New Jersey's Third Legislative District is one of 40 in the state. As of the 2021 apportionment, the district includes the following municipalities:
Gloucester County
- Clayton Borough
- East Greenwich Township
- Elk Township
- Glassboro Borough
- Greenwich Township
- Harrison Township
- Logan Township
- Mantua Township
- National Park Borough
- Paulsboro Borough
- Pitman Borough
- South Harrison Township
- Swedesboro Borough
- Wenonah Borough
- West Deptford Township
- Westville Borough
- Woolwich Township
Salem County
- Alloway Township
- Carneys Point Township
- Elmer Borough
- Elsinboro Township
- Lower Alloways Creek Township
- Mannington Township
- Oldmans Township
- Penns Grove Borough
- Pennsville Township
- Pilesgrove Township
- Pittsgrove Township
- Quinton Township
- Salem City
- Upper Pittsgrove Township
- Woodstown Borough
Cumberland County
- Deerfield Township
- Greenwich Township
- Hopewell Township
- Shiloh Borough
- Stow Creek Township
- Upper Deerfield Township