[19] Newfield was formed as a borough by the New Jersey Legislature on March 8, 1924, from portions of Franklin Township, based on the results of a referendum held on April 1, 1924.

[20] In the weeks before the legislature approved the formation of the borough, a group of 240 residents traveled to Trenton by train to lobby on behalf of the creation of an independent municipality.

[23][24][25] The 2010 United States census counted 1,553 people, 579 households, and 453 families in the borough.

[31] As of the 2000 United States Census,[14] there were 1,616 people, 596 households, and 470 families residing in the borough.

17.6% of all households were made up of individuals, and 9.1% had someone living alone who was 65 years of age or older.

[5] The borough form of government used by Newfield 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.

[34][35] As of 2025[update], the mayor of Newfield Borough is Republican Charles Grova Jr., whose term of office ends December 31, 2026.

[36] Members of the Newfield Borough Council are Council President Michael Carrow (R, 2026), Thomas D. Corwonski (D, 2025), Joseph Curcoio III (D, 2026), Jennifer Marandino (2025), Scott C. Miller (D, 2027) and Christina Renzi (R, 2027).

[3][37][38][39][40][41] Resident committees were formed in September 2013, which announced that they would mount a petition drive to recall council members Michael Carrow and Everett Marshall III, in the wake of a conflict between the borough council and the volunteer fire department, in which the council passed an ordinance giving the borough control over the fire department and in response the fire company threatened to close in October if the ordinance wasn't overturned.

[42] In January 2015, the borough council selected Stephen Boyle from a list of three candidates nominated by the Republican municipal committee to fill the vacant council seat expiring in December 2016 that had been held by Donald Sullivan until he took office as mayor.

[44] In August 2019, Christina Pierce was appointed by the borough council to fill the seat expiring in December 2021 that had been held by Patricia M.

[48][49][50] For the 119th United States Congress, New Jersey's 2nd congressional district is represented by Jeff Van Drew (R, Dennis Township).

[52] For the 2024-2025 session, the 3rd legislative district of the New Jersey Legislature is represented in the State Senate by John Burzichelli (D, Paulsboro) and in the General Assembly by David Bailey (D, Woodstown) and Heather Simmons (D, Glassboro).

[84][85] Students in public school for kindergarten through sixth grade attend the Franklin Township Public Schools, as part of a sending/receiving relationship in which Newfield accounts for about 100 of the more than 1,400 students in the district.

two schools, had an enrollment of 1,661 students and 123.8 classroom teachers (on an FTE basis), for a student–teacher ratio of 13.4:1.

[104] Notre Dame Regional School of the Roman Catholic Diocese of Camden had one of its two campuses in Newfield, with the other in Landisville in Buena.

[104] That year remnants of the school formed the non-Catholic Edgarton Christian Academy.