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  •   State: 
    New Jersey
    Mercer County
      County FIPS: 
    40°21′30″N 74°40′00″W
      Area total: 
    18.41 sq mi (47.69 km²)
      Area land: 
    17.95 sq mi (46.48 km²)
      Area water: 
    0.47 sq mi (1.21 km²)
    1724; Incorporated January 1, 2013
  •   Latitude: 
      Dman name cbsa: 
    Trenton-Princeton, NJ
    Eastern Standard Time (EST) UTC-5:00; Eastern Daylight Time (EDT) UTC-4:00
      ZIP codes: 

    Princeton, Mercer County, New Jersey, United States

  •   Population: 
      Population density: 
    1,709.6 residents per square mile of area (660.1/km²)
      Household income: 
      Unemployment rate: 
  •   Sales taxes: 
      Income taxes: 

Princeton is a municipality with a borough form of government 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 2010 United States census, the municipality's population was 28,572, reflecting the former township's population of 16,265, along with the 12,307 in the former borough. The name Princeton was first used in 1724 and became common within the subsequent decade. It is the home of Princeton University, which bears its name and moved to the community in 1756 from its previous location in Newark. Other important institutions in the area include the Institute for Advanced Study, Westminster Choir College, Princeton Plasma Physics Laboratory, Princeton Theological Seminary, Bristol-Myers Squibb, SRI International, FMC Corporation, 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, and receives major television and radio broadcasts from each city. 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. The community was later known by a variety of names, including: Princetown, Prince's Town and finally Princeton. The borough seceded from the township in 1894 in a dispute over school taxes; the two municipalities later formed the Princeton Public Schools.


The Lenape Native Americans were the earliest identifiable inhabitants of the Princeton area. The name Princeton was first used in 1724 and became common within the subsequent decade. In the pivotal Battle of Princeton in January 1777, George Washington forced the British to evacuate southern New Jersey. Princeton hosted the first Legislature under the State Constitution to decide the State's seal, Governor and organization of its government. Two of the original signers of the Declaration of Independence lived in Princeton. The town's population spikes every year during the fall and winter and drops significantly over the course of the summer. According to the 2010 Census, Princeton Borough had 12,307 inhabitants, while Princeton Township had 16,265. Princetonians honored their citizens' legacy by naming two streets in the downtown area after them. On January 10, 1938, Henry Ewing Hale called for a group of citizens to establish a "Historical Society of Princeton" Later the Bainbridge House, constructed in 1766 by Job Stockton, would be dedicated for this purpose. The house is owned by Princeton University and is leased to the Princeton Historical Society for one dollar per year. It has kept its original staircase, flooring and paneled walls. During the most stirring events in its history, Princeton was a wide spot in the road; the boundary between Somerset County and Middlesex County ran right through Princeton, along the road between New York and Philadelphia. When Mercer County was formed in 1838, part of West Windsor Township was added to Princeton Township which was included into the new county.


Cedar Grove, Port Mercer, Princeton Basin, and Jugtown are unincorporated communities that have been absorbed into Greater Princeton over the years. Princeton borders the municipalities of Hopewell Township, Lawrence and West Windsor Townships in Mercer County; Plainsboro Township and South Brunswick Township in Middlesex County; and Franklin Township and Montgomery Township in Somerset County. United States Postal ZIP codes for Princeton include 08540, 08541 (Educational Testing Service), 08542 (largely the old Borough), 0 8543 (PO boxes) and 08544 (the University). Princeton is located at 18.41 square miles (47.69 km²) according to the U.S. Census Bureau, including 17.95square miles (46.48km²) of land and 0.47squaremile (1.21km² of water. The city has a population of 1,788. It is located on the New Jersey Turnpike, which runs from New Jersey to New Jersey's southern tip. The town's population is 1,856. It has a total area of 18.37 square miles, including 1.21 square miles of water (2.53km²), which is 2.53% of the city's total area. Princeton is home to the University of New Jersey, which has an enrollment of more than 2,000 students. It also has a number of other colleges, including Rutgers, Monmouth, and Monmouth County College.


