The first mention of jughandles in the New York Times is on June 14, 1959, referring to jughandles having been built in New Jersey on US 46 in Montville, US 22 between North Plainfield and Bound Brook, and Route 35 at Monmouth Park Racetrack. By the beginning of 1960, New Jersey had 160 jughandles, most if not all standard before-intersection jughandles. The 160th one was on U.S. Route 1 between New Brunswick and Trenton.

is new jersey the only state with jug handles?
yes