Updated through this weekend - Nats Park top 10 attendances of all time including post-season:
45,966 Friday 12th October 2012 vs Cardinals [NLDS Game 5]
45,274 Monday 1st April 2013 vs Marlins [season/home opener]
45,017 Wednesday 10th October 2012 vs Cardinals [NLDS Game 3]
44,685 Saturday 20th August 2011 vs Phillies [highest of 2011]
44,392 Thursday 11th October 2012 vs Cardinals [NLDS Game 4]
42,834 Friday 4th April 2014 vs Braves [home opener]
42,662 Saturday 18th August 2012 vs Mets [highest of 2012 regular season]
42,331 Saturday 19th May 2012 vs Orioles
41,992 Saturday 13th April 2013 vs Braves [highest non-opener April turnout ever]
41,985 Thursday 25th June 2009 vs Red Sox [highest of 2009]
Top 10 attendances, regular season only:
45,274 Monday 1st April 2013 vs Marlins [season/home opener]
44,685 Saturday 20th August 2011 vs Phillies [highest of 2011]
42,834 Friday 4th April 2014 vs Braves [home opener]
42,662 Saturday 18th August 2012 vs Mets [highest of 2012 regular season]
42,331 Saturday 19th May 2012 vs Orioles
41,992 Saturday 13th April 2013 vs Braves [highest non-opener April turnout ever]
41,985 Thursday 25th June 2009 vs Red Sox [highest of 2009]
41,918 Sunday 20th May 2012 vs Orioles
41,816 Saturday 20th July 2013 vs Dodgers
41,727 Sunday 21st August 2011 vs Phillies