As otehr s have said bug out if you can.......the further you are from major cities the better. I have always liked Mel Tappan's advice on retreating. If you have not already done so read his book "Tappan on Survival". It was written in the early 80's but it contains sound and practical info. Chapter 3 - Retreating answers your questions in a clear and succint manner. Spend the $20 and buy it.
^^^^^^^^^ What he said ^^^^^^^^^ Where ever or what ever, have a plan.