If available, see below for a list of known police frequencies for Castlewood, South Dakota. Or, navigate to another city or town within Hamlin County, to view the local police frequencies.
| Bryant | Castlewood | Estelline | Hayti | |
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| Hazel | Lake Norden | Lake Poinsett | ||
Detect police activity and stay ticket-free in Castlewood, South Dakota with these police radar detectors.