Cimarron County Chamber of Commerce PO Box 1027 Boise City, OK 73933 USA Phone: (580) 544-3344  Official Website So-where's the highest point in Oklahoma? Right in the northwest corner of Cimarron County! This "high point," also known as Black Mesa, extends into Colorado and New Mexico since it's about 55 miles long and up to several miles in width, depending on where you're standing. Black Mesa is great for hiking, bird watching, native plants, and of course the best night skies in America!

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