Princeton is a borough in Mercer County, in the U.S. state of New Jersey. It was established on January 1, 2013, through the consolidation of the Borough of Princeton and Princeton Township, both of which are now defunct. As of the 2020 United States census, the borough's population was 30,681,^[8] an increase of 2,109 (+7.4%) from the 2010 census combined count of 28,572.^[9] In the 2000 census, the two communities had a total population of 30,230, with 14,203 residents in the borough and 16,027 in the township.^[16]

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Princeton, New Jersey
Borough
Lower Pyne building on the corner of Nassau Street and Witherspoon Street, 2015 Nassau Street northbound in Downtown Princeton, 2017 Princeton station, 2020 McCarter Theatre, 2018 Nassau Hall on the campus of Princeton University, 2019 Princeton Battlefield, 2007 Palmer Square, 2013 Institute for Advanced Study, 2023
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Location of Princeton in Mercer County and in New Jersey
Census Bureau map of the former Princeton Township (and enclaved Borough in pink), New Jersey Interactive map of Princeton, New Jersey
Princeton Location in Mercer County Show map of Mercer County, New Jersey Princeton Location in New Jersey Show map of New Jersey Princeton Location in the United States Show map of the United States
Coordinates: 40.358244°N 74.666728°W / 40.358244; -74.666728^[1]^[2]
Country	United States
State	New Jersey
County	Mercer
Incorporated	January 1, 2013
Government
• Type	Borough
• Mayor	Mark Freda (D, term ends December 31, 2024)^[3]^[4]
• Administrator	Bernard Hvozdovic Jr.^[5]
• Municipal clerk	Delores Williams^[6]
Area ^[7]
• Total	18.41 sq mi (47.69 km²)
• Land	17.95 sq mi (46.48 km²)
• Water	0.47 sq mi (1.21 km²) 2.53%
• Rank	154th of 565 in state 6th of 12 in county^[1]
Population (2020)^[8]^[9]
• Total	30,681
• Estimate (2023)^[8]^[10]	30,289
• Rank	78th of 565 in state 5th of 12 in county^[11]
• Density	1,709.6/sq mi (660.1/km²)
• Rank	319th of 565 in state 8th of 12 in county^[11]
Time zone	UTC−05:00 (Eastern (EST))
• Summer (DST)	UTC−04:00 (Eastern (EDT))
ZIP Codes	08540–08544^[12]^[13]
Area code	609^[14]
FIPS code	3402160900^[15]
Website	www.princetonnj.gov

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Princeton was founded before the American Revolutionary War. The borough is the home of Princeton University, one of the world’s most acclaimed research universities, which bears its name and moved to the community in 1756 from the educational institution's previous location in Newark. Although its association with the university is primarily what makes Princeton a college town, other important institutions in the area include the Institute for Advanced Study, Princeton Plasma Physics Laboratory, Princeton Theological Seminary, Opinion Research Corporation, Bristol-Myers Squibb, Siemens Corporate Research, SRI International, FMC Corporation, Educational Testing Service, The Robert Wood Johnson Foundation, Amrep, Church and Dwight, Berlitz International, and Dow Jones & Company.

Princeton is roughly equidistant from New York City and Philadelphia.^[17] It is close to many major highways that serve both cities (e.g., Interstate 95 and U.S. Route 1), and receives major television and radio broadcasts from each. It is also close to Trenton, New Jersey's capital city, New Brunswick and Edison.

The New Jersey governor's official residence has been in Princeton since 1945, when Morven (in what was then Princeton Borough) became the first governor's mansion. In 1982, it was replaced by the larger Drumthwacket, a colonial mansion located in the former township, but not all have actually lived in these houses. Morven became a museum and garden, owned and operated by the New Jersey Historical Society.^[18]

Throughout much of its history, the community was split into two separate municipalities: a township and a borough. The central borough was completely surrounded by the township. The borough seceded from the township in 1894 in a dispute over school taxes; the two municipalities later formed the Princeton Public Schools, and some other public services were conducted together before they were reunited into a single Princeton in January 2013. Princeton Borough contained Nassau Street, the main commercial street, most of the university campus, and incorporated most of the urban area until the postwar suburbanization. The borough and township had roughly equal populations. Major streets include Harrison, Witherspoon, Nassau, Bayard, and Stockton.^[19]