In this section you can find information about the towns included in the study
| Town | Dialects | Maps | Records |
| St-Just-Ibarre | 2 | ||
| St-Martin-d´Arbéroue | 6 | ||
| St-Martin-d´Arrossa | 1 | ||
| St-Michel | 10 | ||
| St-Palais | 6 | ||
| Suarbe | 29 | ||
| Suhescun | 3 | ||
| Sunbilla | 27 | ||
| Tajonar | 1 | ||
| Tiebas | 0 | ||
| Tirapu | 0 | ||
| Úcar | 0 | ||
| Udabe | 5 | ||
| Uhart-Cize | 9 | ||
| Uhart-Mixe | 4 | ||
| Uharte-Arakil | 12 | ||
| Uitzi | 7 | ||
| Ujué | 1 | ||
| Unanu | 44 | ||
| Unciti | 0 | ||
| Unzu | 2 | ||
| Unzué | 0 | ||
| Urdaitz/Urdániz | 2 | ||
| Urdánoz | 1 | ||
| Urdazubi/Urdax | 9 | ||
| Urdiain | 129 | ||
| Urdíroz | 0 | ||
| Urepel | 30 | ||
| Úriz | 0 | ||
| Urritza | 3 | ||
| Urritzola | 8 | ||
| Urritzola-Galain | 4 | ||
| Urrotz | 27 | ||
| Urroz-Villa | 0 | ||
| Urtasun | 1 | ||
| Urzainqui | 0 | ||
| Uscarrés | 0 | ||
| Usetxi | 63 | ||
| Usi | 0 | ||
| Usoz | 0 | ||
| Uterga | 3 | ||
| Uztárroz | 11 | ||
| Uztegi | 8 | ||
| Vidángoz | 3 | ||
| Villanueva de Arce | 0 | ||
| Villanueva de Yerri | 0 | ||
| Villatuerta | 0 | ||
| Zabaldika | 1 | ||
| Zabalza | 0 | ||
| Zandio | 0 |
