I have visited the following stadiums:
 
NAME OF BALLPARK
CITY
STATE
Alexian Field Schaumburg Illinois
All Pro Freight Stadium Avon Ohio
Alliance Bank Stadium Syracuse

New York
Amerige Park Fullerton California
*Angel Stadium at Anaheim Anaheim California
Angel Stadium Palm Springs California
Arrowhead Credit Union Park San Bernardino California
Baxter Stadium Mountaindale New York
BB&T Coastal Federal Field Myrtle Beach South Carolina
The Ballpark at Harbor Yard Bridgeport Connecticut
Bears & Eagles Riverfront Stadium Newark New Jersey
Beehive Field New Britain Connecticut
Bicentennial Park Allentown Pennsylvania
Bernie Robbins Stadium Atlantic City New Jersey
Beyer Stadium Rockford Illinois
Blair County Ballpark Altoona Pennsylvania
Blair Field Long Beach California
Bowman Field Williamsport Pennsylvania
Brennan Field Romeoville Illinois
*Busch Stadium St. Louis Missouri
Campbell's Field Camden New Jersey
Canal Park Akron Ohio
Champion Window Field Florence Kentucky
*Citi Field Flushing New York
Clear Channel Stadium Lancaster California
Clipper Magazine Stadium Lancaster Pennsylvania
*Citizens Bank Park Philadelphia
Pennsylvania
Classic Park Eastlake Ohio
C.O. Brown Stadium Battle Creek Michigan
Coca-Cola Park Allentown Pennsylvania
Commerce Bank Ballpark Harrisburg Pennsylvania
* Commerica Park Detroit Michigan
* Comiskey Park Chicago Illinois
Consol Energy Park Washington Pennsylvania
Cooper Stadium Columbus Ohio
County Stadium Milwaukee Wisconsin
Damaschke Field Oneonta New York
Delano-Hitch Stadium Newburgh New York
Dietz Memorial Stadium Kingston New York
Dodd Stadium Norwich Connecticut
*Dodger Stadium Los Angeles California
Doubleday Field Cooperstown New York
Doug Fritz Field Mission Viejo California
Dunn Tire Park Buffalo New York
Dutchess Stadium Fishkill New York
Dwyer Stadium Batavia New York
Eastwood Field Niles Ohio
E.J. Block Athletic Field East Chicago Indiana
The Epicenter Rancho Cucamonga California
Falcon Park Auburn New York
* Fenway Park Boston Massachusetts
Fifth Third Field Dayton Ohio
Fifth Third Field Toledo ohio
First Energy Park Lakewood New Jersey
First Energy Stadium Reading Pennsylvania
Fiscalini Field San Bernardino California
Flaherty Field New Castle Pennsylvania
Frawley Stadium Wilmington Delaware
Goodwin Field Fullerton California
Frontier Field Rochester New York
* Great American Ballpark Cincinnati Ohio
Greer Stadium Nashville Tennessee
Hammons Field Springfield Missouri
Hanover Insurance Park at Fitton Field Worcester Massachusetts
Harbor Park Norfolk Virginia
Harry Grove Stadium Frederick Maryland
Harry C. Pohler Field Beloit Wisconsin
Heritage Park Colonie New York
Homer Stryker Field Kalamazoo Michigan
Howard J. Lamade Stadium Williamsport Pennsylvania
Howie Minas Field Midlothian Illinois
Huntington Park Columbus Ohio
Jack Critchfield Park Slippery Rock Pennsylvania
Jay Littleton Ballpark Ontario California
Joseph Bruno Stadium Troy New York
* Kauffman Stadium Kansas City Missouri
KeySpan Park Brooklyn New York
Lake Elsinore Diamond Lake Elsinore California
La Palma Park Anaheim California
Lane Field San Diego California
Marinelli Field Rockford Illinois
McCarthy Field West Warwick Rhode Island
McCoy Stadium Pawtucket Rhode Island
Medlar Field at Lubrano Park State College Pennsylvania
Mercer County Waterfront Park Trenton New Jersey
Merchantsauto.com Stadium Manchester New Hampshire
*Miller Park Milwaukee Wisconsin
Municipal Stadium Waterbury Connecticut
Muzzy Field Bristol Connecticut
*Nationals Park Washington District of Columbia
New Britain Stadium New Britain Connecticut
NYSEG Stadium Binghamton New York
O'Brien Field Peoria Illinois
Oestrike Stadium Ypsilanti Michigan
* Oriole Park at Camden Yards Baltimore Maryland
Perdue Stadium Salisbury Maryland
* Petco Park San Diego California
Philip B. Elfstrom Stadium Geneva Illinois
The Pipe Yard Lorain Ohio
PNC Field Scranton Pennsylvania
* PNC Park Pittsburgh Pennsylvania
Pohlman Field Beloit Wisconsin
Pringles Park Jackson Tennessee
* Progressive Field Cleveland Ohio
Pullman Park Butler Pennsylvania
Quigley Stadium West Haven Connecticut
Regency Furniture Stadium Waldorf Maryland
Richmond County Bank Ballpark Staten Island New York
Ripken Stadium Aberdeen Maryland
Riverside Sports Complex Riverside California
Road Ranger Stadium Loves Park Illinois
Rock County 4H Fair Janesville Wisconsin
* Rogers Centre Toronto Ontario
* Qualcomm Stadium San Diego California
Sam Lynn Ballpark Bakersfield California
* Shea Stadium Flushing New York
Shipley Field College Park Maryland
Silver Cross Field Joliet Illinois
Simmons Field Kenosha Wisconsin
Skylands Park Augusta New Jersey
Stater Brothers Stadium Adelanto California
Standard Bank Stadium Crestwood Illinois
Stanley Coveleski Regional Stadium South Bend Indiana
Sovereign Bank Stadium York Pennsylvania
Steinbrenner Field Tampa Florida
TD Bank Ballpark Bridgewater New Jersey
*Tiger Stadium Detroit Michigan
Tony Gwynn Stadium San Diego California
* Tropicana Field St. Petersburg Florida
* US Cellular Field Chicago Illinois
US Steel Yard Gary Indiana
* Veteran's Stadium Philadelphia Pennsylvania
Wahconah Park Pittsfield Massachusetts
* Wrigley Field Chicago Illinois
Yale Field West Haven Connecticut
* Yankee Stadium Bronx New York
* Yankee Stadium (new) Bronx New York
Yogi Berra Stadium Little Falls New Jersey
     
TOTAL   137

* MLB Stadium