WY = Wyoming, CO = Colorado,CT = Connecticut and ME = Maine. All the UStates have two letter abbreviations. They usually consist of the first and last or the first and second letter in a state's name. I usually try to write out the name at least once in a post because folks in other countries may not have any idea what the abbreviations mean. (Especially when you get to the M's: MS, MI, MN, MO, ME, MA, etc.)