Local numbers are available in any area code for individuals and businesses. By establishing your business with a local phone number (as opposed to your personal area code), you also establish yourself as a local business. This helps prospective clients find you when searching online and in local directories.
You can add direct dial numbers for departments and remote offices if you want and set a dedicated fax number. Even if your business is mostly virtual or has a strong remote presence that sends its management out of the area you service, local numbers are available to put your establishment close to the people you hope will become your clients.
This closeness will be invaluable to your relationship with the surrounding community and your visibility to your prospective callers.