How many miles is it from Denton TX to mars?

Answer 1

It is about the same distance from Denton to Mars as it is from Earth to Mars, given that Denton, Texas, remains on earth at the present time.

The earth/mars distance varies as these bodies orbit the sun. Sometimes they are both on the same side, and the distance between is minimized. Sometimes they are on opposite sides of the sun, and the distance is maximized. The average distance is roughly 3 astronomical units.