West Pasco is a census-designated place in Franklin County, Washington, United States. The population was 1,747 at the 2020 census, a significant decrease from 3,739 at the 2010 census. Based on per capita income, one of the more reliable measures of affluence, West Pasco ranks 47th of 522 areas in the state of Washington to be ranked. It is also the highest rank achieved in Franklin County.