Every NPS unit in Maine.
Maine's 7 NPS units: 2 National Monuments · 1 National Park · 1 National Scenic Trail · 1 Other · 1 International Park · 1 International Historic Site. Combined 5-year-average annual visits: 10,257,971 (multi-state units count their full visits in every state they touch — see methodology). The most-visited unit is Appalachian National Scenic Trail at about 6.22M annual visits.
| Unit | Designation | 5-yr avg visits | Busiest month |
|---|---|---|---|
| Appalachian National Scenic Trail | National Scenic TrailAPPA | 6,215,118 | July |
| Acadia National Park | National ParkACAD | 3,992,045 | August |
| Katahdin Woods and Waters National Monument | National MonumentKAWW | 38,036 | February |
| Saint Croix Island International Historic Site | International Historic SiteSACR | 12,772 | August |
| Frances Perkins National Monument | National MonumentFRPE | — | — |
| Maine Acadian Culture | —MAAC | — | — |
| Roosevelt Campobello International Park | International ParkROCA | — | — |
Methodology
Unit list and per-unit visit counts come from the official NPS Visitor Use Statistics Data Package, 2025. The "5-year average visits" column is the mean of 2021-2025 Recreation Visits. Multi-state NPS units (Yellowstone, Death Valley, Great Smoky Mountains and others) are listed under every state they touch; the per-unit visit count is the unit's total, not a per-state share. Independent site, not affiliated with the National Park Service.
Independent site. Not affiliated with or endorsed by the National Park Service. Data comes from the official NPS Visitor Use Statistics Data Package, 2025; editorial analysis is ours. The NPS Arrowhead and other NPS marks are not used.