| Název | Obyvatele | Nad. výška | Souřadnice | 
| Oba | 
 | 513 m | 43°7' N; 2°43' W | 
| Obecuri (Obécuri) | 
 | 65 m | 43°16' N; 3°8' W | 
| Ocamica | 
 | 98 m | 43°19' N; 2°31' W | 
| Ocariz (Ocáriz) | 
 | 818 m | 42°49' N; 2°21' W | 
| Ocerinmendi | 
 | 312 m | 43°6' N; 2°45' W | 
| Ocerinmendio | 
 | 
 | 43°6' N; 2°45' W | 
| Ochandiano | 
 | 560 m | 43°1' N; 2°38' W | 
| Ocio | 
 | 612 m | 42°38' N; 2°49' W | 
| Ocola | 
 | 26 m | 43°19' N; 2°27' W | 
| Odiaga | 
 | 142 m | 43°19' N; 2°31' W | 
| Ogaragoitia | 
 | 319 m | 43°7' N; 2°45' W | 
| Oiquina | 
 | 106 m | 43°16' N; 2°13' W | 
| Olabarrieta | 
 | 353 m | 43°1' N; 2°22' W | 
| Olabarri | 
 | 251 m | 43°10' N; 2°46' W | 
| Olabazar (Olábazar) | 
 | 
 | 43°4' N; 3°1' W | 
| Olabe | 
 | 109 m | 43°22' N; 2°34' W | 
| Olaberria (Olaberría) | 930 | 269 m | 43°1' N; 2°12' W | 
| Olabezar (Olábezar) | 
 | 217 m | 43°4' N; 3°1' W | 
| Olacueta | 
 | 190 m | 43°10' N; 2°34' W | 
| Olaeta | 
 | 638 m | 43°2' N; 2°37' W | 
| Olagorta | 
 | 144 m | 43°22' N; 2°36' W | 
| Olano | 
 | 260 m | 43°4' N; 2°6' W | 
| Olarra | 
 | 124 m | 43°8' N; 2°46' W | 
| Olavarri | 
 | 251 m | 43°10' N; 2°46' W | 
| Olave | 
 | 190 m | 43°10' N; 2°34' W | 
| Olazabal (Olazábal) | 
 | 327 m | 43°7' N; 2°36' W | 
| Ollavarre (Ollávarre) | 
 | 536 m | 42°49' N; 2°49' W | 
| Olquina | 
 | 
 | 43°16' N; 2°13' W | 
| Oma | 
 | 142 m | 43°19' N; 2°37' W | 
| Onarte (Ońarte) | 
 | 200 m | 43°17' N; 2°46' W | 
| Onate (Ońate) | 10 711 | 252 m | 43°1' N; 2°23' W | 
| Onatz (Ońatz) | 
 | 222 m | 43°10' N; 2°16' W | 
| Ondarra | 
 | 311 m | 42°58' N; 2°16' W | 
| Ondarroa (Ondárroa) | 9 712 | 16 m | 43°19' N; 2°25' W | 
| Ondategui (Ondátegui) | 
 | 573 m | 42°57' N; 2°43' W | 
| Onraita | 
 | 956 m | 42°47' N; 2°23' W | 
| Opacua | 
 | 898 m | 42°49' N; 2°21' W | 
| Oquina | 
 | 911 m | 42°46' N; 2°34' W | 
| Orbiso | 
 | 575 m | 42°42' N; 2°19' W | 
| Ordonana (Ordońana) | 
 | 591 m | 42°52' N; 2°22' W | 
| Ordorica | 
 | 108 m | 43°16' N; 2°40' W | 
| Orduna (Orduńa) | 4 072 | 299 m | 42°58' N; 3°0' W | 
| Oreitia | 
 | 532 m | 42°51' N; 2°32' W | 
| Oreja | 
 | 480 m | 43°6' N; 2°1' W | 
| Orendain (Orendain) | 164 | 317 m | 43°4' N; 2°7' W | 
| Orenin (Orenín) | 
 | 531 m | 42°53' N; 2°32' W | 
| Oria (Oria) | 17 378 | 90 m | 43°15' N; 2°1' W | 
| Orio (Orio) | 4 586 | 33 m | 43°16' N; 2°7' W | 
| Ormaiztegui (Ormáiztegui) | 
 | 260 m | 43°2' N; 2°15' W | 
| Ormijana | 
 | 572 m | 42°49' N; 2°55' W | 
| Orobio | 
 | 279 m | 43°12' N; 2°38' W | 
| Oro | 
 | 406 m | 43°1' N; 2°28' W | 
| Orozqueta (Orózqueta) | 
 | 
 | 43°10' N; 2°38' W | 
| Ortuella (Ortuella) | 8 618 | 55 m | 43°19' N; 3°4' W | 
| Ortuzar (Ortúzar) | 
 | 257 m | 43°8' N; 2°38' W | 
| Osma | 
 | 560 m | 42°52' N; 3°4' W | 
| Otazu | 
 | 538 m | 42°49' N; 2°37' W | 
| Otceremendi | 
 | 
 | 43°6' N; 2°45' W | 
| Oteo | 
 | 707 m | 42°43' N; 2°22' W | 
| Otides | 
 | 263 m | 43°13' N; 3°22' W | 
| Otzaurte | 
 | 679 m | 42°55' N; 2°15' W | 
| Oyardo | 
 | 623 m | 42°58' N; 2°55' W | 
| Oyon (Oyón) | 2 778 | 395 m | 42°30' N; 2°25' W | 
| Ozaeta | 
 | 278 m | 42°55' N; 2°30' W | 
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