Easiest: open driver's door, look at white decal on the tub next to the dashboard. You want the 3-character code labeled "paint."
Next easiest: open driver's door, unsnap carpet between the door and the driver's seat, look at the fender tag which is bolted to the floor of the tub. You're looking for a 3-character code that begins with the letter P.
Last chance: stand in front of the Jeep, pry up the plastic sway bar cover and look "inside" it. There is another fender tag hanging off the cross member. This fender tag only contains some of the info found on the other one, but I believe the paint code is one item you'll see there. Again, look for a 3-character code that starts with the letter P.
Hope that helps.
My fleet: 91 Miata, 98 Wrangler Sport
, 01 Suburban 8.1L, 14 Impreza, 03 Protege
Jeep mods: 4" longarm + 1" BL, 35" KM2s, 4.56s with dual ARBs... and lots of scratched armor