McCormack has featured for Boston Renegades, Vancouver Whitecaps Women and Ottawa Fury in the W-League. She also played for Fortuna Hjørring in Denmark. Since moving to Norway in 2008, McCormack has represented Toppserien clubs Asker Fotball, FK Larvik and Kolbotn Fotball. She left Kolbotn for Donn Toppfotball in August 2010. Ciara now coaches club teams in California, USA
However, McCormack first appeared for the Republic of Ireland in three friendly games against the United States in September 2008. She then played in both defence and midfield for Ireland. McCormack's father Barry is from Athlone and her mother is from County Cork.