The name of the district is derived from its headquarters, Udalguri. The name of “Udalguri”, according to legend, owes its origin to the fact that there were large numbers of “Odal” trees in this region.
Udalguri district, with an area of 1852.16 km was formed on June 14, 2004 as one of the four districts under the Bodoland Territorial Council. This district was carved out by bifurcating Darrang district. Udalguri town is the largest town in the district, with an area of 4.69 sq.km.
This district is home to Rajiv Gandhi Orang National Park, the oldest game reserve in Assam, Bornadi Wildlife Sanctuary and Bhairabkunda.