NAP acronym sands for Name Address Phone. You need to ensure that your are consistent in the way you list your Name, Address an Phone data on your site and on other citation and directory sites. Discrepancies in the way you are listed across various properties including your own site and on Google+Local, Google Maps, Yelp, and all the other directory and citation sites - can result in the Google Local engine to not give you ranking points for the local seo citations.
You can more strategically target a specific location by narrowing down your keyword research to specific towns, counties, or states in the Google Keyword Planner, or evaluate "interest by subregion" in Google Trends. Geo-specific research can help make your content more relevant to your target audience. For example, you might find out that in Texas, the preferred term for a large truck is “big rig,” while in New York, “tractor trailer” is the preferred terminology.
Of all the tools listed in this article, Moz Link explorer is an old one & quite popular. If you want to compare backlinks between two or more domains, Open Site Explorer is worth trying. This tool works best when you have a paid account of SEOMOZ though a free version of this tool is good enough to get you started checking the backlinks of your site and the sites of your competitors.