Teams Jay O'Nien played for
| Minor Counties Championship | Hertfordshire (2012) |
| Minor Counties Trophy | Hertfordshire (2013) |
| Hertfordshire Premier League | Hemel Hempstead Town (2015) |
| Leicestershire Premier League | Kegworth Town (2013-2018) |
| Under-14 County Cup | Hertfordshire Under-14s (2007) |
| Under-15 County Cup | Hertfordshire Under-15s (2008) |
| Under-17 County Cup | Hertfordshire Under-17s (2010) |
| Under-17 County Championship | Hertfordshire Under-17s (2009-2010) |
| Miscellaneous | Hertfordshire Under-13s (2006) |
| Hertfordshire Under-15s (2008) | |
| Hemel Hempstead Town (2009-2015) | |
| Hertfordshire Under-17s (2010) | |
| Hertfordshire Development XI (2010-2013) | |
| Auburn (2011/12) | |
| Hertfordshire Academy (2012) | |
| Three Rivers Cricket Development Group (2012) | |
| British Universities (2012/13) | |
| Hertfordshire Second XI (2013) | |
| Hertfordshire (2013) | |
| Loughborough University (2013) | |
| Loughborough Marylebone Cricket Club University (2013) | |
| Hertfordshire Stags (2013) | |
| Kegworth Town (2013-2016) |
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