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From http://www.handgunlaw.us/states/oklahoma.pdf" onclick="window.open(this.href);return false;

Carry In State Parks/State & National Forests/WMA/Road Side Rest Areas
Carry Allowed in these Areas:
State Parks: YES §21-1277. But not in buildings.
State/National Forests: YES §21-1277. But not in buildings.
WMA’s: Uncertain See Title 29 OK Statutes Also See Title 800 OK Admin Rules
Road Side Rest Areas: YES §21-1277. But not in buildings.