Both county names and abbreviations are accepted:
| Estonia | County | Harju | 37 | Harjumaa | |
| Estonia | County | Hiiu | 39 | Hiiumaa | |
| Estonia | County | Ida-Viru | 44 | Ida-Virumaa | |
| Estonia | County | Järva | 51 | Järvamaa | |
| Estonia | County | Jõgeva | 49 | Jõgevamaa | |
| Estonia | County | Lääne | 57 | Läänemaa | |
| Estonia | County | Lääne-Viru | 59 | Lääne-Virumaa | |
| Estonia | County | Pärnu | 67 | Pärnumaa | |
| Estonia | County | Põlva | 65 | Põlvamaa | |
| Estonia | County | Rapla | 70 | Raplamaa | |
| Estonia | County | Saare | 74 | Saaremaa | |
| Estonia | County | Tartu | 78 | Tartumaa | |
| Estonia | County | Valga | 82 | Valgamaa | |
| Estonia | County | Viljandi | 84 | Viljandimaa | |
| Estonia | County | Võru | 86 | Võrumaa |