Perth Amboy was formed by Royal Charter on August 4, 1718, within various townships. Perth Amboy was chartered as a city by an Act of the New Jersey Legislature on December 21, 1784, within Perth Amboy Township and from part of Woodbridge Township. Perth Amboy Township was formed on October 31, 1693, and was enlarged during the 1720s to encompass Perth Amboy city. Perth Amboy Township was incorporated as one of New Jersey's initial 104 townships on February 21, 1798. The township was absorbed by Perth Amboy city on April 8, 1844.
Perth Amboy, and South Amboy across the Raritan River, are collectively referred to as The Amboys. Signage for Exit 11 on the New Jersey Turnpike refers to "The Amboys" as a destination. The Amboys are the northern limit of the area informally referred to as the Bayshore.
As of the census of 2000, there were 47,303 people, 14,562 households, and 10,761 families residing in the city. The population density was 9,892.0 people per square mile (3,820.9/km²). There were 15,236 housing units at an average density of 3,186.2/sq mi (1,230.7/km²). The racial makeup of the city was 46.41% White, 10.04% African American, 0.70% Native American, 1.53% Asian, 0.13% Pacific Islander, 35.59% from other races, and 5.61% from two or more races. Hispanic or Latino of any race were 69.83% of the population. Most of the Hispanics in Perth Amboy are of Puerto Rican or Dominican descent but all Latino nationalities are represented in the city.
There were 14,562 households out of which 40.3% had children under the age of 18 living with them, 44.6% were married couples living together, 21.0% had a female householder with no husband present, and 26.1% were non-families. 20.6% of all households were made up of individuals and 8.8% had someone living alone who was 65 years of age or older. The average household size was 3.20 and the average family size was 3.63.
In the city the population was spread out with 28.5% under the age of 18, 11.4% from 18 to 24, 31.6% from 25 to 44, 18.3% from 45 to 64, and 10.2% who were 65 years of age or older. The median age was 31 years. For every 100 females there were 98.2 males. For every 100 females age 18 and over, there were 94.8 males.
The median income for a household in the city was $37,608, and the median income for a family was $40,740. Males had a median income of $29,399 versus $21,954 for females. The per capita income for the city was $14,989. About 14.3% of families and 17.6% of the population were below the poverty line, including 24.1% of those under age 18 and 12.8% of those age 65 or over.
In 2000, 27.79% of Perth Amboy residents identified themselves as being of Puerto Rican ancestry, the fifth highest concentration of Puerto Ricans on the U.S. mainland of those municipalities with 1,000 or more residents identifying their ancestry. In the same census, 18.81% of Perth Amboy residents identified themselves as being of Dominican ancestry, the third highest concentration in the country of Dominicans in the United States after Haverstraw, New York and Lawrence, Massachusetts using the same criteria.
The Outerbridge Crossing, a cantilever bridge over the Arthur Kill, connects Perth Amboy with Staten Island. Known locally as the "Outerbridge", it is part of a popular route on NY-440/NJ-440 from the south and west to New York City and Long Island. Despite the assumption that the name is derived from its location as the southernmost bridge in New York State and Staten Island, the Outerbridge Crossing was named in honor of Eugenius H. Outerbridge, first Chairman of the Port Authority. The bridge clears the channel by 145 feet (44 m), providing passage for some of the largest of ships.
The Victory Bridge carries Route 35 over the Raritan River, connecting Perth Amboy on the north with the borough of Sayreville to the south.
The Perth Amboy station provides service on the North Jersey Coast Line to Newark Penn Station, Hoboken Terminal, Secaucus Junction and Pennsylvania Station in Midtown Manhattan.
New Jersey Transit buses serve the Port Authority Bus Terminal on the 116 route, Newark on the 62 line, with local service available on the 813, 815, and 817 bus routes. Perth Amboy also has at least three taxi companies.