what county is erie, co in?
<answer> Erie is in Boulder County and Weld County, Colorado. <context> Erie, Colorado. Overview: Located 25 miles north of Denver and just west of I-25, Erie offers a small town feel coupled with an easy commute to Denver International Airport, Boulder and Denver. The Town of Erie straddles Boulder County and Weld County and has a total area of 9.5 square miles.