From UC Berkeley School of Information, this page includes statistical graphics regarding the MLB, NFL, NBA, and NHL that answer the following questions: 
-What is the cost of a game?
-Which team is the best deal?
-What is the cost for fans?
-Which team is the most fun?

"Baseball Almanac is an interactive baseball encyclopedia filled with 500,000+ pages of in-depth baseball facts, original baseball research and baseball statistics."

Includes: 
-"Chart the Data" tool to chart and compare the NFL Football Operations statistics 
-"Weekly Dashboard" tool featuring a snapshot of the current NFL game statistics, updated weekly during the regular season.

ESPN provides statistics for various sports.

Select a league/sport to view relevant statistics

"A group of sites providing both basic and sabermetric statistics and resources for sports fans everywhere."

Sports contracts, salaries, caps, bonuses, and transactions.

by Munsey & Suppes
"Ballparks.com is a site that lists pictures, facts and histories of the places professional and amateur sports teams play baseball, basketball, football, hockey, the olympics and soccer. The list of sports facilities is not limited to just each team's present stadium, but also shows the same information about their former and future facilities."

Covers past, present, and future Major League Baseball parks.

From Russell Scibetti with The Business of Sports, this interactive dashboard uses Homeland Infrastructure Foundation-Level Data (HIFLD). available via the U.S. Department of Homeland Security, to create visualizations including:
-number of venues per category and usage by state and city
-average, largest and smallest capacities across Horse Racing, IRL, MILB, MLB, MLS, NASCAR, NBA, NCAA, NFL, NHL and WNBA (note: PGA venues do not have capacity data)

Includes detailed locations, sizes and web links for 800+ venues. (Note: does not include every currently operational property.)

Online newsletter from National Sports Law Institute at Marquette University Law School.
"The Sports Facility Reports 'SFR' online newsletter was created in 2000 to provide interested individuals within the sports industry with information about teams, sports facilities, the development of new facilities, revenue streams, lease agreements, and other reference information related to sports facility. "

Past, present, and future NFL stadium details, comparisons, news, and more.