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OBJECTIVES: This study was carried out to determine the prevalence of malocclusion in 13-15-year-old North Jordanian schoolchildren. METHODS: One thousand and three children aged 13-15 years (619 females, 384 males) were examined using Björk et al. (1964) registration method. A full clinical examination was carried out in the school premises using a mouth mirror under natural lighting. Alginate impressions were then taken for each student together with a wax bite. The impressions were poured the same day by an orthodontic technician. Peri-apical radiographs were taken for the students when hypodontia was suspected. RESULTS: Overall, the prevalence of malocclusion was 92%. Class II and III molars were found in 18.8% and 1.4% of the sample respectively. The malocclusion traits detected were crowding (50.4%), midline shift (31.7%), spaced dentition (26.7%), increased overjet (24.7%), deepbite (16.9%), crossbite (6.8), abnormal tooth form (7.7%), median diastema (6.9%), missing teeth (6%), ectopic canines (5.9%), inverted incisors (5.2%), high frenal attachment (3.9%), openbite (2.9%), tooth impaction (1.8%), reversed overjet (1.9%), scissorbite 0.3%. There was no statistically significant difference between males and females in the overall prevalence of malocclusion and the occlusal traits investigated. However, some dental anomalies showed significant differences. CONCLUSIONS: Prevalence of malocclusion among north Jordanians is comparable with other populations. [ABSTRACT FROM AUTHOR]