Clear Mountain is an outlying suburb of the former Pine Rivers Shire, 20 km north-west of central Brisbane. Its southern border is Cedar Creek, a tributary of the South Pine River. Most of Clear Mountain is an upland, drained southwards by Branch Creek (a tributary of Cedar Creek) and numerous short northerly streams that run into Lake Samsonvale.
The alluvial flats along Branch and Cedar Creeks were taken up for corn and vegetable growing, bananas, pineapples, dairying and piggeries. The Branch Creek primary school opened in 1889 and operated until 1913 while a school at Clear Mountain school opened in 1903 and continued until about 1947.
Clear Mountain Lookout is on the northern boundary, overlooking rural and forested country. Rural/residential subdivisions are in the south-east corner, adjoining similar settlement in Eatons Hill. Clear Mountain's census populations have been:
| Census Date | Population |
|---|---|
| 1933 | 38 |
| 1983 | 292 |
| 2006 | 618 |
| 2011 | 707 |
