[1][2] The borough borders Closter, Emerson, Norwood, Old Tappan and River Vale.

[23][24][25] The 2010 United States census counted 4,664 people, 1,592 households, and 1,328 families in the borough.

[34] As of the 2000 United States census,[13] there were 4,740 people, 1,563 households, and 1,344 families residing in the borough.

[4] The borough form of government used by Harrington Park is a "weak mayor / strong council" government in which council members act as the legislative body with the mayor presiding at meetings and voting only in the event of a tie.

The mayor can veto ordinances subject to an override by a two-thirds majority vote of the council.

[36][37] As of 2024[update], the position as mayor of Harrington Park is vacant, following the death of Independent Paul A. Hoelscher, whose term of office was set to expire December 31, 2027.

Members of the Harrington Park Borough Council are Council President Diane G. Walker (I, 2025), William Blackinton (I, 2024), Joon L. Chung (I, 2026), Gregory J. Evanella (I, 2025), Allan S. Napolitano (I, 2026) and Jorden "Nick" Pedersen (I, 2024).

[38][39][40][41][42][43] Paul Hoelscher, who had been the borough's mayor since being elected in 1992, died in office in June 2024.

[44] In March 2016, Diane Walker was selected to fill the seat expiring in December 2016 of Michael Rutigliano, who cited personal reasons for his resignation from office the previous month.

[48][49][50] For the 119th United States Congress, New Jersey's 5th congressional district is represented by Josh Gottheimer (D, Wyckoff).

[53] For the 2024–2025 session, the 39th legislative district of the New Jersey Legislature is represented in the State Senate by Holly Schepisi (R, River Vale) and in the General Assembly by Robert Auth (R, Old Tappan) and John V. Azzariti (R, Saddle River).

As of 2025[update], the county executive is James J. Tedesco III (D, Paramus), whose four-year term of office ends December 31, 2026.

[55] Bergen County's Commissioners are: Thomas J. Sullivan Jr. (D, Montvale, 2025),[56] Chair Germaine M. Ortiz (D, Emerson, 2025),[57] Joan Voss (D, Fort Lee, 2026),[58] Vice Chair Mary J. Amoroso (D, Mahwah, 2025),[59] Rafael Marte (D, Bergenfield, 2026),[60] Steven A. Tanelli (D, North Arlington, 2027)[61] and Tracy Silna Zur (D, Franklin Lakes, 2027).

[62][63][64][65][66][67][68][69] Bergen County's constitutional officials are: Clerk John S. Hogan (D, Northvale, 2026),[70][71] Sheriff Anthony Cureton (D, Englewood, 2027)[72][73] and Surrogate Michael R. Dressler (D, Cresskill, 2026).

[77] Among the borough's 2010 Census population, 69.5% (vs. 57.1% in Bergen County) were registered to vote, including 96.5% of those ages 18 and over (vs. 73.7% countywide).

[107][108] Rockland Coaches 20/20T routes provide service to the Port Authority Bus Terminal.