Route 19 is a state highway in Passaic County, New Jersey, United States. Also referred to as the Paterson Peripheral, it runs 3.04 mi (4.89 km) from an intersection with County Route 509 and CR 609 in Clifton north to another intersection with CR 509 in downtown Paterson. Between U.S. Route 46 (US 46) in Clifton and Interstate 80 (I-80) in Paterson, Route 19 is a freeway. The main purpose of the route is to connect the Garden State Parkway to I-80 and downtown Paterson. The road was originally proposed as the Paterson spur of the Garden State Parkway that was to run north to Wayne. In 1959, it was planned to become part of the Paterson Peripheral, an extension of Route 20 from downtown Paterson. By 1971, the road was completed between the Garden State Parkway and I-80, at which time it received the Route 20 designation; the rest was cancelled in 1978 due to feared community disruption. In 1988, this portion of Route 20 became Route 19 as it did not connect with the other segment of the route. In the 1990s, Route 19 was extended to Main Street in downtown Paterson as part of a project that also completed the interchange with I-80.

Passaic County is a county in the U.S. state of New Jersey that is part of the New York metropolitan area. As of the 2020 United States census, the county was the state's eighth-most-populous county, with a population of 524,118, its highest decennial count ever and an increase of 22,892 (+4.6%) from the 2010 census count of 501,226, which in turn reflected an increase of 12,177 (+2.5%) from the 489,049 counted in the 2000 census. The most populous place in Passaic County is Paterson, with 159,732 residents at the 2020 Census, more than 30% of the county's population, while West Milford covered 80.32 square miles (208.0 km2), the largest total area of any municipality and more than 40% of the county's area. The county is part of the North Jersey region of the state.