In 2004 Parisi was elected to represent Wisconsin's 48th Assembly district.The district encompasses McFarland, Monona, the Towns of Blooming Grove and Dunn and the far eastern portion of the City of Madison.

Land used in the district ranges from high-intensity urban and heavy industrial to natural areas as well as several miles of Lake Monona shoreline.

He was assigned to the standing committees on aging and long-term care, on agriculture, on budget review, on corrections and the courts, and on local and urban affairs.

[5] His work in the State Assembly focused on criminal justice, ending domestic abuse and sexual assault and workforce development.

[10] He was re-elected to a third full term on April 6, 2021, defeating Mary Ann Nicholson, an accountant who suspended her campaign after her husband's death but remained on the ballot.