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Telegraph City in Calaveras County Originally called Grasshopper the town's name was changed to Telegraph City after the construction of a telegraph line from Stockton to Sonora was routed through the city. The town had a post office that operated from 1862 to 1894 but probably not much has happened there since. Today all that remains of Telegraph City are a few building foundations, a still working windmill, a single palm tree, and many miles of rock walls.