| Name of the place | CERL ID of a place | Country | Longitude | Latitude | |
|---|---|---|---|---|---|
| Inverness | cnl00026662 | Scotland | -4.21666666666667 | 57.4830555555556 | |
| Ipswich | cnl00007041 | England | 1.17 | 52.08 | |
| Irai | cnl00019806 | — | — | — | |
| Iraklion | cnl00029370 | Greece | 25.1330555555556 | 35.3330555555556 | |
| Iran | — | Iran | — | — | |
| Ireland | cnl00003669 | Ireland | — | — | |
| Iron | cnl00023906 | France | — | — | |
| Irvine | cnl00029897 | Scotland | -4.6614 | 55.6201 | |
| Ischitella | cnl00021187 | Italy | 15.9 | 41.9 | |
| Iserlohn | cnl00010347 | Germany | 7.7 | 51.3697222222222 | |
| Isfahan | cnl00004028 | Iran | 51.6497222222222 | 32.6330555555556 | |
| Isle of Man | cnl00000918 | — | — | — | |
| Isleworth (London) | — | England | -0.336 | 51.466 | |
| Islington | cnl00000704 | England | -0.105833333333333 | 51.5327777777778 | |
| Isny | cnl00010353 | Germany | 10.0330555555556 | 47.7 | |
| Israel | cnl00025428 | Israel | — | — | |
| Issoudun | cnl00010356 | France | 2.0 | 46.95 | |
| Issy-l'Évêque | cnl00019009 | France | 3.9667 | 46.7167 | |
| Issy-les-Moulineaux | cnl00018027 | — | 2.26666666666667 | 48.8166666666667 | |
| Istanbul | cnl00030429 | — | 28.9491666666667 | 41.0091666666667 | |
| Italia | cnl00028023 | Italy | — | — | |
| Itzehoe | cnl00010366 | Germany | 9.52 | 53.92 | |
| Izeste | cnl00019592 | France | — | — | |
| Izmir | cnl00030352 | Turkey | 27.1494444444444 | 38.4166666666667 | |
| Iznang | cnl00021092 | — | — | — |