Township of Hopewell and Pennington in Mercer County, all of Hunterdon County except East Amwell Township, in Warren County Franklin Township, Greenwich Township, and the Borough and Township of Washington, western Morris County, and Stanhope in Sussex County. For the 1991 redistricting following the 1990 Census, the district shifted to most of Hunterdon County except for some municipalities in the northern part of the county, all of Warren County, and the Mercer County portion remaining unchanged. In the 2001 redistricting, the Mercer County municipalities were eliminated from the 23rd with the district only consisting of Hunterdon County save for Tewksbury Township and Califon and all of Warren County. The district experienced a major change following the 2011 redistricting; the 23rd currently consists of southern Warren County including Phillipsburg, Washington, and Hackettstown, most of northern Hunterdon County, and a spur into Somerset County with Bedminster, Peapack-Gladstone, Bridgewater, Raritan Borough, Bound Brook, and South Bound Brook. Despite the historic Republican nature of Morris County, Democrats swept the three legislative seats up for election in 1973: Stephen B. Wiley, who was also elected in a special election to complete an unexpired Senate term under the old at-large Morris County district, was elected to a four-year Senate term from this district, Gordon MacInnes and Rosemarie Totaro won both Assembly seats as well. MacInnes and Totaro would both be defeated for re-election in 1975 but Totaro would again serve one term in the Assembly after winning in 1977 and MacInnes would later serve four years in the Senate from the geographically similar 25th District in 1993. Governor of New Jersey Brendan Byrne nominated State Senator Wiley to the New Jersey Supreme Court in 1977, his nomination was approved by the Senate, but was rejected by the Supreme Court, which ruled that as Wiley had voted to raise the salary of justices of the Supreme Court in 1974, he could not be appointed to serve on the court until after his term of office expired. Wiley served the remainder of his term in the Senate but was defeated for re-election in 1977 by Republican John H. Dorsey. After the 1981 redistricting, Senator Walter E. Foran and Assemblyman Karl Weidel, who had been elected from the 14th District in the previous election, became representatives from the 23rd. Following the death of Foran in 1986, Dick Zimmer filled the vacant seat in the Senate and William E. Schluter