The LA Times has mapped the most crowded zip codes in the US, meaning those where households have more people than rooms in the house or apartment where they live. San Francisco has three zip codes that are among the most crowded in the country: 94133, 94108 and 94112. Those zip codes cover Chinatown and its surrounding areas from North Beach to Union Square as well as the Excelsior, Crocker Amazon and Balboa Park neighborhoods. [LA Times]
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