It appears Greenland will join the USA either voluntarily or unfortunately by force (which would mean one nato country attacks another, and could end the nato alliance) as a territory or statehood. This will happen within 1 year from today and their zip code will start with 19000 USPS. 68% chance of accuracy.
Two letter USPS ID "GN" All addresses will undergo E911 redistricting services. Counties are going to be incorporated, Sheriff's Dept for each county. Greenland State troopers (if statehood).