Rock Falls City Building Department 603 W 10th St Rock Falls, IL 61071 Phone : (815) 622-1108 Rock Falls City Building Department Business Category Government Offices-City Village & Twp Legislative Bodies Rock Falls City Of--building Dept 603 W 10th St Sterling, IL 61081 Phone : (815) 622-1108 Business Category Government Offices-City Village & Twp Government Offices State & Local Government Offices & Public Schools