Texas 3rd BC2nd BC1st BC1st2nd3rd4th5th6th7th8th Denmark portal Subcategories This category has the following 4 subcategories, out of 4 total. 3rd millennium in Greenland (3 C)/ 3rd-millennium disestablishments in Denmark (2 C) 3rd-millennium establishments in Denmark (3 C)0–9 21st century in Denmark (17 C, 4 P)