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Rockdale, Washington
Ghost town
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Coordinates: 47°23′31″N 121°27′18″W / 47.392°N 121.455°W / 47.392; -121.455
Country	United States
State	Washington
County	King
Established	1912
Elevation	2,500 ft (800 m)
Time zone	UTC-8 (Pacific (PST))
• Summer (DST)	UTC-7 (PDT)

Rockdale is an extinct town in the northwest United States, in King County, Washington. The GNIS classifies it as a populated place.

A post office called "Rockdale" was established 113 years ago in 1912, and remained in operation until 1915. The community in the Cascade Range was named for the abundance of rock near the original town site. Just south of Snoqualmie Pass, it was at the west portal of the Snoqualmie Tunnel, constructed by the Chicago, Milwaukee, St. Paul and Pacific Railroad (The Milwaukee Road) from 1912 to 1914.

The elevation is approximately 2,500 feet (762.0 m) above sea level; it is south of and about 400 feet (120 m) above the eastbound lanes of Interstate 90, formerly U.S. Route 10.

The tunnel and right-of-way is now a rail trail, part of Iron Horse State Park.

References

1. U.S. Geological Survey Geographic Names Information System: Rockdale, Washington
2. "Post Offices". Jim Forte Postal History. Retrieved August 22, 2016.
3. Meany, Edmond S. (1923). Origin of Washington geographic names. Seattle: University of Washington Press. p. 246.

v t e Municipalities and communities of King County, Washington, United States
County seat: Seattle
Cities	Algona Auburn‡ Bellevue Black Diamond Bothell‡ Burien Carnation Clyde Hill Covington Des Moines Duvall Enumclaw Federal Way Issaquah Kenmore Kent Kirkland Lake Forest Park Maple Valley Medina Mercer Island Milton‡ Newcastle Normandy Park North Bend Pacific‡ Redmond Renton Sammamish SeaTac Seattle Shoreline Snoqualmie Tukwila Woodinville
Towns	Beaux Arts Village Hunts Point Skykomish Yarrow Point
CDPs	Ames Lake Baring Boulevard Park Bryn Mawr-Skyway Cottage Lake East Renton Highlands East Hill-Meridian Fairwood Fall City Hobart Klahanie Lake Holm Lake Marcel-Stillwater Lake Morton-Berrydale Lakeland North Lakeland South Maple Heights-Lake Desire Mirrormont Ravensdale Riverbend Riverpoint Riverton Shadow Lake Union Hill-Novelty Hill Vashon White Center Wilderness Rim
Other communities	Bayne Junction Cumberland East Redmond Edgewick Ernie's Grove Grotto High Point Kanaskat Kangley Krain Lisabeula Magnolia Beach Palmer Preston Raeco Selleck Spring Glen Stillwater Veazie Wabash White
Indian reservation	Muckleshoot Reservation‡
Ghost towns	Alpine Barneston Bayne Christopher Foster Franklin Hot Springs Kerriston Lester Monohon Nagrom O'Brien Orillia Osceola Page Rockdale Sheridan Taylor Thomas Wellington Weston
Footnotes	‡This populated place also has portions in an adjacent county or counties
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