Neilton is an unincorporated community and census-designated place (CDP) in Grays Harbor County, Washington, United States.

[4] Neilton is located in northern Grays Harbor County within Olympic National Forest along U.S. Route 101.

According to the United States Census Bureau, the Neilton CDP has a total area of 9.7 square miles (25.0 km2), all of it land.

[4] The climate in this area has mild differences between highs and lows, and there is adequate rainfall year-round.

19.5% of all households were made up of individuals, and 8.6% had someone living alone who was 65 years of age or older.