Each Zonal office is headed by a Regional Director supported by Deputy Directors and secretarial and field staff. Its main function is field data collection for forest inventory, though their functions have expanded to include forest cover mapping of selected states.
The Northern Zone office of FSI is in Shimla with jurisdiction over the States of Jammu and Kashmir, Himachal Pradesh, Uttar Pradesh, Haryana, Punjab, Chandigarh, Rajasthan, Delhi and Uttaranchal. Its mandatory works are: -Carries out forest cover assessment beyond its domain, including a study on household wood consumption in rural Meghalaya (1986-88), preparation of a survey scheme and a field work of survey operation in 1979 in Western Nepal.
The Eastern Zone office of PISFR was created in the year 1974. After the reorganization of PISFR (1981), the office has been functioning as the Eastern Zone office of FSI. Its mandatory works are: -Engaged in inventory of forests and TOF in its area of jurisdiction including Bihar (including present Jharkhand), West Bengal, Odisha, Sikkim, Meghalaya, Tripura, Manipur, Nagaland, Mizoram, Assam, Arunachal Pradesh and the Union Territory of Andaman and Nicobar Islands.
Also collaborated with the Nagaland Forest Department in an inventory project in the State.
The Central Zone office of PISFR was set up at Jagdalpur in 1966 later shifted to Nagpur in 1976.Area under its jurisdiction include the states of Madhya Pradesh (MP), Maharashtra, Chhattisgarh, Gujarat, Goa, Dadra & Nagar Haveli (UT), and Daman & Diu (UT).
Apart from conducting inventory of forests and Trees outside Forests (TOF), it also carries out: -Forest Cover Assessment of Maharashtra, MP, Chhattisgarh, Gujarat and Goa.
Extensive training programs for State Forest Departments (SFDs) in Applicationof Remote Sensing, GIS & GPS in forestry, Inventory techniques, e-Green Watch and Decision Support System (DSS).
The Southern Zone office was established during 1982. Its mandate is to conduct inventory of Forests and TOF in the states of Karnataka, Andhra Pradesh, Kerala, Tamil Nadu (TN) and Telangana. Special studies on Mangroves & TOF inventory in TN has also been carried out by the zone.