Wenonah was established as a Borough by an act of the New Jersey Legislature on March 10, 1883, from portions of Deptford Township, based on the results of a referendum that was held two days earlier.
Throughout its history, Wenonah has been almost exclusively a residential area. Over 22% of the borough's area is conservation land, which is protected by ordinance from development. Over five miles of hiking trails are threaded around lakes and alongside waterways in these conserved areas.
According to the United States Census Bureau, the borough has a total area of 1.0 square miles (2.5 km²), all of it land.
Wenonah borders Deptford Township and Mantua Township.
There were 844 households out of which 35.3% had children under the age of 18 living with them, 66.4% were married couples living together, 8.6% had a female householder with no husband present, and 22.7% were non-families. 19.7% of all households were made up of individuals and 7.1% had someone living alone who was 65 years of age or older. The average household size was 2.70 and the average family size was 3.13.
In the borough the population was spread out with 25.9% under the age of 18, 5.1% from 18 to 24, 26.0% from 25 to 44, 29.1% from 45 to 64, and 13.8% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 94.9 males. For every 100 females age 18 and over, there were 93.0 males.
The median income for a household in the borough was $71,625, and the median income for a family was $82,505. Males had a median income of $57,381 versus $37,500 for females. The per capita income for the borough was $34,116. About 2.0% of families and 2.5% of the population were below the poverty line, including 2.8% of those under age 18 and 4.3% of those age 65 or over.
The Mayor of the Borough of Wenonah is Thomas Capaldi. Members of the Wenonah Borough Council are Debbie Austin, Stephanie Berenato, Lisa Braun, Philipp Kaeferle , John F. Howard, Carl D. Hausman Jr.
For seventh through twelfth grade, public school students attend Gateway Regional High School, a regional public high school serving students from the boroughs of National Park, Wenonah, Westville and Woodbury Heights, as part of the Gateway Regional High School District.