Expanding from Local SEO to State Wide

Hi All,

We are currently running local SEO and SEM campaigns in areas that we operate around the US. As an example, we are focusing on Miami in florida, but now want to expand our SEO and SEM efforts to Hollywood, Key West, Ft Lauderdale, etc and wondering what the best approach is. Currently we have a miami landing page setup, and it doesnt seem reasonable to have pages setup for every city in south floriday. Would it be best to have south florida as a landing page and mention locations we serve? What if we also want to start targetting Jacksonville, Tampa, Orlando? Should we then just consider taretting Florida as a whole?

Any advice is welcomed, we are growing but i am unsure of best way to approach this from an SEO/SEM perspective.