According to Official Guinness Records,
The widest tongue (female) measures 7.33 cm (2.89 in) at its widest point and belongs to Emily Schlenker (USA), as measured in Syracuse, New York, USA, on 2 November 2014.The record holder for the widest tongue (male) is Emily's dad Byron!
For a complete list of 2014 records, please visit 2014 Guinness Records in United States.