|Length||968 km (601 mi)|
|East end||Samsi, Purnea (Spur Route|
|States||Uttar Pradesh, Bihar, West Bengal|
|Lalganj, Raebareli, Salon, Pratapgarh, Machhlishahr, Jaunpur, Varanasi, Ghazipur, Ballia, Chhapra, Hajipur,Patna, Bakhtiyarpur, Mokama, Begusarai, Khagaria, Bihpur, Naugachia, Gosaingaon, Kursela, Kora, Katihar, Harishchanderpur, Purnea|
National Highway 31 (NH 31) is a primary national highway in India. It starts from Unnao in Uttar Pradesh and passes through Bihar and terminates at its crossing with State Highway 10 (West Bengal) at Samsi in Malda district of West Bengal. SH 10 (WB) connects Samsi to NH 12.It also has a spur route from Kora to Purnea. 
National highway 31 transits across three states of India in east - west direction.
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