Surveyed 150 inmates from Jordanian prisons to determine the most commonly committed crimes and the social, economic, environmental, and demographic factors having the greatest influence on their occurrence. Crime is perceived as an increasing phenomenon in Jordan and is attributed to changes in a developing society. Results show that the most prevalent crimes in Jordan are murder, theft, embezzlement, bad checks, disgraceful conduct, army desertion, and taking and selling drugs. Crimes occur most frequently in urban slums. Most Ss were characterized by low economic standing and illiteracy, were young, and were unmarried and of laborer status. Recent emigration to urban areas and frequent movement within urban areas also factored heavily. Young Ss committed as much embezzlement, bad check passing, and drug use and selling as did older Ss, but young and uneducated Ss committed more murder, theft, disgraceful conduct, and army desertion. Educated Ss committed more embezzlement and bad check passing. Unmarried Ss committed more theft, disgraceful conduct, and desertion, while married Ss committed more embezzlement, murder, drug dealing, and bad check passing.