| Road/Street | Dist/Ward | Map# | Route# |
|---|---|---|---|
| OAK COURT | UNION | 14F | |
| OAK COURT | MORGAN | 4E | |
| OAK ST | 5TH WARD | 25, 26 | |
| OAK ST | BATTELLE | 13B | |
| OAK ST | GRANT | 20A | |
| OAK ST | UNION | 14B, 20B | |
| OAK ST | BLACKSVILLE | 1 | |
| OAKLAND ST | 7TH WARD | 11 | |
| OAKS DR | UNION | 14F | |
| OAKVIEW DR | MORGAN | 3B | |
| OAKWOOD ST | 7TH WARD | 2 | |
| OGDEN AVE | WESTOVER | 8,9 | |
| OGDEN ST | 6TH WARD | 44 | |
| OGLEBAY ST | 5TH WARD | ||
| OHIO AVE | WESTOVER | 3,4 | |
| OHIO AVE | 1ST WARD | 40, 48 | |
| OHIO ST | UNION | 12A-1 | |
| OLD CHEAT RD | UNION | ||
| OLD DUG HILL RD | MORGAN | ||
| OLD DUNKARD CR RD (BLACKSVILLE-CLOVIS BDG) | CLAY | 2,7 | 7/12 |
| OLD HOUSE LN | MORGAN | 4G-1-2 | |
| OLD KINGWOOD PIKE | MORGAN | 10,17,19,20,23,24,25 | 81 |
| OLD KINGWOOD PIKE | CLINTON | 4,5,14,15,16 | 81 |
| OLD LOCK #11 ROAD | GRANT | 13,14 | 45/9 |
| OLD LOCK 12 RD | GRANT | ||
| OLD LOCK 13 RD | GRANT | 21,23 | 40/4 |
| OLD LOCK 13 RD | GRANT | 15,21 | 40/2 |
| OLD MILL RD (BLACKSVILLE) | CLAY | 1 | 7/11 |
| OLD TAYLORTOWN RD | CASS | ||
| OLIVER ST | 2ND WARD | 41 | |
| OLLIE WILSON RD | CLAY | 19,26 | 25/10 |
| OPEKISKA RD | CLINTON | 9,10,11,20 | 36 |
| ORCHARD ALLEY | WESTOVER | 6 | |
| ORCHARD ST | GRANT | 5B | |
| ORD GALLAGHER RIDGE RD | BATTELLE | 24 | 15/5 |
| ORLANDO ST | 5TH WARD | 25 | |
| OSAGE LAWLESS RD | GRANT | 5,6 | 46 |
| OUTLOOK ST | 5TH WARD | 20 | |
| OUTLOOK ST | GRANT | 12B | |
| OVERDALE ST | 2ND WARD | 29, 36 | |
| OVERHILL ST | 4TH WARD | 14, 20 | |
| OVERLOOK DR | UNION | 20B | |
| OWL CREEK RD | CLINTON | 18,19 | 76/2 |
| OWL CREEK TO RIDGEDALE | CLINTON | 13,18,19 | 119/7 |
| OXFORD PL | 7TH WARD | 7 |