Lalganj is located at 25°52′N85°11′E / 25.87°N 85.18°E / 25.87; 85.18. It has an average elevation of 42 metres (137 feet). One of the famous temples in the city is 'Surya Mandir' which is located in the middle of the city. Lalganj is a farser growing town of the vaishali district of Indian state of Bihar. It is 20 km far from Hajipur in north direction. This town is located on the bank of Narayani river.(Gandak River). Lalganj is 40 km far from the capital of bihar. The state highway 74 is going through Lalganj.
As of 2001[update] India census, Lalganj (Hindi: लाल गंज, Urdu: لال گنج) is a town and a nagar panchayat with 61 village panchayats in the Vaishali district of the Indian state of Bihar. It is Located on The bank of Narayani River.