West Pasco is a census-designated place (CDP) in Franklin County, Washington. The population was 3,739 at the 2010 census. The peak population was in 1980 with 6,210. The population continues to decline in West Pasco because it is being incorporated by the city of Pasco.
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.
West Pasco is located at 46°15′9″N 119°10′58″W (46.252607, -119.182730). According to the United States Census Bureau, the CDP has a total area of 7.2 square miles (18.7 km²), of which, 6.0 square miles (15.6 km²) of it is land and 1.2 square miles (3.1 km²) of it (16.37%) is water.
West Pasco, WA climate is warm during summer when temperatures tend to be in the 70's and very cold during winter when temperatures tend to be in the 30's.
The warmest month of the year is July with an average maximum temperature of 89.30 degrees Fahrenheit, while the coldest month of the year is January with an average minimum temperature of 28.00 degrees Fahrenheit.
Temperature variations between night and day tend to be moderate during summer with a difference that can reach 28 degrees Fahrenheit, and fairly limited during winter with an average difference of 15 degrees Fahrenheit.
The annual average precipitation at West Pasco is 8.01 Inches. Rainfall in is fairly evenly distributed throughout the year. The wettest month of the year is December with an average rainfall of 1.16 Inches.
The median income for a household in the CDP was as of 2009 is $72,923, and the median income for a family was $72,923. Males had a median income of $50,504 versus $31,947 for females. The per capita income for the CDP was $28,523. About 2.2% of families and 2.8% of the population were below the poverty line, including 4.0% of those under age 18 and 2.1% of those age 65 or over.