| Elva 555 borehole | Estonia | 58.2N, 26.4E | 10 | 85 | 131 | 108 | |
| Elva 262 borehole | Estonia | 58.2N, 26.5E | 5 | 3 | 10 | 48 | |
| Ellavere borehole, Järvamaa | Estonia | 59.0N, 26.0E | 19 | 58 | 197 | 272 | |
| Elda 870 borehole | Estonia | 58.3N, 21.8E | 0 | 1 | 6 | 6 | |
| Elbiku F-330 borehole | Estonia | 59.2N, 23.5E | 5 | 0 | 12 | 9 | |
| Englema F-333 borehole | Estonia | 59.2N, 23.9E | 3 | 22 | 26 | 25 | |
| Kukruse borehole | Estonia | 59.4N, 27.3E | 0 | 0 | 0 | 0 | |
| Kotly borehole | Russia | 59.6N, 28.8E | 0 | 0 | 0 | 0 | |
| Kuressaare K3 borehole | Estonia | 58.3N, 22.5E | 5 | 21 | 133 | 267 | |
| Krasnodudovo borehole, Pskov oblast | Russia | 57.6N, 27.9E | 2 | 0 | 0 | 0 | |
| Kriukai 146 borehole | Lithuania | 56.3N, 23.8E | 5 | 8 | 20 | 19 | |
| Kroogi K21 borehole | Estonia | 59.0N, 22.7E | 0 | 0 | 0 | 0 | |
| Kübassaare 518 borehole | Estonia | 58.4N, 23.3E | 2 | 0 | 18 | 55 | |
| Küdema 631 borehole | Estonia | 58.5N, 22.3E | 0 | 0 | 0 | 0 | |
| Kugalepa 633 borehole | Estonia | 58.5N, 22.2E | 1 | 1 | 2 | 4 | |
| Kuijõe F-326 borehole | Estonia | 59.1N, 24.0E | 6 | 0 | 19 | 19 | |
| Kuie F-341 borehole, Läänemaa | Estonia | 59.1N, 24.0E | 0 | 0 | 0 | 0 | |
| Kuke F-262 borehole | Estonia | 59.3N, 26.1E | 7 | 0 | 34 | 34 | |
| Kuressaare SG2 borehole | Estonia | 58.3N, 22.5E | 29 | 993 | 636 | 198 | |
| Kukka K44 borehole | Estonia | 59.0N, 22.9E | 0 | 0 | 0 | 0 | |
| Kotlandi 866 borehole | Estonia | 58.2N, 22.1E | 2 | 7 | 19 | 25 | |
| Külaküla K29 borehole | Estonia | 58.8N, 22.5E | 2 | 3 | 33 | 0 | |
| Kullamaa D-153 borehole | Estonia | 58.9N, 24.1E | 12 | 26 | 21 | 9 | |
| Kunda 62 borehole | Estonia | 59.5N, 26.5E | 2 | 6 | 0 | 0 | |
| Kunda 19 borehole | Estonia | | 2 | 0 | 0 | 0 | |