List of Schools In Iowa
| School Name | City | Grades |
|---|---|---|
| OAK PARK SCHOOL 3928 6TH AVE | DES MOINES | PK-5 |
| OAK RIDGE SCHOOL 4901 ALBURNETT RD | MARION | 6-8 |
| OAK STREET MIDDLE SCHOOL 903 OAK ST | BURLINGTON | 6-8 |
| OCHEYEDAN ELEMENTARY SCHOOL 896 MAIN ST | OCHEYEDAN | 4 |
| ODEBOLT-ARTHUR ELEMENTARY SCHOOL 600 SOUTH MAPLE | ODEBOLT | PK-5 |
| ODEBOLT-ARTHUR HIGH SCHOOL 600 MAPLE | ODEBOLT | 9-12 |
| ODEBOLT-ARTHUR MIDDLE SCHOOL 600 SOUTH MAPLE | ODEBOLT | 6-8 |
| OELWEIN HIGH SCHOOL 315 8TH AVE SE | OELWEIN | 9-12 |
| OELWEIN MIDDLE SCHOOL 300 12TH AVE SE | OELWEIN | 6-8 |
| OGDEN HIGH SCHOOL 732 WEST DIVISION | OGDEN | 9-12 |
| OGDEN MIDDLE SCHOOL 313 WEST SYCAMORE | OGDEN | 5-8 |
| OKOBOJI ELEMENTARY SCHOOL 705 NORTH AVE | MILFORD | PK-4 |
| OKOBOJI HIGH SCHOOL 901 H. AVE | MILFORD | 9-12 |
| OKOBOJI MIDDLE SCHOOL 10 BROADWAY | ARNOLDS PARK | 5-8 |
| OLIN ELEMENTARY SCHOOL 212 TRILBY ST | OLIN | PK-5 |
| OLIN JUNIOR-HIGH SCHOOL 212 TRILBY ST | OLIN | 6-12 |
| OLMSTED ELEMENTARY SCHOOL 7110 PRAIRIE AVE | URBANDALE | PK-5 |
| ORANGE CITY ELEMENTARY SCHOOL 312 1ST ST NW | ORANGE CITY | PK-5 |
| ORANGE ELEMENTARY SCHOOL 6028 KIMBALL AVE | WATERLOO | KG-5 |
| ORCHARD HILL ELEMENTARY SCHOOL 3909 ROWND ST | CEDAR FALLS | PK-6 |
| ORCHARD PLACE SCHOOL 5412 SW 9TH ST | DES MOINES | KG-12 |
| ORIENT ELEMENTARY SCHOOL 201 SOUTH SCHOOL ST | ORIENT | PK-6 |
| ORIENT-MACKSBURG HIGH SCHOOL 201 SOUTH SCHOOL ST | ORIENT | 7-12 |
| OSAGE HIGH SCHOOL 820 SAWYER | OSAGE | 9-12 |
| OSAGE MIDDLE SCHOOL 820 SAWYER | OSAGE | 6-8 |
| OSKALOOSA ELEMENTARY SCHOOL 1801 ORCHARD AVE | OSKALOOSA | KG-5 |
| OSKALOOSA HIGH SCHOOL 1816 NORTH 3RD EXTENSION | OSKALOOSA | 9-12 |
| OSKALOOSA MIDDLE SCHOOL 1704 NORTH 3RD ST | OSKALOOSA | 6-8 |
| OSKALOOSA PRESCHOOL 508 SOUTH 7TH | OSKALOOSA | PK-KG |
| OTTO B LAING MIDDLE SCHOOL 213 SOUTH HARLAN | ALGONA | 6-8 |
| OTTUMWA HIGH SCHOOL 501 EAST 2ND | OTTUMWA | 9-12 |
| OVIATT ELEMENTARY SCHOOL 713 SCHOOL AVE | NORWALK | PK-3 |