| Familienname | Ortsteil | Hausnummern |
|---|---|---|
| Oberfeld | Gellendorf | 2a |
| Obermeyer | Eschendorf | 63/1 |
| Obermeyer | EschendorfII | 103, 105, 144 |
| Obermüller | Bentlage | 15 |
| Ode | MesumII | 86, 96, 105, 114, 185 |
| Odmiyal | Eschendorf | 53 |
| Oechtering | Hauenhorst | 35 |
| Öchtering | Elte | 7, 12, 23, 43 |
| Öchtering | Rodde | 6 |
| Oelgönne | EschendorfII | 124 |
| Oelrich | Eschendorf | 63 |
| Oelrich | EschendorfII | 148 |
| Oers van | Altenrheine | 76 |
| Oers van | Gellendorf | 47 |
| Oers | EschendorfII | 106 |
| Oesterwieman | MesumK | 40 |
| Ohde | EschendorfII | 111 |
| Ohde | MesumI | 7, 48a, 51 |
| Ohds | EschendorfII | 108 |
| Ohrendorff | Bentlage | 49 |
| Ojik van | Dutum | 57, 58 |
| Olbrich | MesumI | 66 |
| Olgemöller | Rodde | 8a |
| Olthuis | EschendorfII | 144 |
| Olthuis | Gellendorf | 45 |
| Ommen van | Rodde | 27, 48 |
| Oord | EschendorfII | 094 |
| Oorsouw van | Dutum | 31 |
| Oosten van | Dutum | 1 |
| Op de Wegh | EschendorfII | 140 |
| Opdam | EschendorfII | 113 |
| Opdaum | Eschendorf | 49 |
| Opperbeck | Dutum | 31 |
| Ort | Eschendorf | 8a |
| Orthaus | MesumII | 98, 102 |
| Ortmeyer | MesumK | 19, 29 |
| Ortwarth | Dutum | 8 |
| Os van | Gellendorf | 44 |
| Osegge | MesumI | 4, 58, 61, 65 |
| Ossege | Altenrheine | 21a |
| Ossege | MesumII | 82, 131 |
| Ossege | MesumK | 5a, 12a, 28, 36 |
| Ostendorf | Eschendorf | 62 |
| Ostendorf | EschendorfII | 092, 147 |
| Ostendorf | Hauenhorst | 36 |
| Osterbrinck | MesumI | 43a |
| Osterbrinck | MesumII | 93 |
| Osterbrinck | MesumK | 14a |
| Osterfeld | EschendorfII | 101 |
| Osterfeld | Rodde | 3a, 41 |
| Osterhues | Eschendorf | 73 |
| Osterman | Dutum | 31 |
| Osterpohl | Bentlage | 53a |
| Osthoff | Wadelheim | 11 |
| Ostholthoff | Eschendorf | 4a |
| Oswald | Bentlage | 85 |
| Ott | Eschendorf | 72 |
| Otte | EschendorfII | 148 |
| Otte | Gellendorf | 31 |
| Otte | Rodde | 2b, 12b, 15 |
| Otten | Elte | 2a, 4a, 17, 39 |
| Otten | Eschendorf | 63 |
| Otten | MesumI | 22, 48, 59 |
| Otten | MesumII | 80 |
| Otten | MesumK | 12b |
| Ottenhues | Dutum | 2, 2a |
| Ottenhues | EschendorfII | 094, 094 |
| Ottenhues | Wadelheim | 10 |
| Ottenhuis | EschendorfII | 124 |
| Ottenjan | MesumI | 49 |
| Ottenjans | Catenhorn | 1a, 10, 35 |
| Ottenjans | Hauenhorst | 29 |
| Ottenjans | MesumK | 5 |
| Otting | Altenrheine | 4 |
| Otting | Eschendorf | 9 |
| Otting | EschendorfII | 105 |
| Ottman | MesumK | 7 |
| Otto | Eschendorf | 63/1, 81, 83, 89 |
| Otto | EschendorfII | 097, 098, 104, 106, 107, 137, 138, 150 |
| Otto | Gellendorf | 61 |
| Oudshorn | EschendorfII | 122 |
| Outshorn | EschendorfII | 139 |
| Ouverkerk | Gellendorf | 49 |
| Ovel | Bentlage | 3, 31/1 |
| Ovel | Catenhorn | 19 |
| Ovel | Eschendorf | 57 |
| Ovel | Hauenhorst | 19a |
| Ovelgönne | EschendorfII | 095 |
| Over | Hauenhorst | 1a |
| Overbeck | Catenhorn | 2a |
| Overbeck | Dutum | 56 |
| Overbeck | Elte | 18a |
| Overbeck | MesumI | 52 |
| Overesch | Elte | 7, 19, 23 |
| Overesch | MesumI | 12 |
| Overkamp | EschendorfII | 149 |
| Overkämping | Dutum | 45 |
| Overman | Bentlage | 24 |
| Overman | Eschendorf | 7 |
| Overmeyer | Dutum | 44 |
| Overmeyer | Rodde | 6a |