รายชื่อภูมิภาค
- 8121 GA - Olst, Olst-Wijhe, Overijssel
- 8121 GB - Olst, Olst-Wijhe, Overijssel
- 8121 GC - Olst, Olst-Wijhe, Overijssel
- 8121 GD - Olst, Olst-Wijhe, Overijssel
- 8121 GE - Olst, Olst-Wijhe, Overijssel
- 8121 GG - Olst, Olst-Wijhe, Overijssel
- 8121 GH - Olst, Olst-Wijhe, Overijssel
- 8121 GJ - Olst, Olst-Wijhe, Overijssel
- 8121 GK - Olst, Olst-Wijhe, Overijssel
- 8121 GL - Olst, Olst-Wijhe, Overijssel
- 8121 GM - Olst, Olst-Wijhe, Overijssel
- 8121 GN - Olst, Olst-Wijhe, Overijssel
- 8121 GP - Olst, Olst-Wijhe, Overijssel
- 8121 GR - Olst, Olst-Wijhe, Overijssel
- 8121 GS - Olst, Olst-Wijhe, Overijssel
- 8121 GT - Olst, Olst-Wijhe, Overijssel
- 8121 GV - Olst, Olst-Wijhe, Overijssel
- 8121 GW - Olst, Olst-Wijhe, Overijssel
- 8121 GX - Olst, Olst-Wijhe, Overijssel
- 8121 GZ - Olst, Olst-Wijhe, Overijssel