Zooplankton plays a vital role in marine pelagic ecosystems that supports higher trophic levels and the imperative determinant of the potential fishery yield. Zooplankton and water samples were collected from 16 GPS fixed locations along the coastal stretch of 42 km on the northeast coast of India during the period 2017-2019. Hydrographical parameters such as temperature, pH, salinity, dissolved oxygen, nutrient (nitrite, nitrate, phosphate, ammonia and silicate) along with biological parameters such as chlorophyll and phytoplankton abundance were observed for better understanding of ecology of zooplankton. For qualitative and quantitative enumeration of zooplankton, different samples were collected with the help of a zooplankton net of mesh size 150 µm with flow meter. All together 13 groups were observed, of which copepods (66.75%) were found dominant followed by Meroplankton (12.13%), Chaetognaths (8.14%) and Appendicularians (4.9%). Total 98 numbers of species were found, out of which 48 were copepods. Mean abundance ranged from 81 nos. per 10m3 to 16801 nos. per 10m3 and average 2083 nos. per 10m3. Zooplankton biomass ranged from 0.15 ml/10m3 to 1.61 ml/10m3 during the study period. Margalef’s richness (d’) varied from 1.86 to 6.97 and the mean is 4.14. The species were evenly distributed and Pielou’s evenness index (J’) ranged from 0.8 to 0.97. Dominant species were Oithona rigida (7.06%), Paracalanus parvus (7.05%), Euterpina acutifrons (6.5%), Sagitta sp. (5.81%), Coryceaus danae (5.37%), Oikopleura sp. (4.9%), Clytemnestra scutellata (4.362%), Oithona brevicornis (3.65%), Acrocalanus gracilis (3.54%) and Oncaea venusta (3.24%). In the study area salinity varied from 7.0 PSU to 20.20 PSU with an average 15.52 PSU and positively correlate with zooplankton biomass (R=0.30, P=ns). Zooplankton biomass and abundance showed negative linear correlation (R=-0.42, P=0.1) and (R=-0.23, P=ns) respectively with phytoplankton abundance as food feeding relation exhibit between them. Its biomass negatively relate with temperature (R=-0.44, P=0.1) and pH (R=-0.45, P=0.1). This study provides baseline information on zooplankton community of this coastal region which could be useful for future environmental monitoring.