 NY 380 was assigned as part of the 1930 renumbering of state highways in New York and extended from NY 60 north of Jamestown to NY 5 north of Brocton , a routing that remained in place up to and through the 1970s . Although the highway was signed as a state route , most of the route was actually maintained by Chautauqua County . The only section of the route that was maintained by the New York State Department of Transportation was the portion between NY 424 in Stockton and US 20 in Brocton . NY 380 's short overlap with US 20 in Brocton was also state @-@ maintained . 
