Almaden Valley (often just called The Den) is an affluent upper-middle-class neighborhood of about 37,000 in the southeastern portion of San Jose, California, USA, roughly equivalent to the 95120 ZIP Code. The neighborhood is south east of the town of Los Gatos, west of the Santa Teresa neighborhood of San Jose and south of Coleman Rd. at the southern end of the Blossom Hill neighborhood of San Jose. It is named after the New Almaden Quicksilver Mines, which were named after the mercury mine in (old) Almadén, Spain, and produced mercury that was used to process ore during the Gold Rush. The informal borders are generally Coleman Rd. at the northern end, McKean Rd. at the southern end, where the valley becomes mostly rural, and the town of Los Gatos to the west.