Gossaigaon is located at 26°25′11″N 89°59′03″E.[1] It has an average elevation of 50 metres (164 feet). Vegetation is deciduous and evergreen, also grasslands at patches.

As of 2011 India census,[2] The Gossaigaon Municipal Board has a population of 9,068 of which 4,782 are males while 4,286 are females as per report released by Census India 2011.

The population of Children between the ages of 0-6 is 968 which is 10.67% of the total population of Gossaigaon. In Gossaigaon Municipal Board, the Female Sex Ratio is 896 against the state average of 958. Moreover, the Child Sex Ratio in Gossaigaon is around 963 compared to the Assam state average of 962. The literacy rate of Gossaigaon city is 90.21% higher than the state average of 72.19%. In Gossaigaon, Male literacy is around 93.94% while the female literacy rate is 86.01%.

Gossaigaon Municipal Board has total administration of over 1,935 houses to which it supplies basic amenities like water and sewerage. It is also authorized to build roads within Town Committee limits and impose taxes on properties coming under its jurisdiction.

Most of the residents are members of Scheduled Tribe(P), followed by religious minority communities, then the Adivasi people.