There are 5 zip codes in Franklin County, Washington. The most populated is 99301, located in Pasco. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
9930185,210Pasco
993265,900Connell
993433,522Mesa
99330876Eltopia
99335171Kahlotus

Zip Codes in Franklin County, Washington by Population (2024)