99128 Frequently Asked Questions

A: ZIP Code 99128 is Located in Farmington Washington. Portions of 99128 are also in Garfield.

A: ZIP Code 99128 is Located Entirely in Whitman County Washington.

A: The Current Sales Tax in ZIP Code 99128 is 7.9%

A: The Area Code for 99128 is 509.

A: ZIP Code 99128 is in the Washington 5th Congressional District.

A: ZIP Code 99128 is in Washington State House of Representatives District 9.

A: ZIP Code 99128 is in Washington State Senate District 9.

A: The 2022 population of ZIP Code 99128 is 289. The population growth rate in 99128 is 19.75%. The population density of 99128 is 4.

A: The majority race/ethnicity of people residing in 99128 is White (93.92%).

A: The median household income in 99128 is $58,750 (2021) and the average adjusted income is $185,450 (2021).