| Rank | National Park | Location | Visits in 2006 |
|---|---|---|---|
| 1 | Great Smoky Mountains | Tennessee, North Carolina | 9,289,215 |
| 2 | Grand Canyon | Arizona | 4,279,439 |
| 3 | Yosemite | California | 3,242,644 |
| 4 | Yellowstone | Wyoming, Montana, Idaho | 2,870,295 |
| 5 | Olympic | Washington | 2,749,197 |
| 6 | Rocky Mountain | Colorado | 2,743,676 |
| 7 | Zion | Utah | 2,567,350 |
| 8 | Cuyahoga Valley | Ohio | 2,468,816 |
| 9 | Grand Teton | Wyoming | 2,406,476 |
| 10 | Acadia | Maine | 2,083,588 |