| 52658 | Ignacio Larraza | 1 | 1760 | 1760 |
| 51707 | Ignacio Larreta Azelain | 1 | 1701 | 1701 |
| 53325 | Ignacio Larrondobuño | 1 | 1693 | 1693 |
| 52186 | Ignacio Larrunbide | 2 | 1666 | 1735 |
| 48162 | Ignacio Lertxundi Lizola | 1 | 1761 | 1761 |
| 48122 | Ignacio Manuel Ubarkalde Miriategi | 1 | 1746 | 1746 |
| 53623 | Ignacio Maria Lizaso | 1 | 1912 | 1912 |
| 43144 | Ignacio Mayoz Iruretagoyena | 1 | 1961 | 1961 |
| 48139 | Ignacio Mendiguren Eizmendi | 1 | 1755 | 1755 |
| 42461 | Ignacio Narbarte | 1 | 1969 | 1969 |
| 52805 | Ignacio Ondarza | 1 | 1622 | 1622 |
| 52993 | Ignacio Oreta | 1 | 1697 | 1697 |
| 53155 | Ignacio Ostolaza | 2 | 1713 | 1775 |
| 48060 | Ignacio Ostolaza Beroiz | 1 | 1669 | 1669 |
| 43552 | Ignacio Puldain Loidi | 1 | 1971 | 1971 |
| 51902 | Ignacio Rezola | 7 | 1770 | 1782 |
| 52093 | Ignacio Sanzetenea | 1 | 1770 | 1770 |
| 42537 | Ignacio Sarasola Azkue | 1 | 1974 | 1974 |
| 53440 | Ignacio Segurola | 1 | 1801 | 1801 |
| 51819 | Ignacio Sorarrain | 7 | 1692 | 1765 |
| 48062 | Ignacio Sorarrain Igola | 1 | 1670 | 1670 |
| 48181 | Ignacio Sorarrain Lizola | 1 | 1764 | 1764 |
| 48055 | Ignacio Tapia Etxabe | 1 | 1659 | 1659 |
| 43162 | Ignacio Txapartegi Vitoria | 1 | 1971 | 1971 |
| 51778 | Ignacio Ubarkalde | 1 | 1747 | 1747 |
| 51821 | Ignacio Ulanga | 1 | 1760 | 1760 |
| 51769 | Ignacio Uranga | 3 | 1746 | 1794 |
| 52235 | Ignacio Urkia | 1 | 1809 | 1809 |
| 52322 | Ignacio Urkidizar | 2 | 1693 | 1693 |
| 52603 | Ignacio Uzkudun | 1 | 1805 | 1805 |
| 52181 | Ignacio Zabala | 1 | 1830 | 1830 |
| 53081 | Ignacio Zaldua | 1 | 1702 | 1702 |
| 52579 | Ignacio Zatarain | 1 | 1784 | 1784 |
| 52428 | Ignacio Zendoia | 1 | 1799 | 1799 |
| 53363 | Ignacio Zubeldia | 1 | 1745 | 1745 |
| 52096 | Ignacio Zubiaurre | 1 | 1771 | 1771 |
| 48249 | Ignazio Gorostidi | 1 | 1955 | 1955 |
| 48227 | Ildefonso Rekondo Iturzaeta | 1 | 1790 | 1790 |
| 42536 | Indugon S.A | 1 | 1974 | 1974 |
| 43033 | Industrias MAF | 1 | 1972 | 1972 |
| 42395 | Industrias Quimicas del Urumea | 1 | 1965 | 1965 |
| 43427 | Ines Markegain Oilogo | 1 | 1965 | 1965 |
| 42477 | Ines Murua Arozena | 2 | 1970 | 1971 |
| 51763 | Inocencio Uzkudun | 2 | 1718 | 1746 |
| 43532 | Iparraldeko Konfederazio Hidrografikoa | 1 | 1969 | 1969 |
| 53149 | Isabel Sorarrain | 1 | 1713 | 1713 |
| 53222 | Isabela Irazusta | 2 | 1729 | 1729 |
| 42266 | Isidoro Mujika Arrue | 1 | 1961 | 1961 |
| 42467 | Isidro Iraola | 1 | 1971 | 1971 |
| 43424 | Isidro Iturzaeta | 1 | 1965 | 1965 |
