William Penn as Surveyor General of Pennsylvania. His father-in-law was a longtime leader, including as Governor, of the province of West Jersey, where Edward married.
Pennington was established as a borough by an Act of the New Jersey Legislature on January 31, 1890, from portions of Hopewell Township, based on the results of a referendum held on January 21, 1890. It is a dry town, where alcohol cannot be sold.