The Marshalltown Branch Office is managed by the Ames Area Office. If you have any questions or concerns, please contact the Area Office Supervisor, Melissa Keen. Address 101 Iowa Ave. West Suite 200 Marshalltown, IA 50158 United States Phone Number (641) 352-7942 Fax Number (641) 754-1404 Counties Served Jasper Marshall Poweshiek Tama