Is Yosemite the Largest U.S. National Park?

No. Yosemite National Park (California) covers 1,187 sq mi (3,074 km²). The largest U.S. national park is Wrangell‑St. Elias National Park and Preserve in Alaska, spanning over 13,000 sq mi (33,600 km²)—more than ten times Yosemite's size. Other larger parks include Gates of the Arctic, Denali, and Katmai, all in Alaska.