The town of Marana is about halfway.
The halfway point between Decatur, Illinois, and Phoenix, Arizona falls in Clarendon, Texas.
Las Vegas
On a map, it looks to be close to Eagle Mountain.
Woodward, Oklahoma, on US 412 is the halfway point.
Elk City, OK
Oklahoma City is a halfway point between Ironton, Ohio and Phoenix, AZ.
Springfield, North Carolina is the halfway point.
The halfway point is near Rolla, MO, via I-90 and I-70W.
Banner, Oklahoma.
Hereford, Texas
Guymon, Oklahoma is half way between Phoenix and Colchester, Illinois
Panhandle, TX