The police recorded 49.7 crimes per 1,000 people a year in Llantwit Major from September 2023 to August 2026, 35% lower than the typical town's 76.2. The most common was violence and sexual offences, at 20.7. In the 12 months to August 2026 it was 51.1, up from 48.8 in the 12 months to August 2024.