A study of the prevalence of intestinal parasites on the population of São Tomé, RN - Brazil, is presented. Passed stool was examined by using Hoffman, Pons and Janer method. The prevalence of intestinal parasites is related to some environmental features. Simple random sampling technique wasapplied. Among 550 examined persons, 495 were infected by intestinal parasites (90%). The prevalence of the various parasites was: E. histolytica, 39,2%; E. coli, 59,8%; G. lamblia, 12,9%; A. lumbricoides, 23,8%; T. trichiurus, 9,2%; Ancylostomydae, 7,8%; H. nana, 12%; E. vermiculares, 2,9%.