location (API, module)
http://drupal.org/project/location
location.module supports proximity searches for content. Content (i.e., 'nodes') can be tagged with a physical snail mail location (whether full or partial). What number of location fields (e.g., 'street', 'city', 'postal code', 'country', 'province') are collected for each node type (and whether they are required or optional) is configurable in the default workflow for each node type.
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