Kirk, Colorado is halfway between Amarillo & Rapid City
Assuming that you are driving, the halfway point is right around Elk City, Oklahoma. The closest cities to the halfway point are Oklahoma City, Oklahoma and Amarillo, Texas.
The halfway point is Clarendon, TX. I would stay in Amarillo.
Oklahoma City is fairly close to halfway between Flint, Michigan and Tucson, Arizona.
Amarillo, TX
The halfway point between Edmond, OK, and Taos, NM, is approximately near the city of Amarillo, TX. This location is roughly equidistant from both starting points and offers convenient access to major highways. Depending on your specific route, the exact halfway point may vary slightly, but Amarillo serves as a good general reference.
I'll assume you mean the Waco in Texas and the Denver in Colorado. There are at least three others of each. The halfway point is Amarillo. There's only one of that.
The halfway point between Mobile, Alabama, and Riverside, California, is approximately in the vicinity of Amarillo, Texas. This location is roughly equidistant from both cities, making it a reasonable meeting point for travelers. Amarillo is known for its distinctive landmarks, such as the Cadillac Ranch and the Big Texan Steak Ranch.
Brighton, MI.
The halfway point between Colorado Springs, CO, and downtown Oklahoma City, OK, is approximately near the town of Amarillo, Texas. This location is roughly equidistant from both cities, making it a convenient stop for travelers. The distance from Colorado Springs to Oklahoma City is about 600 miles, so Amarillo serves as a good midpoint for rest and refueling.
Vernon, Tx is as close to halfway as far as a town that has restaurants and gas and stuff.
One big city that is halfway between California and Ohio is Amarillo, TX. Another is Oklahoma City, Oklahoma. Not as big but almost exactly halfway is Elk City, Oklahoma.