The sprawling 23rd District includes 35 communities in Hunterdon, Somerset and Warren counties: Alexandria, Alpha, Bedminster, Bethlehem, Bloomsbury, Bound Brook, Bridgewater, Califon, Clinton, Clinton Township, Franklin (Hunterdon), Frenchtown, Glen Gardner, Greenwich, Hackettstown, Hampton, Harmony, High Bridge, Holland, Kingwood, Lebanon Borough and Lebanon Township, Lopatcong, Mansfield, Milford, Peapack-Gladstone, Phillipsburg, Pohatcong, Raritan Borough, South Bound Brook, Tewksbury, Union, Washington Borough and Washington Township.
Voter registration skews Republican, with 33 percent of registered voters. Democrats comprise 21 percent of those registered, and most of the rest are unaffiliated.
The district is represented by two Republicans, both first elected in 2009. Both are seeking re-election: Assemblymen Erik Peterson is a Flemington attorney and John DiMaio is a contractor from Hackettstown.
Democrats Marybeth Maciag and Maria Rodriguez had filed for their party's nomination, but were knocked off the ballot after Republicans challenged their ballot signatures and a judge found some to be from voters outside the district.