Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Wiese Slough State Game Management Area | Park | 192 | Muscatine | 41 33 16 N | 091 08 03 W |
| Wildasin Cemetery | Cemetery | 213 | Muscatine | 41 34 00 N | 091 01 41 W |
| Wildcat Den State Park | Park | 191 | Muscatine | 41 28 04 N | 090 52 53 W |
| Wildsan Cemetery | Cemetery | 213 | Muscatine | 41 34 01 N | 091 01 43 W |
| Wilton | Locale | 207 | Muscatine | 41 35 15 N | 091 01 18 W |
| Wilton | Populated Place | 207 | Muscatine | 41 35 20 N | 091 01 01 W |
| Wilton Care Center | Hospital | 218 | Muscatine | 41 35 43 N | 091 00 43 W |
| Wilton City Hall | Building | 207 | Muscatine | 41 35 19 N | 091 00 59 W |
| Wilton Community School | School | 216 | Muscatine | 41 35 41 N | 091 00 39 W |
| Wilton Depot | Building | 207 | Muscatine | 41 35 15 N | 091 01 05 W |
| Wilton Elementary School | School | 213 | Muscatine | 41 35 28 N | 091 00 53 W |
| Wilton Fire Station | Building | 209 | Muscatine | 41 35 22 N | 091 00 48 W |
| Wilton Police Department | Building | 207 | Muscatine | 41 35 19 N | 091 00 59 W |
| Wilton Post Office | Post Office | 208 | Muscatine | 41 35 19 N | 091 00 57 W |
| Wilton Public Library | Building | 207 | Muscatine | 41 35 19 N | 091 00 59 W |
| Wyoming Slough | Stream | | Muscatine | 41 26 24 N | 090 59 39 W |
| Ziegler Memorial Lutheran Church | Church | 227 | Muscatine | 41 27 59 N | 090 53 38 W |
| Zion Lutheran Church | Church | 181 | Muscatine | 41 25 30 N | 091 02 52 W |
| Zion Lutheran Church | Church | 216 | Muscatine | 41 35 42 N | 091 00 60 W |
| Zion Lutheran Church | Church | 205 | Muscatine | 41 34 25 N | 091 10 05 W |
| Zion Lutheran School | School | 217 | Muscatine | 41 35 43 N | 091 00 57 W |
| American Reformed Church | Church | 465 | O'Brien | 43 05 15 N | 095 37 32 W |
| Archer | Populated Place | 448 | O'Brien | 43 06 55 N | 095 44 45 W |
| Archer (historical) | Locale | 448 | O'Brien | 43 06 55 N | 095 44 45 W |
| Archer Cooperative Grain Elevator | Locale | 448 | O'Brien | 43 06 55 N | 095 44 45 W |
| Archer Post Office | Post Office | 448 | O'Brien | 43 06 55 N | 095 44 45 W |
| Archer Public Library | Building | 448 | O'Brien | 43 06 55 N | 095 44 45 W |
| Archer Reformed Church | Church | 448 | O'Brien | 43 06 55 N | 095 44 45 W |
| Baker Church | Church | 430 | O'Brien | 43 04 10 N | 095 47 58 W |
| Barry Creek | Stream | | O'Brien | 43 00 52 N | 095 25 45 W |
| Baum-Harmon Memorial Hospital | Hospital | 463 | O'Brien | 43 05 20 N | 095 37 24 W |
| Baum-Harmon Memorial Hospital Heliport | Airport | 463 | O'Brien | 43 05 18 N | 095 37 26 W |
| Bethel Lutheran Church | Church | 445 | O'Brien | 42 58 10 N | 095 29 57 W |
| Bethel Reformed Church | Church | 437 | O'Brien | 43 10 55 N | 095 50 58 W |
| Bruegmann Rea Access | Locale | 419 | O'Brien | 43 11 24 N | 095 23 19 W |
| Calumet | Populated Place | 438 | O'Brien | 42 56 47 N | 095 33 00 W |
