In the letter, BJP state office bearers said that the State Election Commission (SEC) had formally requested the state government to hold the polls preferably on June 25.
However, the state government had not given any response so far, BJP members said.
In addition to that, the party said that at least 500 seats had fallen vacant in different panchayats along with the panchayats under North Bengal and Siliguri.
BJP said that the party had fared pretty well in a number of seats in the just concluded Lok Sabha polls, adding that it had become a cause of worry for the ruling party in the state.