Most Ford paint codes are on the parts ID sticker on the inside of your door near the bottom left. You should be able to see it above or below "ext pnt" or "ext." The codes are mostly two characters like UG or DX.
You can also find your car's color code by providing the last 8 digits of your VIN to the parts department of your local Ford dealership and they will be able to tell you what the color is.