[1] As of the 2020 United States census, the district had a population of 227,695, of whom 178,696 (78.5%) were of voting age.

[5] For the 2024-2025 session, the 13th legislative district of the New Jersey Legislature is represented in the New Jersey Senate by Declan O'Scanlon (R, Little Silver) and in the General Assembly by Vicky Flynn (R, Holmdel Township) and Gerard Scharfenberger (R, Middletown Township).

In the interim period between the 1964 Supreme Court decision Reynolds v. Sims which required the creation of state legislature districts to be made as equal in population as possible and the 1973 creation of the 40-district map, the 13th district consisted of all of Bergen County.

[16] In the 2011 redistricting, the 13th district was located entirely in Monmouth County by removing Old Bridge and adding some of boroughs in the northeast corner of the county including Atlantic Highlands, Highlands, Monmouth Beach, and Oceanport.

[1] Helen Chiarello Szabo took office in a November 1976 special election to succeed S. Howard Woodson, who resigned in September 197 6to head the New Jersey Civil Service Commission.