Códigos postales del 20001 al 20870
| Código postal | Entidad de población | Municipio principal | Direcciones |
|---|---|---|---|
| 20001 | Donostia/San Sebastián | Donostia/San Sebastián | 321 |
| 20002 | Donostia/San Sebastián | Donostia/San Sebastián | 278 |
| 20003 | Donostia/San Sebastián | Donostia/San Sebastián | 573 |
| 20004 | Donostia/San Sebastián | Donostia/San Sebastián | 221 |
| 20005 | Donostia/San Sebastián | Donostia/San Sebastián | 263 |
| 20006 | Donostia/San Sebastián | Donostia/San Sebastián | 387 |
| 20007 | Donostia/San Sebastián | Donostia/San Sebastián | 258 |
| 20008 | Donostia/San Sebastián | Donostia/San Sebastián | 1.049 |
| 20009 | Donostia/San Sebastián | Donostia/San Sebastián | 1.550 |
| 20010 | Donostia/San Sebastián | Donostia/San Sebastián | 192 |
| 20011 | Donostia/San Sebastián | Donostia/San Sebastián | 334 |
| 20012 | Donostia/San Sebastián | Donostia/San Sebastián | 932 |
| 20013 | Donostia/San Sebastián | Donostia/San Sebastián | 1.012 |
| 20014 | Donostia/San Sebastián | Donostia/San Sebastián +1 | 1.302 |
| 20015 | Donostia/San Sebastián | Donostia/San Sebastián | 1.235 |
| 20016 | Donostia/San Sebastián | Donostia/San Sebastián | 328 |
| 20017 | Donostia/San Sebastián | Donostia/San Sebastián +2 | 1.214 |
| 20018 | Donostia/San Sebastián | Donostia/San Sebastián | 1.697 |
| 20100 | Errenteria | Errenteria +2 | 2.759 |
| 20110 | Pasai Trintxerpe | Pasaia +1 | 850 |
| 20115 | Astigarraga | Astigarraga +1 | 637 |
| 20120 | Hernani | Hernani +1 | 1.705 |
| 20128 | Ereñotzu | Hernani | 164 |
| 20130 | Urnieta | Urnieta | 895 |
| 20140 | Andoain | Andoain | 1.042 |
| 20150 | Villabona | Villabona +2 | 1.050 |
| 20159 | Asteasu | Asteasu +3 | 770 |
| 20160 | Lasarte-Oria | Lasarte-Oria +2 | 1.229 |
| 20170 | Usurbil | Usurbil | 934 |
| 20180 | Elizalde | Oiartzun | 2.278 |
| 20200 | Beasain | Beasain +1 | 719 |
| 20210 | Lazkao | Lazkao | 678 |
| 20211 | Helbarrena | Ataun | 465 |
| 20212 | Olaberria | Olaberria | 350 |
| 20213 | Idiazabal | Idiazabal | 593 |
| 20214 | Segura | Segura +2 | 665 |
| 20215 | Zegama | Zegama | 422 |
| 20216 | Ormaiztegi | Ormaiztegi +1 | 200 |
| 20217 | Gabiria | Gabiria | 202 |
| 20218 | Salbatore | Beasain +2 | 241 |
| 20220 | Brinkola | Legazpi +1 | 209 |
| 20230 | Legazpi | Legazpi | 675 |
| 20240 | Ordizia | Ordizia | 690 |
| 20247 | Zaldibia | Zaldibia | 374 |
| 20248 | Altzaga | Gaintza +3 | 218 |
| 20249 | Itsasondo | Itsasondo +1 | 188 |
| 20250 | Legorreta | Legorreta | 315 |
| 20259 | Baliarrain | Baliarrain | 71 |
| 20260 | Alegia | Alegia | 350 |
| 20267 | Ikaztegieta | Ikaztegieta +1 | 223 |
| 20268 | Amezketa | Amezketa +4 | 554 |
| 20269 | Abaltzisketa | Abaltzisketa +1 | 272 |
| 20270 | Anoeta | Anoeta +2 | 249 |
| 20271 | Irura | Irura | 213 |
| 20280 | Hondarribia | Hondarribia | 2.462 |
| 20301 | Irun | Irun +1 | 655 |
| 20302 | Irun | Irun | 493 |
| 20303 | Irun | Irun | 1.066 |
| 20304 | Irun | Irun | 827 |
| 20305 | Irun | Irun +1 | 2.170 |
| 20400 | Tolosa | Tolosa +5 | 1.852 |
| 20490 | Lizartza | Lizartza +2 | 285 |
| 20491 | Belauntza | Belauntza +4 | 308 |
| 20492 | Berastegi | Berastegi +1 | 364 |
| 20493 | Berrobi | Berrobi +2 | 254 |
| 20494 | Hernialde | Alkiza +1 | 258 |
| 20495 | Albiztur | Albiztur | 164 |
| 20496 | Bidania | Bidania-Goiatz +1 | 253 |
| 20500 | Arrasate/Mondragón | Arrasate/Mondragón | 1.706 |
| 20530 | Leintz-Gatzaga | Eskoriatza +1 | 408 |
| 20540 | Eskoriatza | Eskoriatza | 362 |
| 20550 | Aretxabaleta | Aretxabaleta +1 | 681 |
| 20560 | Oñati | Oñati | 379 |
| 20567 | Araotz | Oñati | 148 |
| 20568 | Uribarri | Oñati | 73 |
| 20569 | Oñati | Oñati | 1.027 |
| 20570 | Bergara | Bergara +1 | 1.384 |
| 20577 | Antzuola | Antzuola | 355 |
| 20578 | Angiozar | Bergara | 162 |
| 20579 | Ubera | Bergara | 91 |
| 20580 | Osintxu | Bergara | 106 |
| 20590 | Soraluze-Placencia de las Armas | Soraluze-Placencia de las Armas | 440 |
| 20600 | Eibar | Eibar | 1.533 |
| 20690 | Elgeta | Elgeta | 305 |
| 20700 | Zumarraga | Zumarraga +1 | 1.501 |
| 20709 | Anduaga (Santa Lutzia) | Ezkio-Itsaso | 376 |
| 20710 | Zumarraga | Zumarraga | 7 |
| 20720 | Azkoitia | Azkoitia | 1.424 |
| 20730 | Azpeitia | Azpeitia | 1.244 |
| 20737 | Errezil | Errezil | 330 |
| 20738 | Urrestilla | Azpeitia +1 | 394 |
| 20739 | Beizama | Beizama +1 | 110 |
| 20740 | Zestoa | Zestoa | 305 |
| 20749 | Aizarnazabal | Zestoa +2 | 777 |
| 20750 | Zumaia | Zumaia | 730 |
| 20759 | Oikia | Zumaia | 217 |
| 20800 | Zarautz | Zarautz +2 | 1.824 |
| 20808 | Getaria | Getaria | 524 |
| 20809 | Aia | Aia | 444 |
| 20810 | Orio | Orio +1 | 805 |
| 20820 | Deba | Deba +1 | 462 |
| 20829 | Itziar | Deba | 433 |
| 20830 | Mutriku | Mutriku +1 | 708 |
| 20850 | Mendarozabal | Mendaro | 412 |
| 20860 | Altzola | Elgoibar | 41 |
| 20870 | Elgoibar | Elgoibar | 1.006 |