All available race results Jaak Demeyer
| Date | Race | Rank |
| 28/07 | Scheldeprijs - Schoten | 10 |
Rider information for 1936
| Rank | 1556 |
| Score | 0 |
| Name | Jaak DEMEYER |
| Country | Belgium |
| Team | Individual |
No results available in season 1937.
Rider information for 1937
| Rank | 1226 |
| Score | 0 |
| Name | Jaak DEMEYER |
| Country | Belgium |
| Team | Individual |
| Date | Race | Rank |
| Tour de Belgique | ||
| 18/05 | Stage 1 | 15 |
| 19/05 | Stage 2 | 80 |
| 20/05 | Stage 3 | 59 |
| 02/08 | Scheldeprijs - Schoten | 10 |
Rider information for 1938
| Rank | 998 |
| Score | 5 |
| Name | Jaak DEMEYER |
| Country | Belgium |
| Team | Individual |
No results available in season 1939.
Rider information for 1939
| Rank | 1016 |
| Score | 5 |
| Name | Jaak DEMEYER |
| Country | Belgium |
| Team | Individual |
| Date | Race | Rank |
| 31/03 | Ronde van Vlaanderen | 34 |
Rider information for 1940
| Rank | 315 |
| Score | 22 |
| Name | Jaak DEMEYER |
| Country | Belgium |
| Team | Individual |