According to the U.S. Census Bureau, as of 2005, Vermont has an estimated population of 623,050, which is an increase of 1,817, or 0.3%, from the prior year and an increase of 14,223, or 2.3%, since the year 2000.

This includes a natural increase since the last census of 7,148 people (that is 33,606 births minus 26,458 deaths) and an increase due to net migration of 7,889 people into the state. Immigration from outside the United States resulted in a net increase of 4,359 people, and migration within the country produced a net increase of 3,530 people.