Are you listed on Google Local?
"Google local is a service from Google that let's you search businesses pertaining to a particular locality and find all the contact information about it including the exact location. It's more or less like the traditional yellow pages, gone completely online." [from webdesign.org]
Local search sites can increase your SEO (search engine results). [read about that here]
"Google is turning its sights squarely on the local ad market, with plans to promote its local business listings in storefronts around the U.S." Plus you get local search data from Google if you put a listing up.