If available, see below for a list of known police frequencies for Marshall County in Iowa. Or, navigate to your city or town to view your local city and/or police frequencies within Marshall County, Iowa.
| Albion | Clemons | Ferguson | Gilman | |
| Haverhill | Laurel | Le Grand | Liscomb | |
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| Marshalltown | Melbourne | Rhodes | St Anthony | |
| State Center | ||||
Detect police activity and stay ticket-free in Marshall County with these police radar detectors.