We have ranked 5 areas in Tjörn by safety index — reported crime relative to how many people live and work in each area. Tjörn sydväst ranks highest with 78 out of 100.
| # | Area | Safety | Bovisi Index |
|---|---|---|---|
| 1 | Tjörn sydväst | 78 | 69 |
| 2 | Skärhamn norra | 68 | 68 |
| 3 | Tjörns omland | 64 | 58 |
| 4 | Tjörn öster | 64 | 68 |
| 5 | Kållekärr | 61 | 69 |
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93% of residents in Tjörn feel safe outdoors after dark (Kolada citizen survey, 2025). The figure covers the whole municipality and complements the ranking, which is based on reported crime.
The safety index is based on reported crime per DeSO area (2024–2025 average), measured against how many people actually spend time there: residents, one third of the daytime population and an estimate of visitors based on the number of nearby restaurants and bars. This gives city centres and nightlife areas, where many people spend time but few live, a fairer figure. The index measures reported crime — not how safe people feel, and not the police assessment of vulnerable areas.
Tjörn sydväst has the highest safety index in Tjörn (78 out of 100), followed by Skärhamn norra and Tjörns omland. The ranking is based on reported crime relative to residents and daytime population.
The number of reported crimes in the area per 100,000 people, counting residents, the daytime population and an estimate of visitors. The index runs from 0 to 100, where higher is safer. It says nothing about individual streets or how safe people feel.