| Town Name | Type | Region | Province / State | County | Municipality | Population | Latitude | Longitude | |
|---|---|---|---|---|---|---|---|---|---|
| Idiazabal | village | 2082 | 43.010677 | -2.233613 | Map | ||||
| Igorre | village | Euskal Herria / País | Bizkaia / Vizcaya | 2467 | 43.164246 | -2.778344 | Map | ||
| Igualada | town | 35933 | 41.578884 | 1.617567 | Map | ||||
| Illescas | town | Castilla-La Mancha | Toledo | 17655 | 40.124844 | -3.849269 | Map | ||
| Íllora | town | 5389 | 37.286839 | -3.878356 | Map | ||||
| Illueca | village | 3348 | 41.538029 | -1.628363 | Map | ||||
| Inca | town | Illes Balears | Illes Balears | 29321 | 39.721146 | 2.911149 | Map | ||
| Iniesta | village | 4678 | 39.444553 | -1.748748 | Map | ||||
| Irun | town | Euskadi | Gipuzkoa | 61102 | 43.338318 | -1.788809 | Map | ||
| Irura | village | Euskal Herria / País | Gipuzkoa | 1640 | 43.167534 | -2.067222 | Map | ||
| Irurtzun | village | 2230 | 42.918438 | -1.828672 | Map | ||||
| Íscar | village | 6876 | 41.363449 | -4.533895 | Map | ||||
| Isla Cristina | town | 19103 | 37.203693 | -7.323891 | Map | ||||
| Isla Mayor | village | 5930 | 37.132465 | -6.164808 | Map | ||||
| Istán | village | 1486 | 36.583145 | -4.949662 | Map | ||||
| Itrabo | village | 1152 | 36.799957 | -3.639493 | Map | ||||
| Iurreta | village | Euskadi | Bizkaia | 2912 | 43.176319 | -2.633858 | Map | ||
| Ivars d'Urgell | village | 1456 | 41.681889 | 0.987808 | Map | ||||
| Iznájar | village | 2118 | 37.256725 | -4.310091 | Map | ||||
| Iznalloz | village | 3565 | 37.392078 | -3.527213 | Map | ||||
| Iznatoraf | village | 1023 | 38.157585 | -3.032568 | Map | ||||
| Jabalquinto | village | 2337 | 38.019527 | -3.725588 | Map | ||||
| Jabugo | village | Andalucía | Huelva | 1321 | 37.916733 | -6.728532 | Map | ||
| Jaca | town | 12434 | 42.569199 | -0.549520 | Map | ||||
| Jacarilla | village | 2100 | 38.061344 | -0.868085 | Map |