[8] Altamont is located in southern Klamath County at 4,144 feet (1,263 m) above sea level.

[7] It is bordered to the north and west by the city of Klamath Falls, the county seat.

Oregon Route 39 passes through the center of the community as South 6th Street and the Crater Lake Parkway, while Oregon Route 140 (Southside Expressway) runs along the southern edge of the community.

According to the United States Census Bureau, the Altamont CDP has a total area of 8.1 square miles (21.0 km2), all land.

The racial makeup of the CDP was: 6.76% of the population were Hispanic or Latino of any race.