In this section you can find information about the towns included in the study
| Town | Dialects | Maps | Records |
| Itsaso | 7 | ||
| Itsasperri | 0 | ||
| Ituren | 9 | ||
| Iturmendi | 10 | ||
| Iza | 0 | ||
| Izal | 0 | ||
| Izalzu | 0 | ||
| Izurdiaga | 0 | ||
| Jatsu | 5 | ||
| Jauntsarats | 4 | ||
| Jaurrieta | 22 | ||
| Juxue | 1 | ||
| Labets-Biscay | 0 | ||
| Labourd | 7 | ||
| Labourd (low-navarrese - navarro-labourdin) | 16 | ||
| Lacabe | 0 | ||
| Lacarre | 3 | ||
| Lakuntza | 18 | ||
| Lantabat | 3 | ||
| Lantz | 3 | ||
| Larceveau-Arros-Cibits | 6 | ||
| Larraintzar | 5 | ||
| Larraona | 0 | ||
| Larrasoaña | 2 | ||
| Larráyoz | 0 | ||
| Larribar-Sorhapuru | 3 | ||
| Larrión (Allín) | 0 | ||
| Larumbe | 0 | ||
| Lasse | 15 | ||
| Latasa (Imotz) | 4 | ||
| Latasa (Odieta) | 5 | ||
| Leazkue | 1 | ||
| Lecumberry | 1 | ||
| Legarda | 0 | ||
| Legaria | 0 | ||
| Legasa | 9 | ||
| Leitza | 929 | ||
| Lekaroz | 42 | ||
| Lekunberri | 6 | ||
| Leoz | 0 | ||
| Leranotz | 6 | ||
| Lerate | 1 | ||
| Lerga | 1 | ||
| Les Aldudes | 21 | ||
| Lesaka | 58 | ||
| Lete | 0 | ||
| Lezaeta | 5 | ||
| Lezáun | 0 | ||
| Lintzoain | 45 | ||
| Lizarraga | 17 |
