Hobart is an unincorporated community and census-designated place (CDP) in King County, Washington, United States.

The Hobart area was first settled by loggers in 1879, and originally known as "Vine Maple Valley".

[4] The Hobart Post Office was first opened May 9, 1903 with William Sidebotham as first postmaster.

Hobart is located in central King County and is bordered to the north by Mirrormont, to the northwest by East Renton Highlands, to the southwest by Maple Valley, and to the south by Ravensdale.

The Cedar River runs along the southern and western edges of the community.

The region experiences warm (but not hot) and dry summers, with no average monthly temperatures above 71.6 °F.

14.7% of all households were made up of individuals, and 4.4% had someone living alone who was 65 years of age or older.