The urban area of Abbotsford is located to the mountain's west, and it is home to a number of Abbotsford's suburban areas, notably Clayburn. In its central portion is the historic community of Straiton,[2] officially named in 1904[3] for Thomas Bell Straiton who founded a homestead on Sumas Mountain in 1893[4] and also a store and post office.[5] Its higher eastern reaches tower over Greendale, a community within the City of Chilliwack and is mostly wilderness; the mountain's summit, Sumas Peak, is located in this area, along with Chadsey Lake.
Sumas Mountain Provincial Park is located in the higher, northern reaches of the mountain. Historic industry on the mountain includes livestock and crop farming, logging, and mining, notably brick-clay, which gave rise to the mining community of Clayburn. Farming,[6] gravel mining,[7] and logging[8] continue on the mountain to the present day. On its south side is the reserve of the Sumas First Nation.
"Sumas" is a Halqemeylem word meaning "a big level opening", referring to the Sumas Prairie area south of the mountain, formerly Sumas Lake. A common 19th Century spelling of Sumas was "Smess"; Simon Fraser's journal recorded the name as "shemotch".