| Surname | Township |
| Nance | Ward 2 |
| Nation | Jones |
| Nazbey | Mainshore |
| Neeley | Clarke |
| Neely | Ward 1, Ward 2 |
| Neesmith | Ward 3 |
| Nelson | Ward 3 |
| Nesmith | Ward 2 |
| Nettles | Lake, Ward 3 |
| Newberry | Cache, Poland, Salem, Shady Grove, Ward 2 |
| Newborn | Hurricane |
| Newcolm? | Spring Grove |
| Newell | Jones |
| Newsom | Poland |
| Newsom | Spring Grove |
| Newsome | Ward 2 |
| Newson | Clarke |
| Nicely | Union |
| Nichleson | Ward 2 |
| Nicholes | Clarke |
| Nichols | Ward 1 |
| Nickson | St. Francis |
| Nierstheiner | Crowley |
| Nixon | Ward 3 |
| Noel | Friendship |
| Norman | Crowley, Lake |
| Norsworthy | Crowley |
| Northern | Bryan |
| Norton | Mainshore, Poland, St. Francis, Union |
| Norvell | Hurricane, Jones |
| Norvill | Spring Grove |
| Norwelle | Ward 1 |
| Norwood | Cache, Ward 2 |
| Nugent | Cache |
| Nunely | St. Francis |
| Nutt | Friendship, Salem, Shady Grove, Union |
| Surname | Township |
| Oakley | Ward 3 |
| Oberliter | Lake |
| O'Connor | Shady Grove |
| Odain | Ward 2 |
| O'Dell | Jones |
| Oden | Salem, Shady Grove |
| Oglesby | Clarke |
| O'Hair | Lake |
| O'Holland | Ward 1 |
| Oldham | Bryan |
| Olds | Cache |
| Oliver | Clarke, Jones, Mainshore, St. Francis, Union |
| Oost | St. Francis |
| Orr | Jones, Union |
| Orrell | Hurricane |
| Ortcutter | Union |
| Orton | Ward 1 |
| Osborn | St. Francis |
| Osteen | Ward 1 |
| O'steen | St. Francis |
| Otey | Hurricane, Union, Ward 1 |
| Ots | Cache |
| Overall | Ward 3 |
| Overman | Mainshore |
| Overmiller | Ward 2 |
| Overtine | Ward 3 |
| Overton | St. Francis, Union, Ward 1 |
| Owen | Hurricane |
| Owens | Cache, Lake, Mainshore, St. Francis |
| Owens | Union, Ward 1, Ward 2, Ward 3 |
| Oxley | Ward 1 |
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