| ALASKA | OLM | OLYMPIA |
| ARIZONA | OLS | NOGALES INTL |
| ILLINOIS | OLY | OLNEY-NOBLE |
| IOWA | OLZ | OELWEIN MUNI |
| MAINE | OLD | DEWITT FLD, OLD TOWN MUNI |
| MISSISSIPPI | OLV | OLIVE BRANCH |
| MONTANA | OLF | WOLF POINT L M CLAYTON |
| NEBRASKA | OLU | COLUMBUS MUNI |
| NEW YORK | OLE | CATTARAUGUS COUNTY-OLEAN |
| WASHINGTON | OLM_1 | OLYMPIA |
| WISCONSIN | OLG | SOLON SPRINGS MUNI |