Hi, lanna_wsu, welcome to the forum. Most mystery shopping companies don't concentrate on a small area of the country, although there are different opportunities in different areas. The best way to find as many opportunities as possible in your area is to sign up with as many companies as possible, preferably 100+. See the list at the blue link at the bottom of the page, Official List of Mystery Shopping Companies. Only mystery shoppers currently performing the jobs in your area could tell you which companies have the most shops in your area. Those currently working in that area may be hesitant to give away job opportunities to their competition.