Question: What county is Princeton Stadium located in?

Context paragraphs:
2003 Princeton Tigers football team: The 2003 Princeton Tigers football team represented Princeton University in the 2003 NCAA Division I-AA football season.  The team was coached by Roger Hughes and played their home games at Princeton Stadium in Princeton, New Jersey.  They were members of the Ivy League.

2005 Princeton Tigers football team: The 2005 Princeton Tigers football team represented Princeton University in the 2005 NCAA Division I FCS football season.  The team was coached by Roger Hughes and played their home games at Princeton Stadium in Princeton, New Jersey.  They were members of the Ivy League.

2004 Princeton Tigers football team: The 2004 Princeton Tigers football team represented Princeton University in the 2004 NCAA Division I-AA football season.  The team was coached by Roger Hughes and played their home games at Princeton Stadium in Princeton, New Jersey.  They were members of the Ivy League.

2009 Princeton Tigers football team: The 2009 Princeton Tigers football team represented Princeton University in the 2009 NCAA Division I FCS football season.  The team was coached by Roger Hughes and played their home games at Princeton Stadium in Princeton, New Jersey.  They were members of the Ivy League.

2007 Princeton Tigers football team: The 2007 Princeton Tigers football team represented Princeton University in the 2007 NCAA Division I FCS football season.  The team was coached by Roger Hughes and played their home games at Princeton Stadium in Princeton, New Jersey.  They were members of the Ivy League.

2006 Princeton Tigers football team: The 2006 Princeton Tigers football team represented Princeton University in the 2006 NCAA Division I FCS football season.  The team was coached by Roger Hughes and played their home games at Princeton Stadium in Princeton, New Jersey.  They were members of the Ivy League.

2000 Princeton Tigers football team: The 2000 Princeton Tigers football team represented Princeton University in the 2000 NCAA Division I-AA football season.  In their first year under head coach Roger Hughes, the team compiled a 3–7 record (3–4 against Ivy League opponents) and finished in fifth place in the Ivy League.  The team played its home games at Princeton Stadium in Princeton, New Jersey.

2002 Princeton Tigers football team: The 2002 Princeton Tigers football team represented Princeton University in the 2002 NCAA Division I-AA football season.  The team was coached by Roger Hughes and played their home games at Princeton Stadium in Princeton, New Jersey.  They were members of the Ivy League.

2001 Princeton Tigers football team: The 2001 Princeton Tigers football team represented Princeton University in the 2001 NCAA Division I-AA football season.  The team was coached by Roger Hughes and played their home games at Princeton Stadium in Princeton, New Jersey.  They were members of the Ivy League.

Princeton, New Jersey: Princeton is a municipality with a borough form of government in Mercer County, New Jersey, United States, that was established in its current form on January 1, 2013, through the consolidation of the Borough of Princeton and Princeton Township.  As of the 2010 United States Census, the municipality's population was 28,572, reflecting the former township's population of 16,265, along with the 12,307 in the former borough.

Supporting paragraphs: 2005 Princeton Tigers football team Princeton, New Jersey
Answer: Mercer County