Buhl is a city located on the old Oregon Trail in the western half of Twin Falls County, Idaho. The population was 4,122 at the time of the 2010 census, up from 3,985 in 2000. It is part of the Twin Falls, Idaho metropolitan area.

The Twin Falls metropolitan statistical area (MSA), as defined by the United States Census Bureau, is an area consisting of two counties in the Magic Valley region of Idaho, anchored by the city of Twin Falls.