O'Brien County Iowa - Government Site
Population: 14,409
Area: 573 square miles
County Seat: Primghar
Area Code(s) in use: 712
Time Zone: CST
Adjacent counties:
Buena Vista Cherokee Clay Dickinson Lyon Osceola Plymouth Sioux
Airport
Baum-Harmon Memorial Hospital Heliport, Community Memorial Hospital Heliport, Lambert Fechter Municipal Airport, Paullina Municipal Airport, Primghar Airport, Sheldon Municipal Airport
Building
Archer Public Library, General N B Baker Library, Grant Townhall, Hartley Public Library, O'Brien County Courthouse, O'Brien County Sheriffs Office, Paullina Public Llibrary, Primghar Public Library, Sanborn Public Library, Sheldon City Hall, Sheldon Fire Department, Sheldon Police Headquarters, Sheldon Prairie Museum, Sheldon Public Library
Cemetery
Calvary Cemetery, Center Township Cemetery, Doyle Cemetery, East Lawn Cemetery, First Cemetery, Fred Fieldman Grave, Friends Cemetery, Grant Cemetery, Liberty Cemetery, Pleasant Hill Cemetery, Pleasant View Cemetery, Prairie View Cemetery, Randolph Cemetery, Roseland Cemetery, Saint Anthonys Cemetery, Saint Cecilla Cemetery, Saint John Cemetery, Saint Patricks Cemetery, Saint Paul Cemetery, Steuck Cemetery, Waterman Cemetery, West Prairie View Cemetery
Church
American Reformed Church, Archer Reformed Church, Baker Church, Bethel Lutheran Church, Bethel Reformed Church, Calvary Baptist Church, Christian Reformed Church, Church of Christ, Church of Christ, Cornerstone United Reformed Church, Covey Church, First Christian Reformed Church, First Reformed Church, First Reformed Church, Grace Lutheran Church, Grant Bible Church, Immanuel Christian Reformed Church, Parkview Assembly Church, Sacred Heart Catholic Church, Saint Andrews United Methodist Church, Saint Anthony s Catholic Church, Saint Cecilia Catholic Church, Saint Johns Lutheran Church, Saint Johns Lutheran Church, Saint Joseph Catholic Church, Saint Patricks Church, Saint Paul Lutheran Church, Saint Pauls Lutheran Church, Sanborn Presbyterian Church, Sheldon Branch Church of Latter Day Saints, Siloam Lutheran Church, Sutherland Methodist Church, Trinity United Church of Christ, United Church of Primghar, United Methodist Church, United Methodist Church, United Methodist Church, United Methodist Church, Zion Lutheran Church, Zion United Church of Christ
Civil
O'Brien County, Township of Baker, Township of Caledonia, Township of Carroll, Township of Center, Township of Dale, Township of Floyd, Township of Franklin, Township of Grant, Township of Hartley, Township of Highland, Township of Liberty, Township of Lincoln, Township of Omega, Township of Summit, Township of Union, Township of Waterman
Dam
Dog Creek Dam
Hospital
Baum-Harmon Memorial Hospital, Christian Retirement Home, Community Memorial Health Center, Eyecare Center, Hartley Chiropractic Center, Hartley Clinic, Mercy Family Care Center - Hartley, Miedema Chiropractic Clinic, Mill Creek Family Practice, Millies Rest Home, Northwest Iowa Health Center, Northwest Iowa Health Center, Northwest Iowa Urologists Center, Oak Park Care Center, Ohme Medical Clinic, Paullina Chiropractic Center, Paullina Family Medical Clinic, Pellerin Chiropractic Clinic, Prairie View Retirement Home, Primghar Care Center, Primghar Chiropractic Center, Ruby Chiropractic Clinic, Ruby Chiropractic Clinic, Sanborn Chiropractic Clinic, Sanborn Medical Clinic, Sheldon Chiropractic Clinic, Sheldon Family Practice Association, Sutherland Family Medicine Center, Sweeney Chiropractic Clinic, Wide View Rest Home, Wurth Chiropractic Clinic
