Washington, DC – Sublette County is among the top 50 fastest growing counties in the country. The booming natural gas industry drove a 4.7% increase in Sublette County's population last year. The U-S Census Bureau estimates Sublette County added almost 300 residents for a total population of 6,654. Neighboring Sweetwater County increased by over 600 residents last year. Counties that saw their populations fall between 2003 and 2004 include Hot Springs, Carbon, Weston, and Albany counties.