Red Bank was originally formed as a Town on March 17, 1870, from portions of Shrewsbury Township. On February 14, 1879, Red Bank became Shrewsbury City, a portion of Shrewsbury Township, but this only lasted until May 15, 1879, when Red Bank regained its independence. On March 10, 1908, Red Bank was formed as a borough by an Act of the New Jersey Legislature and was set off from Shrewsbury Township.
As of the census of 2000, there were 11,844 people, 5,201 households, and 2,501 families residing in the borough. The population density was 6,639.1 people per square mile (2,569.1/km²). There were 5,450 housing units at an average density of 3,055.0/sq mi (1,182.2/km²). The racial makeup of the borough was 68.19% White, 20.05% African American, 0.35% Native American, 2.19% Asian, 0.08% Pacific Islander, 6.73% from other races, and 2.41% from two or more races. Hispanic or Latino of any race were 17.11% of the population.
There were 5,201 households out of which 18.0% had children under the age of 18 living with them, 32.2% were married couples living together, 11.6% had a female householder with no husband present, and 51.9% were non-families. 42.9% of all households were made up of individuals and 15.9% had someone living alone who was 65 years of age or older. The average household size was 2.20 and the average family size was 2.99.
In the borough the population was spread out with 17.5% under the age of 18, 8.7% from 18 to 24, 35.2% from 25 to 44, 20.3% from 45 to 64, and 18.3% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 91.8 males. For every 100 females age 18 and over, there were 88.9 males.
The median income for a household in the borough was $47,282, and the median income for a family was $63,333. Males had a median income of $45,922 versus $34,231 for females. The per capita income for the borough was $26,265. About 6.3% of families and 12.0% of the population were below the poverty line, including 16.5% of those under age 18 and 10.6% of those age 65 or over.
New Jersey Transit train service on the North Jersey Coast Line connects the Red Bank train station to Penn Station in New York City and to other locations in New Jersey.
Red Bank is two miles (3 km) east of Interchange 109 of the Garden State Parkway.