The landslides have caused extensive damage to NH 10 (old NH 55A) and NH 55, cutting off road and telecommunication link to Darjeeling and Sikkim.
25 landslips were reported in the three sub-divisions.
18 people have been killed in the landslides and a SSB team has rushed to the affected area, the officer said.
There are also reports of 15 people missing at 8 Mile and 11 Mile areas in Kalimpong.
NH 55 connecting Siliguri, Matigara with Darjeeling was also damaged particularly in Mirik and Rohini areas. A bridge on NH 55 has been washed away at Nimbujhora.