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Thanks for the information.

@educationedge012 Thanks, I should have made it clear that I'm not asking about how to optimize a site for a local business or even a business with multiple locations. I need to optimize a directory that lists businesses in different cities, so something like Yelp where if someone in Chicago searches "plumber" they get the aggregate landing page for plumbers in Chicago and people in other cities searching for "plumber" get the landing page for their city.

I'm trying to understand how to optimize landing pages to appear in local search. For example, if someone in Chicago searches for "plumber", Yelp has a page "Top 10 Plumbers in Chicago." They are generating these pages for numerous business types and cities. I can't see anything on the page or metadata that indicates a geographic location or business type. What optimizations are they doing to get Google to know that it's a page for a specific city and type of business?