| Calumet (historical) | Locale | 437 | O'Brien | 42 56 49 N | 095 32 57 W |
| Calumet Post Office | Post Office | 438 | O'Brien | 42 56 47 N | 095 33 00 W |
| Calvary Baptist Church | Church | 436 | O'Brien | 43 10 41 N | 095 50 50 W |
| Calvary Cemetery | Cemetery | 436 | O'Brien | 42 58 07 N | 095 29 10 W |
| Camp Yo-Lo-To-Go | Locale | 387 | O'Brien | 42 58 58 N | 095 25 51 W |
| Center Township Cemetery | Cemetery | 461 | O'Brien | 43 06 54 N | 095 32 07 W |
| Christian Reformed Church | Church | 467 | O'Brien | 43 10 56 N | 095 39 48 W |
| Christian Retirement Home | Hospital | 439 | O'Brien | 43 10 49 N | 095 50 29 W |
| Church of Christ | Church | 442 | O'Brien | 42 58 24 N | 095 30 04 W |
| Church of Christ | Church | 462 | O'Brien | 43 05 10 N | 095 37 51 W |
| Cole Creek | Stream | | O'Brien | 42 54 41 N | 095 43 41 W |
| Community Memorial Health Center | Hospital | 451 | O'Brien | 43 11 00 N | 095 29 17 W |
| Community Memorial Hospital Heliport | Airport | 452 | O'Brien | 43 11 01 N | 095 29 23 W |
| Cornerstone United Reformed Church | Church | 473 | O'Brien | 43 11 06 N | 095 38 44 W |
| Covey Church | Church | 451 | O'Brien | 43 04 09 N | 095 29 15 W |
| Covey Church Park | Park | 438 | O'Brien | 43 05 05 N | 095 28 16 W |
| Crona Post Office (historical) | Post Office | 456 | O'Brien | 43 06 30 N | 095 32 01 W |
| Dog Creek | Stream | | O'Brien | 42 55 27 N | 095 26 09 W |
| Dog Creek County Park | Park | 418 | O'Brien | 42 56 12 N | 095 28 22 W |
| Dog Creek Dam | Dam | 401 | O'Brien | 42 56 12 N | 095 28 02 W |
| Douma Park | Park | 439 | O'Brien | 43 09 45 N | 095 42 21 W |
| Doyle Cemetery | Cemetery | 462 | O'Brien | 43 03 42 N | 095 31 29 W |
| Dry Run | Stream | | O'Brien | 42 58 22 N | 095 40 07 W |
| Dry Run | Stream | | O'Brien | 43 00 47 N | 095 42 17 W |
| East Elementary School | School | 437 | O'Brien | 43 10 60 N | 095 50 24 W |
| East Lawn Cemetery | Cemetery | 442 | O'Brien | 43 10 47 N | 095 50 04 W |
| Elcho | Locale | 456 | O'Brien | 43 05 07 N | 095 30 12 W |
| Elcho Post Office (historical) | Post Office | 456 | O'Brien | 43 05 07 N | 095 30 12 W |
| Engels Creek | Stream | | O'Brien | 43 12 20 N | 095 49 21 W |
| Epping Creek | Stream | | O'Brien | 43 10 34 N | 095 30 43 W |
| Erie Post Office (historical) | Post Office | 445 | O'Brien | 42 55 25 N | 095 33 29 W |
| Evander | Populated Place | 433 | O'Brien | 43 10 43 N | 095 45 45 W |
| Eyecare Center | Hospital | 430 | O'Brien | 42 58 46 N | 095 41 12 W |
| Farmers Cooperative Elevator | Locale | 444 | O'Brien | 43 10 41 N | 095 28 19 W |
| First Cemetery | Cemetery | 400 | O'Brien | 42 55 60 N | 095 25 01 W |
| First Christian Reformed Church | Church | 436 | O'Brien | 43 10 45 N | 095 50 46 W |
| First Reformed Church | Church | 439 | O'Brien | 43 10 51 N | 095 50 32 W |
| First Reformed Church | Church | 474 | O'Brien | 43 11 07 N | 095 39 37 W |
