Stool samples were carried out to determine the influence of some factors on the prevalence of helminthosis among primary school children in Zaria between March, 2007 and Febuary , 2009. Faecal Samples were collected from 1,204 children from ages 6-12 years in 20 primary schools randomly selected. The samples were processed using formal ether concentration techniques. Of the 1,204 children examined. 690 (57.3%) of the study population were infected with helminthes. The factors like toilet facilities and personal hygiene were found to influence the prevalence of helminth parasites.