All available race results Geert-Jan Jonkman
| Date | Race | Rank |
| 06/05 | Omloop van de Alblasserwaard | 18 |
Rider information for 2006
| Rank | 4392 |
| Score | 0 |
| Name | Geert-Jan JONKMAN |
| Country | Netherlands |
| Team | Elite without contract |
| Date | Race | Rank |
| 16/10 | Nationale Sluitingsprijs Putte-Kapellen | 49 |
Rider information for 2007
| Rank | 3300 |
| Score | 0 |
| Name | Geert-Jan JONKMAN |
| Country | Netherlands |
| Team | Ubbink - Syntec Cycling Team |
| Date | Race | Rank |
| 14/05 | Profronde van Fryslân | 90 |
| Delta Tour Zeeland | ||
| 13/06 | Prologue | 73 |
| 14/06 | Stage 2 | 57 |
Rider information for 2008
| Rank | 4308 |
| Score | 0 |
| Name | Geert-Jan JONKMAN |
| Country | Netherlands |
| Team | Elite without contract |
| Date | Race | Rank |
| Delta Tour Zeeland | ||
| 12/06 | Prologue | 131 |
| 13/06 | Stage 1 | 144 |
| 14/06 | Stage 2 | 88 |
| General Classification | 88 |
Rider information for 2009
| Rank | 3187 |
| Score | 1 |
| Name | Geert-Jan JONKMAN |
| Country | Netherlands |
| Team | Elite without contract |
| Date | Race | Rank |
| 09/05 | Omloop der Kempen | 130 |
Rider information for 2010
Rider Geert-Jan Jonkman is not classified in 2010.
| Date | Race | Rank |
| 23/04 | Arno Wallaard Memorial | 75 |
Rider information for 2011
| Rank | 5192 |
| Score | 0 |
| Name | Geert-Jan JONKMAN |
| Country | Netherlands |
| Team | Elite without contract |
| Date | Race | Rank |
| 06/05 | Circuit De Wallonie | 75 |
| 09/06 | Ronde van Zeeland Seaports | 24 |
| Ster ZLM Toer GP Jan van Heeswijk | ||
| 14/06 | Stage 1 | 151 |
| 15/06 | Stage 2 | 150 |
| 16/06 | Stage 3 | 78 |
| 17/06 | Stage 4 | 81 |
| General Classification | 133 | |
| 14/09 | Kampioenschap van Vlaanderen - Koolskamp | 26 |
| 23/09 | Gooikse Pijl | 116 |
Rider information for 2012
| Rank | 4317 |
| Score | 0 |
| Name | Geert-Jan JONKMAN |
| Country | Netherlands |
| Team | Koga Cycling Team |