April 19, 1982|
|Height||5 ft 11 in (180 cm)|
|Weight||201 lb (91 kg; 14 st 5 lb)|
New York Rangers
Ak Bars Kazan
Torpedo Nizhny Novgorod
254th overall, 2002|
Toronto Maple Leafs
Immonen made his debut in Finland's second-tier league Mestis with TuTo Hockey during the 2000–01 season. For the following year, he joined Ässät of the country's top-tier Liiga. He then signed with fellow Liiga side JYP Jyväskylä in 2002 and remained three years at the club.
On March 3, 2004, Immonen was traded by the Maple Leafs to the New York Rangers as part of the Brian Leetch trade. He made his NHL debut for the Rangers during the 2005–06 season. In the course of his two-year stint with the Rangers, he played a total of 20 games in the NHL and mostly gained playing time in the American Hockey League (AHL) with the Hartford Wolf Pack. In his 141 AHL contests played, he scored 54 goals and had 75 assists.
He returned to Finland for the 2007-08 campaign, again joining JYP, where he spent another two years and won the Finnish championship in 2009, before signing with Ak Bars Kazan of the Kontinental Hockey League (KHL) shortly after. In his first year, he won the championship with Kazan. After four years with Ak Bars, Immonen decided to move on and join fellow KHL team Torpedo Nizhny Novgorod for the 2014–15 season.
On March 30, 2015, he agreed to a two-year contract with Swiss club, EV Zug of the NLA. At the conclusion of his contract with Zug, Immonen returned to Finland to play with his original club, JYP on a three-year contract from the 2017–18 season. 
On 14 April 2021, Immonen extended his professional career, leaving JYP as a free agent and signing a one-year contract with fellow Liiga club, Mikkelin Jukurit.
Immonen won the bronze medal with Finland at the 2010 Vancouver Winter Olympics. He won the gold medal with Finland at the 2011 IIHF World Championship, where he scored the most goals (9 in 9 games) and the most points (12) in the tournament. He was also named to the all-star lineup.
Regular season and playoffsEdit
|2005–06||Hartford Wolf Pack||AHL||74||30||40||70||34||6||2||3||5||2|
|2005–06||New York Rangers||NHL||6||2||0||2||0||—||—||—||—||—|
|2006–07||Hartford Wolf Pack||AHL||54||20||26||46||30||7||2||6||8||2|
|2006–07||New York Rangers||NHL||14||1||5||6||4||—||—||—||—||—|
|2009–10||Ak Bars Kazan||KHL||56||13||26||39||26||22||4||10||14||8|
|2010–11||Ak Bars Kazan||KHL||53||21||17||38||30||9||2||4||6||2|
|2011–12||Ak Bars Kazan||KHL||53||14||12||26||8||12||0||2||2||0|
|2012–13||Ak Bars Kazan||KHL||50||11||20||31||10||18||4||4||8||12|
|2013–14||Torpedo Nizhny Novgorod||KHL||54||14||24||38||18||7||3||1||4||2|
|2014–15||Torpedo Nizhny Novgorod||KHL||57||17||22||39||26||5||2||2||4||2|
|World Junior Championships|
|2002 Czech Republic|
- "Rangers trade Brian Leetch to Toronto". USA Today. March 3, 2004. Retrieved March 3, 2004.
- "TheAHL.com | The American Hockey League". theahl.com. Retrieved 2016-05-08.
- "Zug signs Finnish World Champion Jarkko Immonen for the next two seasons". swisshockeynews.ch. March 30, 2015. Retrieved March 30, 2015.
- "Jarkko Immonen has signed a three-year contract with JYP". swisshockeynews.ch. June 4, 2017. Retrieved June 5, 2017.
- "Jukurit sign veteran Jarkko Immonen" (in Finnish). Mikkelin Jukurit. 14 April 2021. Retrieved 14 April 2021.
- "Finland claim Bronze at Vancouver". National Hockey League. 2010-02-03. Retrieved 2010-02-03.
- Biographical information and career statistics from NHL.com, or Eliteprospects.com, or Eurohockey.com, or Hockey-Reference.com, or The Internet Hockey Database
- Jarkko Immonen on nhlfinns.com