Lawrenceville is also known as the village of Lawrenceville as well as the Main Street Historic District, which was listed in the New Jersey and National Registers of Historic Places in 1972, one of the first registered historic districts in New Jersey [1].
As of the census of 2000, there were 4,081 people, 1,747 households, and 1,070 families residing in the CDP. The population density was 1,515.1/km² (3,926.5/mi²). There were 1,776 housing units at an average density of 659.3/km² (1,708.7/mi²). The racial makeup of the CDP was 88.12% White, 3.58% African American, 0.07% Native American, 6.30% Asian, 0.54% from other races, and 1.40% from two or more races. Hispanic or Latino of any race were 3.46% of the population.
Of the 1,747 households, 32.2% had children under the age of 18 living with them; 48.7% were married couples living together; 10.5% had a female householder with no husband present; and 38.7% were non-families. 32.3% of all households were made up of individuals and 8.6% had someone living alone who was 65 years of age or older. The average household size was 2.33 and the average family size was 2.99.
In the CDP the population was spread out with 24.2% under the age of 18; 5.8% from 18 to 24; 32.2% from 25 to 44; 27.7% from 45 to 64; and 10.1% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 83.7 males. For every 100 females age 18 and over, there were 77.7 males.
The median income for a household in the CDP was $74,107. The median income for a family was $98,972. Males had a median income of $65,189 versus $37,972 for females. The per capita income for the CDP was $37,919. About 0.6% of families and 1.7% of the population were below the poverty line, including none of those under age 18 and 4.1% of those age 65 or over.