Pasco is a city in, and the county seat of, Franklin County, Washington, United States. The population was 77,108 at the 2020 census, and e…Pasco is a city in, and the county seat of, Franklin County, Washington, United States. The population was 77,108 at the 2020 census, and estimated at 80,038 in 2023. Pasco is one of three cities that make up Washington state's Tri-Cities region, a mid-sized metropolitan area of approximately 303,622 people.
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