The police recorded 85.6 crimes per 1,000 people a year in Thetford from September 2023 to August 2026, 12% higher than the typical town's 76.2. The most common was violence and sexual offences, at 41.7. In the 12 months to August 2026 it was 80.7, down from 94.1 in the 12 months to August 2024.