And some commentary from Gallup:
Residents of Western and Midwestern states are generally more positive about their states as places to live. With the exception of the New England states of New Hampshire and Vermont, all of the top 10 rated states are west of the Mississippi River. In addition to Montana and Alaska, Utah (70%), Wyoming (69%), and Colorado (65%) are among the 10 states that residents are most likely to say their state is among the best places to reside. Most of these states have relatively low populations, including Wyoming, Vermont, North Dakota, and Alaska -- the four states with the smallest populations in the nation. Texas, the second most populated state, is the major exception to this population relationship. Although it is difficult to discern what the causal relationship is between terrain and climate and positive attitudes, many of the top 10 states are mountainous with cold winters. In fact, the two states most highly rated by their residents -- Montana and Alaska -- are among not only the nation's coldest states but also both border Canada.