As of the 2010 United States Census the district had a population of 215,703, of whom 161,998 were of voting age. The racial makeup of the district was 197,640 White, 4,826 African American, 324 Native American, 6,155 Asian, 51 Pacific Islander, 3,077 from some other race, and 3,630 from two or more races. Hispanic or Latino of any race were 15,059 of the population. The 24th District had 157,204 registered voters as of November 30, 2017, of whom 57,410 were registered as unaffiliated, 63,866 were registered as Republicans, 33,794 were registered as Democrats, and 2,134 were registered to other parties. As of 2000, the district had the fourth-smallest population of any in the state and the third highest land area, making it one of the least densely populated districts in the state. The district has an extremely small minority population, with comparatively few African American, Asian and Hispanic residents, and has the smallest percentage of residents age 65 and over. Registered Republicans outnumber Democrats by a better than 3-1 margin and the district has the highest percentage of registered Republicans and the lowest percentage of Democrats.
When the 1981 redistricting occurred following the results of the 1980 United States Census, State Senator James P. Vreeland and Assembly members Dean Gallo and Leanna Brown were shifted to the 26th Legislative District, with all three winning re-election in their new district. Meanwhile, the old 15th Legislative District essentially became the new 24th District. In the face of difficulties recovering from a stroke he had suffered in October 1988, Wayne Dumont had been in deteriorating health and stepped down from the Senate in July 1990. Assemblyman Robert Littell was chosen by a special convention of Republican committee members from Sussex and Warren Counties to fill Dumont's vacancy in the Senate. In turn, Scott Garrett was chosen to fill Littell's vacant seat in the Assembly. Robert Littell chose not to run for re-election in 2007 and by the time he had left office in 2008 had become the longest-serving legislator in New Jersey history, having served a total of 40 years in office. When his daughter Alison Littell McHose took office in the Assembly in 2004, they became the legislature's first father-daughter combination to serve simultaneously in the legislature. Parker Space took office in March 2013, filling the seat vacated by Gary R. Chiusano, who had been chosen to fill a vacancy as Sussex County Surrogate. On October 17, 2015, Littell McHose resigned her seat to work full-time at her position as Franklin Borough's administrator. Sussex County FreeholderGail Phoebus who had been chosen in the June 2015 primary election to run and was elected in the November general election was appointed to the seat and sworn in late in the legislative term on December 3. Senators and Assembly members elected from the district are as follows:
