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Devils Tower National MonumentvsEffigy Mounds National Monument

Devils Tower National Monument has a higher Annual Visitors (2025) (515,303 vs 56,912 visitors), while Effigy Mounds National Monument has a higher Total Area (2,526 vs 1,347 acres), while Effigy Mounds National Monument has a higher Longitude (-91 vs -105 °).

Location & Classification

National Monument
Designation
National Monument
WY
State(s)
IA
45
Latitude
43
-105
Longitude
-91

Size & Visitation

1,347
Total Area
2,526
515,303
Annual Visitors (2025)
56,912

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Data sourced from NPS Boundary & Tract Data Service (US Government (public domain)), NPS Visitor Use Statistics (2025) (CC0 (public domain)), NPS Acreage Report (Q1 2026) (US Government (public domain)).