[20][21] The name of the creek and township, Lopatcong, has its origin in four words of the Lenape Native Americans, "Lowan peek achtu onk," which means "winter watering place for deer".

The Township's economic data (as is all of Warren County) is calculated by the United States Census Bureau as part of the Allentown-Bethlehem-Easton, PA-NJ Metropolitan Statistical Area.

[39] The 2010 United States census counted 8,014 people, 3,136 households, and 2,089 families in the township.

Of all households, 29.3% were made up of individuals and 13.3% had someone living alone who was 65 years of age or older.

[40] As of the 2000 United States census,[14] there were 5,765 people, 2,143 households, and 1,523 families residing in the township.

[6][42] As of 2022[update], members of the Lopatcong Township Council are Mayor James Mengucci (R, term on committee and as mayor ends December 31, 2020), Council President William D. Wright (R, 2022), Louis Belcaro (R, 2024), Richard McQuade (R, 2024) and James Palitto (R, 2022).

[3][43][44][45][46] In June 2016, the Township Council unanimously selected Yvonne Reitemeyer from a list of three candidates nominated by the Republican municipal committee to fill the seat expiring in December 2016 that became vacant following the resignation of Donna Schneider.

[47][48] In the November 2012 general election, Lori Ciesla, who ran as part of the independent slate of Responsible Lopatcong Leadership, won election, as did Maureen McCabe who won an unexpired one-year term when she defeated Republican incumbent Andrew Horun who had been appointed earlier in the year to fill the vacant seat of H. Matthew Curry.

[51][52][53] Prior to the 2010 Census, Lopatcong Township had been part of the 5th Congressional District, a change made by the New Jersey Redistricting Commission that took effect in January 2013, based on the results of the November 2012 general elections.

[54] For the 119th United States Congress, New Jersey's 7th congressional district is represented by Thomas Kean Jr. (R, Westfield).

[56] For the 2024-2025 session, the 23rd legislative district of the New Jersey Legislature is represented in the State Senate by Doug Steinhardt (R, Lopatcong Township) and in the General Assembly by John DiMaio (R, Hackettstown) and Erik Peterson (R, Franklin Township).

[61][62] Constitutional officers of Warren County are: Clerk Holly Mackey (R, Alpha; 2027),[63][64] Sheriff James McDonald Sr. (R, Phillipsburg; 2025)[65][66] and Surrogate Michael J. Doherty (R, Washington; 2025).

[70] Among the township's 2010 Census population, 64.3% (vs. 62.3% in Warren County) were registered to vote, including 83.6% of those ages 18 and over (vs. 81.5% countywide).

[84][88][89] The site of the new Phillipsburg High School, which began construction in January 2014, is in Lopatcong's borders.

The three-story, 330,000-square-foot (31,000 m2) building, with more than double the floor space of the existing high school and a capacity to accommodate more than 2,100 students, was completed for the 2016–17 school year and was dedicated in September 2016 at ceremonies attended by Governor of New Jersey Chris Christie.

[84][95] Lopatcong Township was featured in a 2003 article in The New York Times, which addressed problems of public school financing in suburban communities and various strategies that Lopatcong and other such communities were adopting to deal with the problem.

The film's writer and director, Glen Tickle, along with members of the cast and crew, are residents of the township.