Princeton falls within either a hot-summer humid continental climate (Dfa) or a humid subtropical climate (Cfa) During the summer months, episodes of extreme heat and humidity can occur with heat index values 100 °F (38 °C) On average, the wettest month of the year is July which corresponds with the annual peak in thunderstorm activity. The plant hardiness zone at the Princeton Municipal Court is 6b with an average annual extreme minimum air temperature of 0.9 °C (18.3 °C). The average seasonal (NovemberApril) snowfall total is 24 to 30 inches (610 to 760 mm) and the average snowiest month is February which corresponds to the annual peaked in nor'easter activity. During the winter months, extreme cold and wind can occur. The average annual wind chill value is 0 °F (-18 °C), with wind chill values 0 °C (-18 °C) during winter months. In the summer, the average heat index is 100°F (38°C). In the winter, the temperature can drop to as low as -20°F (-20°C), which is the equivalent of a low of -30°C (-30°F) in the Arctic Circle. In July, there is an average of 3 inches of rain (1.5 mm) of rain in the Princeton area, which is equivalent to 1.6 inches (2.5 inches) of rainfall in the rest of the country.


According to the A. W. Kuchler U.S. potential natural vegetation types, Princeton, New Jersey, would have an Appalachian Oak (104) vegetation type with an Eastern Hardwood Forest (25) vegetation form. The city is located on the New Jersey Turnpike, which runs from New Jersey to New York City. The town has a population of 1.2 million people. It is located in the Garden State region of New Jersey and New York state. It has an area of 2.3 million acres. The area is home to the Princeton High School, which was founded in 1875. It was the first public high school in the United States, and the first in the state to open in 1881. The high school was the site of the first high school to open, which opened in 1883. It closed in 1894. The school was founded by the father of the current mayor of the city, who was also the first mayor of Princeton, Thomas J. Kean, in 1876. The university was founded on the site in 1879. It became the first state university in New Jersey in 1882. It opened its doors in 1884. The campus was named after Kean's father, Thomas Kean; the town was named for Kean. The name Princeton is now the University of Princeton; it is the oldest public university in the U.K. and one of the oldest universities in the world. It also has the largest population of African Americans in the New England region.


According to the website Data USA, Princeton has a population of 30,168 people, of which 85% are US citizens. The ethnic composition of the population is 20,393 White residents (67.6%), 4,636 Asian residents (15.4%), 2,533 Hispanic residents (8.4%) and 1,819 Black residents (6.03%). The most common foreign languages are Chinese (1,800 speakers), Spanish (1,429 speakers), and French (618 speakers) The borough and township had a combined population of 28,572 as of the 2010 United States Census. The borough has a relatively high number of speakers of Scandinavian languages (425 speakers) and Italian (465 speakers) compared to other places. It also has more speakers of German and French than any other borough or township in the U.S. and has a higher percentage of people who are fluent in English than other boroughs and towns. It is the only borough in New Jersey with more than 1,000 English-speaking residents. It has the highest percentage of English-speakers in the United States, followed by New Jersey, New York, New Jersey and New Jersey City. It had the highest proportion of English speakers in the state in the 2010 U.N. Census. It was also the highest in the nation in terms of number of people fluent in French, German, and Scandinavian languages. The town has a high percentage of residents who are of European descent, with 1,800 English speakers and 618 French speakers.

Government and politics

Princeton is governed under the Borough form of New Jersey municipal government. The Mayor is elected directly by the voters to a four-year term of office. The Borough Council is comprised of six members elected to serve three-year terms on a staggered basis. In 2018, Princeton had an average property tax bill of $19,388, the highest in the county. Princeton is located in New Jersey's 12th Congressional District and is part of the 16th state legislative district. Prior to the 2011 Census, the former Princeton Borough and Princeton Township had been in the 15th U.S. Congressional district. New Jersey is represented in the United States Senate by Democrats Cory Booker (Newark) and Bob Menendez (Harrison) and in the New Jersey Legislature by Andrew Zwicker (Mercer County) and Roy Freiman (D, South Brunswick) The mayor presides at Council meetings and votes in the case of a tie or a few other specific cases. The Council approves appointments made by the Mayor. Council Members serve on various boards and committees and act as liaisons to certain Departments, Committees or Boards. The mayor can veto ordinances subject to an override by a two-thirds majority vote of the council. The council has administrative powers and is the policy-making body for Princeton. The borough and township merged on November 8, 2011. The merger was the first in the state since 1997, when Pahaquarry Township voted to consolidate with Hardwick Township The consolidation took effect on January 1, 2013.


Princeton Public Schools serve students in pre-kindergarten through twelfth grade. Students from Cranbury Township attend the district's high school as part of a sending/receiving relationship. The Princeton Charter School (grades K8) operates under a charter granted by the Commissioner of the New Jersey Department of Education. Private schools located in Princeton include The Lewis School of Princeton, Princeton Day School, Princeton Friends School, and Princeton International School of Mathematics and Science (PRISMS) St. Paul's Academy (pre-school to 8th grade) is the oldest co-educational Catholic school in Princeton. Princeton University is one of the world's most prominent research universities. Princeton High School was ranked as the 20th best high school in New Jersey in its 2018 rankings of the "Top Public High Schools" in the state. The school was also ranked the 10th best school in N.J. by U.S. News & World Report. The Institute for Advanced Study maintains extensive land holdings (the "Institute Woods") there covering 800 acres (320 ha) Mercer County Community College in West Windsor is a two-year public college serving Princeton residents and all those from Mercer County. The University of New Jersey was founded in 1746 and relocated to Princeton ten years later. Its James Forrestal satellite campus is located in Plainsboro Township, and some playing fields lie within adjacent West Windsor Township. New Jersey Monthly magazine ranked Princeton University as the top university in the United States.


As of May 2010, the borough had a total of 126.95 miles (204.31 km) of roadways. US 206 and Route 27 pass through Princeton, along with County Routes 583, 526/571 (commonly known as Washington Road) and 533. Other major roads that are accessible outside the municipality include US 1 (in Lawrence, West Windsor & South Brunswick), I-287 (in Franklin), and the New Jersey Turnpike/I-95 (in South Brunswick) The closest commercial airport is Trenton-Mercer Airport in Ewing Township, about 15 miles (24 km) from the center of Princeton. Other nearby major airports are Newark Liberty International Airport and Philadelphia International Airport, located 39 miles (63 km) and 52 miles (84 km) away, respectively.Princeton is roughly equidistant from New York City and Philadelphia. Since the 19th century, it has been connected by rail to both of these cities by the Princeton Branch rail line to the nearby Princeton Junction Station on Amtrak's Northeast Corridor. The Princeton train station was moved from under Blair Hall to a more southerly location on University Place in 1918, and was moved further southeast in 2013. NJ Transit provides shuttle service between the Princeton and Princeton Junction stations; the train is locally called the "Dinky", and has also been known as the "PJ&B" (for "Princeton Junction and Back"). Coach USA Suburban Transit operates frequent daily service to midtown NYC on the 100 route.

Sister cities

Pettoranello del Molise, Italy is a sister city of Colmar, France. Colmar and Molise are twin cities in the Molise region of Italy. The town of Molise is located in the region of Lombardy in the south of the country. The city has a population of more than 1,000,000 and is known as the "Molise capital" of the region. It is also known as one of the most beautiful towns in the world. It was founded in the 12th century and is now known as a UNESCO World Heritage Site. It also has a sister town in Colmar in France, called Colmar-Colmar. It has a twin town in Molise in Italy, known as Pettoranello-Molises. It's also known for its beautiful scenery and is a popular tourist destination. The name Molise means "Molecular" or "Mountain" in Italian and means "mountain" in the local language. It can also be known as Molise or Molise (Molese) in Italian, "Mollise" in English, and "Moolise" or Molises (Mollis) in the Italian language. In Italy, it is also called Molise de Molise and Molises, which means "Mountains of the Molises" or simply "Miles of the Mollis" and is the name of a region in the north of the province of Molises.

Air Quality, Water Quality, Superfund Sites & UV Index

The Air Quality index is in Princeton, Mercer County, New Jersey = 24.8. These Air Quality index is based on annual reports from the EPA. Higher values are better (100=best). The number of ozone alert days is used as an indicator of air quality, as are the amounts of seven pollutants including particulates, carbon monoxide, sulfur dioxide, lead, and volatile organic chemicals. The Water Quality Index is 27. A measure of the quality of an area’s water supply as rated by the EPA. Higher values are better (100=best). The EPA has a complex method of measuring the watershed quality, using 15 indicators such as pollutants, turbidity, sediments, and toxic discharges. The Superfund Sites Index is 30. Higher is better (100=best). Based upon the number and impact of EPA Superfund pollution sites in the county, including spending on the cleanup efforts. The UV Index in Princeton = 4 and is a measure of an area's exposure to the sun's ultraviolet rays. This is most often a combination of sunny weather, altitude, and latitude. The UV Index has been defined by the WHO ( and is uniform worldwide.


