Mars is not located within the Milky Way galaxy. It's part of our solar system, which itself is located within the Milky Way galaxy.

To be more specific:

* Mars orbits the Sun, just like Earth and the other planets in our solar system.

* Our solar system is located within one of the spiral arms of the Milky Way, known as the Orion Arm.

So, Mars is in our solar system, which is located within the Milky Way galaxy.