Guma is a Local Government Area of Benue State, North Central Nigeria. Its headquarters are in the town of Gbajimba. It has an area of 2,882 …Guma is a Local Government Area of Benue State, North Central Nigeria. Its headquarters are in the town of Gbajimba. It has an area of 2,882 km² and a population of 191,599 at the 2006 census. The postal code of the area is 970.