Locale
Archer (historical), Archer Cooperative Grain Elevator, Bruegmann Rea Access, Calumet (historical), Camp Yo-Lo-To-Go, Elcho, Farmers Cooperative Elevator, Gaza (historical), Hartley, Hartog Elevator Incorporated Elevator, Hill Little Sioux Overlook, Legion Country Club, Max (historical), Meadowbrook Golf and Country Club, Mill Creek Grain Incorporated Elevator, Nicholson and Edwards Grain Company Elevator, Northwest Iowa Research Farm, O'Brien, O'Brien County Fairground, O'Brien County Home, Old Dutch Fred Access, Pleissis Elevator Incorporated Elevator, Plessis (historical), Primghar (historical), Primghar City Park Campground, Primghar Golf and Country Club, Sanborn, Sanborn Golf and Country Club, Sheldon, Sheldon Country Club, Siouxland Farmers Co-op Elevator, Siouxland Farmers Co-op Elevator, Sutherland (historical), Sutherland Farmers Co-op Elevator, Terra International Incorporated Elevator, Tjossem Park Campground, Top Line Feed and Supply Incorporated Elevator
Park
Covey Church Park, Dog Creek County Park, Douma Park, First Settlement in O'Brien County Historical Marker, Flinders Area, Hills Park, Honoring World War I Veterans Historical Marker, Indian Village State Park, Litka Park, McCormack Area, Memorial to Four Pioneers Historical Marker, Mill Creek Area, Mill Creek State Park, Negus Recreation Area, Primghar City Park, Rahbusch Tract, Railroad Area, Sheldon City Park, Sunrise Park, Thorman Park, Tjossem Park, Waterman Prairie Wildlife Management Area, Waterman Wildlife Area, Weale Area
Populated Place
Archer, Calumet, Evander, Gaza, Germantown, Hartley, Mapleside, Max, Moneta, Paullina, Philby, Plessis, Primghar, Ritter, Sanborn, Sheldon, Sutherland, Waterman
Post Office
Archer Post Office, Calumet Post Office, Crona Post Office (historical), Elcho Post Office (historical), Erie Post Office (historical), Gaza Post Office (historical), Germantown Post Office (historical), Hartley Post Office, Max Post Office (historical), Moneta Post Office (historical), O'Brien Post Office (historical), Paullina Post Office, Philby Post Office (historical), Plessis Posot Office (historical), Primghar Post Office, Romano Post Office (historical), Sanborn Post Office, Shabbona Post Office (historical), Sheldon Post Office, Sutherland Post Office, Waterman Post Office (historical)
School
East Elementary School, Hartley High School, Hartley-Melvin-Sanborn Elementary School, Hartley-Melvin-Sanborn High School, Hartley-Melvin-Sanborn Middle School, Saint Patricks School, Sanborn Christian School, Sheldon Christian School, Sheldon High School, Sheldon Middle School, South O'Brien Community School, South O'Brien Junior High School, South O'Brien Middle School, Zion Lutheran School
Stream
Barry Creek, Cole Creek, Dog Creek, Dry Run, Dry Run, Engels Creek, Epping Creek, Ginger Creek, Henry Creek, Johnson Creek, Jordan Creek, Lake Creek, Lamkin Creek, Lange Creek, Little Waterman Creek, McCreath Creek, Mud Creek, Nelson Creek, North Fork Floyd River, Plessis Creek, Roetzel Creek, South Branch Little Floyd River, Stofferan Creek, Sweeney Creek, Waterman Creek, West Branch Mill Creek, Whiskey Creek, Whiskey Creek, Willow Creek, Wolf Creek
Tower
KIWA-FM (Sheldon)
| Race | Population |
| White |  14,162 |
| Asian | 83 |
| Mixed | 74 |
| Black | 53 |
| American Indian | 36 |
| Hawaiian & Pacific Islander | 1 |
| Additional population tables : | |
| State population table | |
| Iowa population by county | |