[2][3] On 9 November 2019, O'Hanlon claimed a County Junior Championship title when he captained Kilshannig to a 0–22 to 0–11 defeat of St. James's in the final.
[7] After lining out in several games during the successful pre-season McGrath Cup campaign, O'Hanlon was added to the Cork senior panel for the 2016 National League.
After two further but unsuccessful seasons with the Cork junior team, O'Hanlon made his senior championship debut on 7 July 2018 when he came on as a substitute for Jamie O'Sullivan in a 3–20 to 0–13 defeat by Tyrone in a Round 4 Qualifier.
[10] The disrupted 2020 National League saw O'Hanlon claim further silverware when Cork secured the Division 3 title after remaining undefeated for the entire campaign.
[11] He and Aidan Browne sustained cruciate injuries in separate incidents when training resumed ahead of the delayed 2021 season.