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| Black-headed Gull | ||
Click on the Date to open the record |
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| Year | County | Accepted |
| 1988 | ERIE | No |
| 1989 | ERIE | No |
| 1990 | ERIE | No |
| 1992 | LANCASTER | No |
| 1992 | ERIE | No |
| 1992 | LANCASTER | No |
| 1993 | CHESTER | No |
| 1997 | BUCKS | No |
| 1997 | ALLEGHENY | No |
| 1998 | BUTLER | No |
| 1999 | ERIE | No |
| 1999 | CARBON | No |
| 1999 | ALLEGHENY | No |
| 2000 | ERIE | No |
| 2000 | ERIE | No |
| 2000 | DAUPHIN | No |
| 2000 | ALLEGHENY | No |
| 2004 | BUCKS | No |
| 2005 | DAUPHIN | No |
| 2006 | LANCASTER | No |
| 2007 | BUCKS | No |
| 2007 | DAUPHIN | No |
| 2008 | DAUPHIN | No |
| 2008 | BUTLER | No |
| 2009 | NORTHAMPTON | No |
| 2010 | PERRY/DAUPHIN | No |
| 2010 | CUMBERLAND | No |
| 2010 | BUCKS | No |
| 2011 | DAUPHIN | No |
| 2011 | BUTLER | No |
| 2012 | LANCASTER | No |
| 2012 | BUTLER | No |
| 2013 | ERIE | No |
| 2014 | PHILADELPHIA | No |
| 2014 | BUTLER | No |
| 2016 | PHILADELPHIA | No |
| 2016 | BUCKS | No |
| 2017 | BUCKS | No |
| 2017 | BUCKS | No |
| 2017 | BUTLER | No |
| 2018 | BUCKS | No |
| 2020 | PHILADELPHIA | Yes |
| 2021 | ERIE | No |