| Korjuse 15 borehole | Estonia | 59.6N, 25.9E | 7 | 25 | 30 | 52 | |
| Kõrkküla 726 borehole | Estonia | 58.3N, 22.3E | 2 | 11 | 0 | 0 | |
| Kõrkküla 863 borehole | Estonia | 58.3N, 22.2E | 10 | 835 | 140 | 400 | |
| Kõrkküla 986 borehole | Estonia | 58.3N, 22.3E | 0 | 0 | 0 | 0 | |
| Korõtno borehole | Russia | | 2 | 6 | 0 | 0 | |
| Kõruse 797 borehole | Estonia | 58.5N, 22.0E | 0 | 0 | 0 | 0 | |
| Korõtno 2 borehole | Russia | 58.5N, 28.2E | 3 | 2 | 19 | 29 | |
| Kose 2323 borehole | Estonia | 58.7N, 26.9E | 8 | 89 | 423 | 79 | |
| Kose-Uuemõisa F-285 borehole | Estonia | 59.2N, 25.1E | 8 | 5 | 28 | 26 | |
| Kostivere F-117 borehole | Estonia | 59.4N, 25.1E | 4 | 1 | 63 | 63 | |
| Kostivere 5 borehole | Estonia | 59.4N, 25.1E | 2 | 1 | 0 | 0 | |
| Kostovo 13 borehole, Leningrad Oblast | Russia | 59.5N, 31.2E | 7 | 67 | 243 | 17 | |
| Kootsaare K144 borehole | Estonia | 59.0N, 22.5E | 1 | 0 | 0 | 0 | |
| Laeva 10 borehole | Estonia | 58.5N, 26.4E | 8 | 39 | 131 | 63 | |
| Kuressaare 804 borehole | Estonia | 58.3N, 22.5E | 5 | 68 | 9 | 9 | |
| Käru 401 puurauk | Estonia | 58.8N, 25.1E | 3 | 12 | 30 | 49 | |
| Käsmu 14 borehole | Estonia | 59.6N, 25.9E | 5 | 12 | 14 | 6 | |
| Laadjala 952 borehole | Estonia | 58.3N, 22.5E | 0 | 0 | 2 | 0 | |
| Läägi 887 borehole | Estonia | 58.4N, 22.0E | 0 | 0 | 0 | 0 | |
| Laanemetsa 100 borehole | Estonia | | 13 | 5 | 60 | 207 | |
| Laanemetsa 70 borehole | Estonia | 57.7N, 26.3E | 14 | 13 | 15 | 13 | |
| Laasi K138 borehole | Estonia | 58.9N, 22.3E | 0 | 0 | 0 | 0 | |
| Laborje borehole | | | 1 | 0 | 1 | 1 | |
| Ladushkino 4 borehole, Kaliningrad oblast | Russia | | 3 | 4 | 23 | 0 | |
| Laekvere 298 borehole | Estonia | | 3 | 0 | 0 | 0 | |
