| Competition: | Finnish League Division 1 |
| Season: | 2004 |
| Prevseason: | 2003 |
| Nextseason: | 2005 |
League tables for teams participating in Ykkönen, the second tier of the Finnish Soccer League system, in 2004.
Jazz Pori as 13th placed team in the 2004 Veikkausliiga and MIFK Mariehamn as runners-up of the 2004 Ykkönen competed in a two-legged play-off for a place in the Veikkausliiga. MIFK won the play-offs 3-2 on aggregate and were promoted to the Veikkausliiga.
MIFK Mariehamn - Jazz Pori 1-0
Jazz Pori - MIFK Mariehamn 2-2[1]
OLS Oulu - VG-62 Naantali 0-1
VG-62 Naantali - OLS Oulu 3-1
KPV Kokkola - Kraft Närpes 1-1
Kraft Närpes - KPV Kokkola 1-1 aet., 1-4 pen.[2]
KPV Kokkola (formerly also KPV-J Kokkola) were promoted to the Ykkönen and Kraft Närpes relegated to the Kakkonen. KPV Kokkola won 4-1 on penalties.
VG-62 Naantali remained in the Ykkönen after beating OLS Oulu 4-1 on aggregate.