| Elva 555 borehole | Estonia | 58.2230, 26.4057 | 10 | 85 | 131 | 108 | |
| Elva 262 borehole | Estonia | 58.2411, 26.4580 | 5 | 3 | 10 | 48 | |
| Ellavere borehole, Järvamaa | Estonia | 59.0115, 26.0234 | 19 | 58 | 197 | 272 | |
| Elda 870 borehole | Estonia | 58.2904, 21.8453 | 0 | 1 | 6 | 6 | |
| Elbiku F-330 borehole | Estonia | 59.1524, 23.5405 | 5 | 0 | 12 | 9 | |
| Englema F-333 borehole | Estonia | 59.2333, 23.8708 | 3 | 22 | 26 | 25 | |
| Kukruse borehole | Estonia | 59.3982, 27.3499 | 0 | 0 | 0 | 0 | |
| Kotly borehole | Russia | 59.6075, 28.7692 | 0 | 0 | 0 | 0 | |
| Kuressaare K3 borehole | Estonia | 58.2531, 22.4695 | 5 | 21 | 133 | 267 | |
| Krasnodudovo borehole, Pskov oblast | Russia | 57.5834, 27.9475 | 2 | 0 | 0 | 0 | |
| Kriukai 146 borehole | Lithuania | 56.3000, 23.8000 | 5 | 8 | 20 | 19 | |
| Kroogi K21 borehole | Estonia | 59.0097, 22.6639 | 0 | 0 | 0 | 0 | |
| Kübassaare 518 borehole | Estonia | 58.4410, 23.3109 | 2 | 0 | 18 | 55 | |
| Küdema 631 borehole | Estonia | 58.4646, 22.3185 | 0 | 0 | 0 | 0 | |
| Kugalepa 633 borehole | Estonia | 58.5082, 22.2056 | 1 | 1 | 2 | 4 | |
| Kuijõe F-326 borehole | Estonia | 59.0992, 24.0327 | 6 | 0 | 19 | 19 | |
| Kuie F-341 borehole, Läänemaa | Estonia | 59.0863, 24.0129 | 0 | 0 | 0 | 0 | |
| Kuke F-262 borehole | Estonia | 59.2623, 26.1098 | 7 | 0 | 34 | 34 | |
| Kuressaare SG2 borehole | Estonia | 58.2522, 22.4728 | 29 | 993 | 636 | 198 | |
| Kukka K44 borehole | Estonia | 58.9760, 22.8645 | 0 | 0 | 0 | 0 | |
| Kotlandi 866 borehole | Estonia | 58.2208, 22.0572 | 2 | 7 | 19 | 25 | |
| Külaküla K29 borehole | Estonia | 58.7750, 22.4906 | 2 | 3 | 33 | 0 | |
| Kullamaa D-153 borehole | Estonia | 58.8604, 24.0753 | 12 | 26 | 21 | 9 | |
| Kunda 62 borehole | Estonia | 59.4968, 26.5172 | 2 | 6 | 0 | 0 | |
| Kunda 19 borehole | Estonia | | 2 | 0 | 0 | 0 | |
