Look in your owners manuel for the code. It's on a card about the size of a business card.
Or call your local Friendly Ford Dealer with the VIN
I finally found a website that gave me a working radio code: http://unlockradiocodes.com
Looking for a Used Mountaineer in your area?
CarGurus has 1,433 nationwide Mountaineer listings starting at $1,000.
Search Mercury Mountaineer Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Mercury Mountaineer Experts