One often-overlooked factor can improve results when it comes to local searches.
I'm talking about consistency.
You have to understand that just because you post NAP data worldwide does not mean you will get the results you're looking for.
You have to be consistent in the form you're posting.
All information must be presented the same way.
As much as possible, present the same information in the same order.
It also helps tremendously if you go out of your way to get noticed by people who cover your area.
For example, local bloggers, directory builders, and chambers of commerce have lists of local businesses.
This is how you maximize the localization of your business, but all of this will be a waste of time if you're not consistent with the data that you have them put on their pages.