Pernem is located at . It has an average elevation of 47 metres (154 feet).
India census, Pernem had a population of 5285. Males constitute 52% of the population and females 48%. Pernem has an average literacy rate of 74%, higher than the national average of 59.5%: male literacy is 79%, and female literacy is 70%. In Pernem, 10% of the population is under 6 years of age.