Markham is a census-designated place (CDP) in Grays Harbor County, Washington, United States.

[3] According to the United States Census Bureau, the CDP has a total area of 1.1 square miles (2.9 km2), all of it land.

As of the census[2] of 2000, there were 95 people, 41 households, and 30 families residing in the CDP.

19.5% of all households were made up of individuals, and 2.4% had someone living alone who was 65 years of age or older.

There were no families and 12.3% of the population living below the poverty line, including no under eighteens and 100.0% of those over 64.