There are 4 zip codes in DeKalb County, Tennessee. The most populated is 37166, located in Smithville. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
3716614,051Smithville
370122,340Alexandria
370952,279Liberty
370591,588Dowelltown

Zip Codes in DeKalb County, Tennessee by Population (2024)