|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.
† Appearances (Goals).
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