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One halfway point between Lawton, OK and Chicago, IL is Lincoln, MO.
Billings ok
Atoka OK
West Plains, Missouri is halfway between Tulsa and Clarksville
Jackson, TN.
The I-35 and Highway 60 junction west of Ponca City, OK will be approximately halfway.
Norman, OK
Phillipsburg, MO
Elk City, OK
Shawnee, OK
Grimes, Oklahoma is halfway between Alamogordo and Buffalo
The halfway point between Tulsa, OK and Fort Campbell, KY falls in or around Mountain View, MO.