The Sheldon Branch Office is managed by the Sioux City Area Office. If you have any questions or concerns, please contact the Area Office Supervisor, Brittney Gutzmann. If you need to send anything to the Sheldon office, please send it to P.O. Box 321 instead of the address listed below. Address 517 Park St. Suite A Sheldon, IA 51201 United States Phone Number (712) 324-4864 Fax Number (712) 324-3409 Counties Served Lyon O' Brien Osceola Sioux