National park acreage statistics
Park acreage statistics for U.S. national parks, compiled by the National Park Service.

National park visitation statistics
Statistical information on the number of recreational visits to U.S. national parks, including tables arranged by park rank, by state, by fiscal year, and by decade. Compiled by the National Park Service.

State park visitation statistics
Statistical data on U.S. state parks, including park acreage and visitation information.