Yes, and there's Canada. It's 10C outside, but I cook chicken at 250F, the news says we got 2.5 cm of snow, but my friends say "1 inch," if I ask directions I'm as likely to be told kilometers as miles, we use 8.5 by 11 inch paper, but my gas is sold by the litre...
..and, of course, we blame it on the Americans!
My car gets 40 rods to the hogshead, and that's the way I likes it!
Malaysia, the one just below Thailand, officially uses the metric system but the old ways never go away. Why should it when it's good business, especially in regards to weights and measures. You see, over here the traders rip off the people by using low tech balances to weigh stuff. And they use local units of measurement for trading. Of course, there are modern machines to do this but like I said, what for?
hunter152, correct me if I'm wrong, but Hawaii is also an American state, so it's only 3 countries.
As Wikipedia (fountain of all knowledge) says: "Three nations have not officially adopted the International System of Units as their primary or sole system of measurement: Liberia, Myanmar and the United States."