As a resident of
North Bergen and at the suggestion of
Nicholas Sacco, he ran for and won a seat as a trustee on the board of education of the
North Bergen School District, serving from 2002 to 2015 and ultimately being chosen as board president, In 2015, he ran with Sacco on a majority Latino slate as a commissioner in North Bergen, serving from 2015 to 2023. He served from 2010 to 2024 on the
New Jersey State Parole Board. In the wake of the
2021 apportionment, the reconfiguration of municipalities in the 33rd and
33rd districts and the incumbent Assembly members in those districts choosing to retire or run for other elective office, the Hudson County Democratic Organization chose newcomers Marenco and
Gabe Rodriguez to run for the two Assembly seats. Marenco and Ramirez defeated independent candidate Lea Sherman, the only other candidate running in the
2023 New Jersey General Assembly election. Marenco was one of 27 members elected for the first time in 2023 to serve in the General Assembly, more than one-third of the seats. In February 2025, Marenco announced that he would drop out of the race for the Democratic nomination, after facing a challenge from
Larry Wainstein, who was running with the support of
Brian P. Stack.
Committees Committee assignments for the
2024—2025 Legislative Session are: • Public Safety and Preparedness • Science, Innovation and Technology • Telecommunications and Utilities
District 33 Each of the 40 districts in the New Jersey Legislature has one representative in the
New Jersey Senate and two members in the
New Jersey General Assembly. The representatives from the 33rd District for the
2024—2025 Legislative Session are: • Senator
Brian P. Stack (D) • Assemblyman Julio Marenco (D) • Assemblywoman
Gabe Rodriguez (D) ==Electoral history==