County Attorney, 508 S. 10th Ave., Sterling, CO 80751 (970) 522-7190 Planning and Zoning Office, 315 Main Street, Sterling, CO 80751 (970) 522-7879. Emergency Manager, 315 Main Street, Sterling, CO 80751 (970) 520-0991. Logan County Fairgrounds, 1120 Pawnee Avenue, Sterling, CO 80751 (970) 522-0554 Logan County Fair, 315 Main Street, Sterling ...