The most recent city population of 30,681 individuals with a median age of 41.3 age the population grows by 5.84% in Princeton, Mercer County, New Jersey population since 2000 and are distributed over a density of 1,709.6 residents per square mile of area (660.1/km²). There are average 2.64 people per household in the 6,237 households with an average household income of $118,650 a year. The unemployment rate in Alabama is 7.70% of the available work force and has dropped -4.07% over the most recent 12-month period and the projected change in job supply over the next decade based on migration patterns, economic growth, and other factors will increase by 24.16%. The number of physicians in Princeton per 100,000 population = 309.7.


The annual rainfall in Princeton = 45.5 inches and the annual snowfall = 7.7 inches. The annual number of days with measurable precipitation (over .01 inch) = 100. The average number of days per year that are predominantly sunny = 205. 86 degrees Fahrenheit is the average daily high temperature for the month of July and 22.4 degrees Fahrenheit is the average daily low temperature for the month of January. The Comfort Index (higher=better) is 45, where higher values mean a more pleasant climate. The Comfort Index measure recognizes that humidity by itself isn't the problem. (Have you noticed nobody ever complains about the weather being 'cold and humid?) It's in the summertime that we notice the humidity the most, when it's hot and muggy. Our Comfort Index uses a combination of afternoon summer temperature and humidity to closely predict the effect that the humidity will have on people.

Median Home Cost

The percentage of housing units in Princeton, Mercer County, New Jersey which are owned by the occupant = 67.67%. A housing unit is a house, apartment, mobile home, or room occupied as separate living quarters. The average age of homes = 43 years with median home cost = $462,030 and home appreciation of -6.69%. This is the value of the years most recent home sales data. Its important to note that this is not the average (or arithmetic mean). The median home price is the middle value when you arrange all the sales prices of homes from lowest to highest. This is a better indicator than the average, because the median is not changed as much by a few unusually high or low values. The property tax rate of $27.08 shown here is the rate per $1,000 of home value. If for simplification for example the tax rate is $14.00 and the home value is $250,000, the property tax would be $14.00 x ($250,000/1000), or $3500. This is the 'effective' tax rate.


The local school district spends $8,983 per student. There are 14 students for each teacher in the school, 737 students for each Librarian and 475 students for each Counselor. 2.95% of the area’s population over the age of 25 with an Associate Degree or other 2-year college degree, 27.54% with a master’s degree, Ph.D. or other advanced college degree and 47.74% with high school diplomas or high school equivalency degrees (GEDs).

  • The population development of Princeton, Mercer County, New Jersey.

    Approximately 51.33% female residents and 48.67% male residents live in Princeton, Mercer County, New Jersey.

    As of 2020 in Princeton, Mercer County, New Jersey are married and the remaining 34.06% are single population.

  • 27.9 minutes is the average time that residents in Princeton require for a one-way commute to work. A long commute can have different effects on health. A Gallup poll in the US found that in terms of mental health, long haul commuters are up to 12 percent more likely to experience worry, and ten percent less likely to feel well rested. The Gallup poll also found that of people who commute 61­–90 minutes each day, a whopping one third complained of neck and back pain, compared to less than a quarter of people who only spend ten minutes getting to work.

    61.44% of the working population which commute to work alone in their car, 8.18% of the working population which commutes to work in a carpool, 8.18% of the population that commutes using mass transit, including bus, light rail, subway, and ferry. 9.40% of the population that has their home as their principal place of work.

  • Of the total residential buildings in Princeton, Mercer County, New Jersey, 67.67% are owner-occupied homes, another 28.64% are rented apartments, and the remaining 3.69% are vacant.

  • The 48.33% of the population in Princeton, Mercer County, New Jersey who identify themselves as belonging to a religion are distributed among the following most diverse religions.

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