Yankee Stadium - 49,642
http://newyork.yankees.mlb.com/news/print.jsp?ymd=20140421&content_id=72869532&vkey=news_nyy&c_id=nyy
http://www.nytimes.com/2014/04/22/sports/soccer/yankee-stadium-will-close-deck.html

Angel Stadium - 45,050
http://losangeles.angels.mlb.com/ana/ballpark/ballpark_history.jsp
http://losangeles.angels.mlb.com/ana/history/ballparks.jsp

Fenway Park - 37,493 (night) or 37,065 (day)
http://boston.redsox.mlb.com/bos/ballpark/information/index.jsp?content=facts

Comerica Park - 41,681
http://www.metrotimes.com/detroit/detroit-tigers-by-the-numbers/Content?oid=2144381

Globe Life Park - 48,114
http://texas.rangers.mlb.com/tex/ballpark/information/index.jsp?content=facts_figures

Camden Yards - 45,971
http://www.nytimes.com/2012/04/10/sports/baseball/oriole-park-at-camden-yards-keeps-up-with-the-times-at-age-20.html
http://www.delawarenorth.com/Sportservice-Partners-Camden-Yards.aspx

Rogers Centre - 48,292
http://www.rogerscentre.com/about/facts.jsp

Target Field - 39,504
http://minnesota.twins.mlb.com/min/ballpark/ballpark_features.jsp
 (Although "about 39,200" - http://www.startribune.com/sports/twins/172754791.html)

Safeco Field - 47,116
http://seattle.mariners.mlb.com/sea/history/ballparks.jsp
http://seattle.mariners.mlb.com/sea/ballpark/information/index.jsp?content=groundrules

O.co Coliseum - 35,067
http://oakland.athletics.mlb.com/oak/ballpark/information/index.jsp?content=guide
http://oakland.athletics.mlb.com/oak/history/ballparks.jsp

Kauffman Stadium - 37,903
http://kansascity.royals.mlb.com/kc/ballpark/information/index.jsp?content=moreinfo

Minute Maid Park - 40,963
http://houston.astros.mlb.com/hou/ballpark/information/index.jsp?content=facts_figures

U.S. Cellular Field - 40,615
http://www.usatoday.com/story/sports/mlb/whitesox/2013/05/17/us-cellular-field-made-right-call-on-rehab/2210221/
http://www.isfauthority.com/u.s.-cellular-field.html

Progressive Field - 43,545
http://www.cleveland.com/tribe/index.ssf/2013/09/indians_wild_card_game_at_prog.html
http://www.progressive.com/progressive-insurance/about-progressive-field/

Tropicana Field - 31,042
http://tampabay.rays.mlb.com/tb/ballpark/rays_360.jsp
http://sports.yahoo.com/news/price-outpitches-dickey-rays-top-232522829--mlb.html


Dodger Stadium - 56,000
http://articles.latimes.com/2013/aug/10/sports/la-sp-0811-dodgers-notes-20130811

Busch Stadium - 46,861
http://www.stltoday.com/sports/baseball/professional/rooftop-seats-give-cards-shot-at-attendance-marks/article_db2e869a-25db-5fd8-9546-e310a82aaefd.html

AT&T Park - 41,503
http://sanfrancisco.giants.mlb.com/sf/ballpark/information/index.jsp?content=history

Miller Park - 43,000
http://milwaukee.brewers.mlb.com/mil/history/ballparks.jsp
http://www.cbsnews.com/news/miller-park-beer-bratwurst-brewer-baseball-history/

Coors Field - 50,398
http://www.denverpost.com/rockies/ci_25479735/rockies-rooftop-party-deck-another-dimension-coors-field
http://www.denverpost.com/rockiesmailbag/ci_25608047/rockies-mailbag-why-is-there-no-talk-extending

Wrigley Field - 41,160
http://cubs.mlb.com/chc/ballpark/information/index.jsp?content=history
http://www.nytimes.com/2014/04/21/sports/baseball/oh-the-stories-wrigley-field-could-tell.html

Nationals Park - 41,546
http://washington.nationals.mlb.com/was/ballpark/information/index.jsp?content=facts_figures
http://www.chicagotribune.com/sports/hockey/blackhawks/chi-winter-classic-nationals-park-20140910-story.html
 (some more attendance data at http://www.masnsports.com/nationals-pastime/2012/05/over-capacity-with-room-to-spare.html -and- http://www.tbd.com/articles/2011/03/dozens-of-seats-removed-from-nationals-park-56566.html)

Great American Ball Park - 42,271
http://cincinnati.reds.mlb.com/cin/ballpark/information/index.jsp?content=facts

PNC Park - 38,362
http://pittsburgh.pirates.mlb.com/pit/ballpark/information/index.jsp?content=facts

Citizens Bank Park - 43,651
http://philadelphia.phillies.mlb.com/phi/ballpark/information/index.jsp?content=facts_figures

Turner Field - 49,586
http://www.cbs46.com/category/278481/atlanta-braves
http://www.athleticbusiness.com/more-news/braves-appeal-lawsuit-involving-2010-foul-ball-injury.html
http://www.ocregister.com/articles/tickets-529652-games-game.html

Petco Park - 42,445
http://sandiego.padres.mlb.com/sd/ballpark/history.jsp
http://about.petco.com/wp-content/uploads/2014/08/11-03646_PetcoCompanyFactSheets_PetcoPark_8-27-14.pdf

Citi Field - 41,922
http://newyork.mets.mlb.com/nym/ballpark/information/index.jsp?content=by_the_numbers

Chase Field - 48,633
http://arizona.diamondbacks.mlb.com/ari/ballpark/information/index.jsp?content=chase_history

Marlins Park - 37,442
http://miami.marlins.mlb.com/mia/ballpark/marlins_park_parking.jsp
http://miami.marlins.mlb.com/mia/history/ballparks.jsp
http://marlinsballpark.mlblogs.com/2013/12/16/come-and-discover-marlins-park-today/