|Date of birth||29 October 1980|
|Place of birth||Derry, Northern Ireland|
|Height||5 ft 10 in (1.78 m)|
|Crystal Palace Baltimore|
|2002||Cape Cod Crusaders|
|2007–||Crystal Palace Baltimore||48||(1)|
|2003–2005||Mount St. Mary's University|
|2009||Loyola University Maryland|
* Senior club appearances and goals counted for the domestic league only and correct as of 11 October 2009.
College and amateur
Harkin played college soccer at Fairfield University in Fairfield, Connecticut from 1999-2002. In 2000, he set the Stags' single season assist record with 9 while helping lead the team to a No. 15 national ranking, and in 2002 he was selected as a Regional All-American by the NSCAA.
Harkin signed for Crystal Palace Baltimore prior to the team's inaugural season in 2007, and has been ever-present since then, making 50 appearances for the club in USL Second Division and U.S. Open Cup play, and helping the team to the post-season playoffs in 2008.
- (correct as of 4 March 2010)
|Crystal Palace Baltimore||2007||16||1||1||1||0||0||-||-||-||17||1||1|
|Crystal Palace Baltimore||2008||18||0||2||4||0||1||2||0||0||24||0||3|
|Crystal Palace Baltimore||2009||14||0||0||0||0||0||0||0||0||14||0||0|
- "Harkin To Serve As Men's Soccer Volunteer Assistant Coach". Loyola Athletics. Retrieved 2009-08-24.
- Includes Lamar Hunt US Open Cup