Locations To contact someone about a potential project that requires the Western Difference, please click on the links or the map below to find your regional contact or the branch location nearest you. AR – Little Rock CA – Los Angeles CA – San Diego CO – Denver DC – Washington D.C. FL – Fort Lauderdale FL – Orlando GA – Atlanta IA – Des Moines IA – Iowa City IL – Chicago IL – Peoria IL – Springfield IN – Indianapolis MN – Duluth MN – Minneapolis MO – Kansas City MO – St. Louis NC – Charlotte NE – Omaha NY – New York OH – Cleveland OK – Tulsa TX – Houston TX – Dallas TX – San Antonio WA – Seattle (Listed alphabetically by state) Click on your state for contact information