| ----NAME---- | ----TOWNSHIP---- | CENSUS PAGE |
| O BRINT, Daniel | FORT COVINGTON | 185 |
| O BRYAN, Thomas | MALONE | 168 |
| O CONNEL, Michael | BOMBAY | 200 |
| O CONNEL, Patrick | CHATEAUGAY | 245 |
| O CONNELL, John | BOMBAY | 201 |
| O CONNELL, Patrick | BRANDON | 220 |
| O CONNELL, Richard | CONSTABLE | 235 |
| O CONNER, James | BOMBAY | 204 |
| O CONNER, John | BOMBAY | 204 |
| O FLAKERTY, Cornelius | BOMBAY | 199 |
| O KEEFE, James | FORT COVINGTON | 186 |
| O KEEFE, John | FORT COVINGTON | 186 |
| O KEIF, Mciahel | BOMBAY | 204 |
| O NEIL, David | BOMBAY | 201 |
| O NEIL, Morris | BOMBAY | 197 |
| O NEIL, Patrick | BOMBAY | 197 |
| O RIELY, Cornelius | MALONE | 163 |
| O RIELY, Cornelius | MALONE | 166 |
| O RIELY, Edward | MALONE | 168 |
| O RIELY, Patrick | MALONE | 163 |
| OAKS, Thomas | MOIRA | 225 |
| ODLE, David | CHATEAUGAY | 242 |
| OLANA, Belina | CHATEAUGAY | 247 |
| OLIVER, George | BOMBAY | 199 |
| ORCUTT, Harry | MALONE | 163 |
| ORDWAY, Hiram | WESTVILLE | 209 |
| ORDWAY, Jonathan | FORT COVINGTON | 184 |
| ORDWAY, Stilman | WESTVILLE | 205 |
| ORVIS, Benjamin | BRANDON | 220 |
| ORVIS, John A. | BRANDON | 220 |
| ORVIS, Malichi | BRANDON | 220 |
| OSBORN, Peter | WESTVILLE | 208 |
| OTIS, David | DUANE | 224 |
| OTIS, John | DUANE | 224 |
| OTIS, Stephen | DUANE | 224 |
| OWEN, Alexander | BOMBAY | 201 |
| OWEN, Amacy | CHATEAUGAY | 248 |
| OWENS, Elisha B. | MALONE | 169 |