Route 44 was originally designated on 18 May 1953 as National Route 242, and this was redesignated as Route 44 when the route was promoted to a Class 1 highway.
Overlapping sections
From the origin to Kitaodori 5-chome intersection, Kushiro City: Route 38
From the origin to Kiba 3-chome intersection, Kushiro City: Route 391
From the origin to Beppo intersection, Kushiro Town: Route 272
History
18 May 1953 - Second Class National Highway 242 (from Kushiro to Nemuro)
1 April 1963 - First Class National Highway 44 (from Kushiro to Nemuro)
1 April 1965 - General National Highway 44 (from Kushiro to Nemuro)
^"一般国道の路線別、都道府県別道路現況" [Road statistics by General National Highway route and prefecture] (PDF) (in Japanese). Ministry of Land, Infrastructure, Transport and Tourism. Retrieved 19 February 2020.