About 99020 - Marshall, Washington
99020 is a mid-sized ZIP code covering Marshall in Washington, the United States. This area falls under Marshall County County.
Census data puts the population of this ZIP code at 10,831 residents. It's a quieter, less populous area than the typical Washington ZIP code (avg. ~21,959).
Median household income is about $99,600 (above the Washington average).
Other ZIP code codes in Washington serve areas such as Tacoma, Milton, Seattle.