Mirrormont is a census-designated place (CDP) in King County, Washington, United States, south of Issaquah.

[2] Within the last decade, the area has seen a shift in development as larger homes have been constructed in Cedar Grove, the Highlands at Tiger Mountain and Mirrormont.

Mirrormont is located in central King County and is bordered to the west by East Renton Highlands and to the south by Hobart.

Part of Tiger Mountain occupies the northeast portion of the CDP.

Washington State Route 18 runs along the southeast edge of the CDP, leading northeast 6 miles (10 km) to Interstate 90 near Snoqualmie and southwest 17 miles (27 km) to Auburn.