Archuleta County was ranked as the 3rd fastest growing county in Colorado from 2000 to 2005, with a population growth of 21% during that time. Its current population is 11,716, and the county is expected to grow to over 14,000 by the year 2010, with an averaged annual growth rate of 3.2% per year. The bulk of the population growth is due to net migration, and the median age is decreasing every year, with a current median age of 39.8 years.