Dang district
Keshav Thackeray played an important role in the Samyukta Maharashtra movement aimed at establishing the linguistic state of Maharashtra. He joined the movement in 1951, demanding the inclusion of the Dang district in Maharashtra instead of neighbouring Gujarat state. He was one of the founding members of the Samyukta Maharashtra Samiti, which campaigned for the formation of Maharashtra and the inclusion of Belgaum and Mumbai in it.