| 52457 | Julián Sorarrain Sarasti | 1 | 1885 | 1885 |
| 53576 | Julián Usandizaga | 1 | 1878 | 1878 |
| 53572 | Juliana Irazu | 1 | 1878 | 1878 |
| 53665 | Juliana Irazusta | 1 | 1875 | 1875 |
| 42976 | Juliana Tapia Elola | 1 | 1965 | 1965 |
| 48277 | Julio Barcena | 1 | 1956 | 1956 |
| 43410 | Julio Bárcena García | 1 | 1952 | 1952 |
| 43505 | Junkers | 1 | 1965 | 1965 |
| 43024 | Justa Legarra Saizar | 1 | 1951 | 1951 |
| 53661 | Justa Zubizarreta | 1 | 1869 | 1869 |
| 52242 | Justina Sorarrain | 1 | 1640 | 1640 |
| 48255 | Karlos Iturbe | 1 | 1956 | 1956 |
| 52328 | Katalina Roteta | 1 | 1693 | 1693 |
| 42398 | Keelavite Hispania S.A. | 7 | 1960 | 1973 |
| 46700 | Kilometroak 2002 | 1 | 2002 | 2002 |
| 46487 | Kilometroak 97 | 1 | 1997 | 1997 |
| 48282 | La Estrella aseguru etxea | 1 | 1957 | 1957 |
| 46064 | Laura Troitiño Suarez | 1 | 1993 | 1993 |
| 47240 | Lazaro Amas Lizardi | 1 | 1659 | 1659 |
| 52927 | Lázaro Beobide | 2 | 1687 | 1689 |
| 53265 | Lázaro Esnal | 1 | 1769 | 1769 |
| 47663 | Lazaro Landa | 1 | 1764 | 1764 |
| 52203 | Lázaro Lizardi | 4 | 1687 | 1776 |
| 52378 | Lázaro Tapia | 1 | 1715 | 1715 |
| 52856 | León Etxarri | 1 | 1735 | 1735 |
| 51840 | León Lizaso | 2 | 1747 | 1765 |
| 53567 | Leonardo Lizaso | 1 | 1877 | 1877 |
| 53629 | Lino Beldarrain | 1 | 1879 | 1879 |
| 51845 | Lorenzo Amondarain | 2 | 1764 | 1766 |
| 52787 | Lorenzo Amundarain | 1 | 1798 | 1798 |
| 52724 | Lorenzo Brit | 1 | 1816 | 1816 |
| 43564 | Lorenzo Domínguez | 1 | 1972 | 1972 |
| 48004 | Lorenzo Garro Sarasti | 1 | 1649 | 1649 |
| 53365 | Lorenzo Jauregi | 1 | 1745 | 1745 |
| 52320 | Lorenzo Juanbeltz | 1 | 1693 | 1693 |
| 52621 | Lorenzo Korta | 3 | 1815 | 1824 |
| 42445 | Lorenzo Otegi | 1 | 1967 | 1967 |
| 52390 | Lorenzo Toledo | 2 | 1667 | 1767 |
| 52168 | Lorenzo Txarola | 1 | 1729 | 1729 |
| 52169 | Lorenzo Zatarain | 1 | 1729 | 1729 |
| 52097 | Lorenzo Zubieta | 1 | 1771 | 1771 |
| 43420 | Loretxu Agote Ugartemendia | 1 | 1967 | 1967 |
| 42314 | Los Luises | 1 | 1965 | 1965 |
| 42317 | Los Luises parroki elkartea | 1 | 1973 | 1973 |
| 51813 | Lucas Elola | 1 | 1759 | 1759 |
| 53111 | Lucas Galardi | 1 | 1707 | 1707 |
| 51849 | Lucas Galdós | 1 | 1766 | 1766 |
| 52808 | Lucas Lertxundi | 2 | 1721 | 1733 |
| 53360 | Lucas Olano | 1 | 1745 | 1745 |
| 53335 | Lucía Ilardia | 1 | 1709 | 1709 |