| First Settlement in O'Brien County Historical Marker | Park | 404 | O'Brien | 42 55 50 N | 095 25 01 W |
| Flinders Area | Park | 454 | O'Brien | 42 58 50 N | 095 31 26 W |
| Fred Fieldman Grave | Cemetery | 380 | O'Brien | 42 56 40 N | 095 23 51 W |
| Friends Cemetery | Cemetery | 445 | O'Brien | 43 00 10 N | 095 37 21 W |
| Gaza | Populated Place | 457 | O'Brien | 43 01 13 N | 095 34 48 W |
| Gaza (historical) | Locale | 459 | O'Brien | 43 01 15 N | 095 34 43 W |
| Gaza Post Office (historical) | Post Office | 457 | O'Brien | 43 01 13 N | 095 34 48 W |
| General N B Baker Library | Building | 438 | O'Brien | 42 58 19 N | 095 29 59 W |
| Germantown | Populated Place | 434 | O'Brien | 42 57 12 N | 095 46 51 W |
| Germantown Post Office (historical) | Post Office | 434 | O'Brien | 42 57 12 N | 095 46 51 W |
| Ginger Creek | Stream | | O'Brien | 42 59 44 N | 095 36 58 W |
| Grace Lutheran Church | Church | 465 | O'Brien | 43 05 23 N | 095 37 26 W |
| Grant Bible Church | Church | 434 | O'Brien | 43 02 21 N | 095 24 30 W |
| Grant Cemetery | Cemetery | 452 | O'Brien | 43 04 05 N | 095 29 14 W |
| Grant Townhall | Building | 433 | O'Brien | 43 02 23 N | 095 26 51 W |
| Hartley | Locale | 445 | O'Brien | 43 10 41 N | 095 28 34 W |
| Hartley | Populated Place | 446 | O'Brien | 43 10 48 N | 095 28 37 W |
| Hartley Chiropractic Center | Hospital | 445 | O'Brien | 43 10 58 N | 095 28 31 W |
| Hartley Clinic | Hospital | 444 | O'Brien | 43 11 07 N | 095 28 16 W |
| Hartley High School | School | 451 | O'Brien | 43 11 25 N | 095 29 07 W |
| Hartley Post Office | Post Office | 446 | O'Brien | 43 10 49 N | 095 28 38 W |
| Hartley Public Library | Building | 446 | O'Brien | 43 10 47 N | 095 28 33 W |
| Hartley-Melvin-Sanborn Elementary School | School | 446 | O'Brien | 43 10 50 N | 095 28 24 W |
| Hartley-Melvin-Sanborn High School | School | 449 | O'Brien | 43 11 10 N | 095 29 06 W |
| Hartley-Melvin-Sanborn Middle School | School | 473 | O'Brien | 43 11 06 N | 095 39 22 W |
| Hartog Elevator Incorporated Elevator | Locale | 473 | O'Brien | 43 10 52 N | 095 39 26 W |
| Henry Creek | Stream | | O'Brien | 42 56 20 N | 095 23 36 W |
| Hill Little Sioux Overlook | Locale | 400 | O'Brien | 42 56 37 N | 095 23 56 W |
| Hills Park | Park | 426 | O'Brien | 43 11 32 N | 095 51 12 W |
| Honoring World War I Veterans Historical Marker | Park | 438 | O'Brien | 43 11 05 N | 095 51 01 W |
| Immanuel Christian Reformed Church | Church | 436 | O'Brien | 43 10 55 N | 095 50 09 W |
| Indian Village State Park | Park | 385 | O'Brien | 42 58 44 N | 095 25 37 W |
| Johnson Creek | Stream | | O'Brien | 43 02 12 N | 095 43 10 W |
| Jordan Creek | Stream | | O'Brien | 42 59 06 N | 095 25 58 W |
| KIWA-FM (Sheldon) | Tower | 418 | O'Brien | 43 10 56 N | 095 52 06 W |
| Lake Creek | Stream | | O'Brien | 43 04 30 N | 095 36 45 W |