The Rockies.
I'm open to challenge on this, but the Rocky Mountains, the Sierra Nevada Mountains and the Cascade Mountains are essentially tied for second tallest. I think the Sierra Nevada Mountains may technically be the tallest by a smidgin but what's 65 feet when your talking about 14,500. For general interest the Alaska Range is the tallest by a wide margin.
The tallest US mountain is Mt. McKinley in Alaska, which rises 6,194 meters (20,320 feet). The tallest Middle Eastern mountains are Mt. Damavand in Iran at 5,610 meters (18,406 ft) and Mt. Ararat in Turkey at 5,137 meters (16,854 feet). If only mountains in the 48 continental states are counted, Mt. Whitney in California is the tallest US mountain at 4,421 meters (14,505 feet). However, outside of Turkey, Iran and northern Iraq, there are few true mountains in the Middle East, unlike the United States which has numerous mountain ranges.
Mount Whitney The highest peak in the continental US
Mt. Foraker in Alaska is the third tallest mountain in the U.S.
The Blue Ridge Mountains are a physiographic province of the Appalachian Mountains in the northeastern continental US.
Mt. Whitney in California is the tallest mountain in the continental USA. It is about 14,505 ft (4421m) tall. The tallest mountain in the USA is Mt. Mckinley in Alaska at 20,320 ft (6194m).
Mount Whitney is located in California. It is 14,505 feet above sea level. It is part of the Sierra Nevada mountain range.
Mount Whitney in the Eastern Sierra Nevada Mountains. Altitude: 14,495ft.
The Blue Ridge Mountains are a physiographic province of the Appalachian Mountains in the northeastern continental US.
THE GEORGIA MOUNTAIN RANGE
The tallest mountain in the continental United States (ignoring the first 10 in Alaska) is Mount Whitney in California at 14,505 feet.