It is 933 miles (1501.52 kilometers) from Los Angeles, California to Dallas, Oregon (Not The Dalles, Oregon on the Columbia River).
So the half way point would be Willows, California right at 466.5 miles (750.75 kilometers) on Interstate Highway 5.
A few miles east of Deming, NM.
Washburn, TX is the halfway point.
The halfway point between Dallas, Texas and Warren, Ohio is in Centerville, Tennessee.
1/2 is the halfway point
A rough estimate would be Amarillo, Texas.
Waco!
Cuervo, NM
TENNESEE
The halfway point between Sydney, Australia and Los Angeles, California is London, Kiribati. The closest major city that is roughly halfway is Honolulu, Hawaii.
The halfway point is Clinton, Oklahoma.
Huntsville, Mississippi
Martin, Tennessee.