The Collaborative International Dictionary of English v.0.48:
Evergreen State \Evergreen State\ Washington; -- a nickname alluding to the abundance of evergreen trees. [Webster 1913 Suppl.] EverichWordNet (r) 3.0 (2006):
Evergreen State n 1: a state in northwestern United States on the Pacific [syn: Washington, Evergreen State, WA]