[22] Roselle Park was incorporated as a borough by an act of the New Jersey Legislature on March 22, 1901, from portions of Union Township.

Galloping Hill Road was continually used by revolutionary war scouts, delivering messages to and from General George Washington and Governor Livingston.

[29] The formation of Roselle Park in 1901 occurred due to a number of grievances based on a lack of sufficient public services, including; lack of a modern sewage system, poor schools, neglected roads, and minimal public safety measures.

[30] In 1907, the first poured concrete building in the world, now the Robert Gordon School, was built in Roselle Park using Edison's revolutionary process.

[31] Roselle Park was home to the factory and lab of Marconi Wireless Telegraph, and in late 1921 became the site of WDY, the first radio broadcasting station licensed in the state of New Jersey.

[1][2] Unincorporated communities, localities and place names located partially or completely within the borough include Lorraine.

[32] The borough is bordered to the northeast by Union Township, to the northwest by Kenilworth, to the east by Elizabeth, to the south by Roselle and to the west by Cranford.

[46][47] As of 2024[update], the mayor of Roselle Park is Democrat Joseph Signorello III, whose term of office ends December 31, 2026.

[3][48][49][50][51] When former mayor and newly elected councilman-at-large Joe DeIorio was sworn into office in January 2018, serving with his husband Fifth Ward Councilman Thos Shipley, they became the first openly gay married couple to serve elected public office together for the same municipality.

[52] On December 4, 2015, Councilwoman Charlene Storey announced that she would resign from here seat effective January 7, 2016, due to her opposition to the council's decision to rename the annual ceremony from "The Tree Lighting" to "The Christmas Tree Lighting", citing issues of establishment of a preferred religion.

[56] In the wake of charges that he had stolen campaign signs from a neighbor's lawn, Fifth Ward Michael Yakubov announced in January 2015 that he would be resigning from office in March.

[57] Richard Templeton was selected by three candidate nominated by the Republican municipal committee and appointed to Yakubov's vacant seat in March 2015, before switching parties and becoming a Democrat five days after he took office.

[65] For the 2024-2025 session, the 22nd legislative district of the New Jersey Legislature is represented in the State Senate by Nicholas Scutari (D, Linden) and in the General Assembly by Linda S. Carter (D, Plainfield) and James J. Kennedy (D, Rahway).

[67] As of 2025[update], Union County's County Commissioners are: Rebecca Williams (D, Plainfield, 2025),[68] Joesph Bodek (D, Linden, 2026),[69] James E. Baker Jr. (D, Rahway, 2027),[70] Michele Delisfort (D, Union Township, 2026),[71] Sergio Granados (D, Elizabeth, 2025),[72] Bette Jane Kowalski (D, Cranford, 2025),[73] Vice Chair Lourdes M. Leon (D, Elizabeth, 2026),[74] Alexander Mirabella (D, Fanwood, 2027)[75] and Chair Kimberly Palmieri-Mouded (D, Westfield, 2027).

[76][77] Constitutional officers elected on a countywide basis are: Clerk Joanne Rajoppi (D, Union Township, 2025),[78][79] Sheriff Peter Corvelli (D, Kenilworth, 2026)[80][81] and Surrogate Christopher E. Hudak (D, Clark, 2027).

The library offers a photocopier and fax service and allows its patrons to reserve and renew materials over the phone and online.

Events such as Homework Help, No Bullying Resources, and Crazy For Crafts, among other things, are offered free of charge and children are encouraged to participate.

[113][114] In parallel, advocates have been pushing for immediate development of the portion of the RVRR Main Line south of Route 22, running past the Galloping Hill Golf Course through Kenilworth and Roselle Park.

The New Jersey Department of Transportation, which owns the railbed, has been working to clear it in anticipation of possible future trail use for pedestrians and cyclists.

This was a result of the Aldene Connection that opened in Roselle Park on April 30, 1967, between tracks of the Central Railroad of New Jersey and the Lehigh Valley Railroad, allowing passengers to travel directly to Newark Penn Station and change there for trains to New York Penn Station, rather than riding to Jersey City and taking ferries into Manhattan.

[119] In January 2015, New Jersey Transit began Raritan Valley service directly to New York Penn Station through the use of dual-powered diesel and overhead electric ALP-45DP locomotives.

Throughout the years as traffic grew, the line would grow to four main tracks, and also offered trains of Reading Company and the Baltimore and Ohio Railroad.

Shuttle service between Bayonne and Cranford continued on until August 1978 but eventually ended, resulting in the closure of the old station on Chestnut Street.

In addition to NJ Transit, the line sees anywhere from 35-45 freight trains per day from three railroads; Conrail, Norfolk Southern, and CSX.

Canadian Pacific (formerly Delaware and Hudson Railway) utilized trackage rights into Oak Island Yard in Newark until 2012.

The line was exempted in 1991 by then Rahway Valley Railroad controller Delaware Otsego Corporation, and was given to the County of Union.

However, beginning in 2004, the Union County Board of Chosen Freeholders began taking steps to reactivate the routes.

They named the Morristown and Erie Railway as designated operator and funded the beginning of right-of-way renewal, though the project has faced opposition from residents who incorrectly believed that the line would be used to transport trash.