In October 2023, Treharris maintained a crime rate of 5.5 per 1,000 residents, significantly lower than the UK average of 8.0 per 1,000—a 31.2% difference. For residents, this translates to a per-capita risk of encountering crime that is roughly one-third lower than the national average. The most frequently reported crimes were violence and sexual offences, accounting for 37.1% of all incidents, followed by criminal damage and arson (17.1%) and anti-social behaviour (11.4%). These figures suggest a mix of persistent challenges and areas of relative safety. The seasonal context of October, with its darker evenings and the timing of Halloween, likely influenced the crime profile, though the exact relationship between these factors and reported incidents remains speculative. The relatively low overall rate may reflect the area’s character as a built-up part of Merthyr Tydfil, where community cohesion and local policing efforts could contribute to a lower crime environment. However, the presence of criminal damage and arson at 1.0 per 1,000—59% above the UK average—highlights a specific vulnerability. This category’s elevation could be linked to factors such as economic pressures or targeted property-related crimes in the area. Meanwhile, the lower-than-average rates for anti-social behaviour (53% below UK levels) and public order offences (15% below) may indicate successful local initiatives or a more stable social environment. For residents, the data underscores that while the risk of experiencing a crime is comparatively low, certain categories remain areas of concern, requiring ongoing attention and community collaboration.