Signal's post office was established October 15, 1877 and discontinued may 14, 1932. Three years after the discovery of the McCracken mine in 1884, Signal came to be based from its own mine, and the mills for itself and McCracken. The major problem for Signal was getting freight to the isolated location. Shop owners had to order 6 months in advance. Mining was up and down for years and finally petered out in 1932. There is sometimes a caretaker today at Signal.

This town jumped from nothing during the silver hunt in 1877 and in the next 3 years town reach 800 citizens. 10 years after silver was gone but post office was open until 1932. To day is almost no memory left of once busy town. Submitted by: Bobby Krause Zlatevski