I'll start with the two least visited national parks in the U.S.
Gates of the Arctic National Park and Preserve, and Lake Clark National Park and Preserve, are located Alaska. Alaska has 8 national parks, second only to California (9). The most visited national park in the U.S., Great Smoky Mountain N.P., had over 11 million visitors last year. In contrast both these parks had a combined visitation of approximately 24,000.
|Lake Clark NP|