To my knowledge and research, these are the 2019 50,000 watt Class A stations carrying major league baseball in English this year. There are other 50,000 watt stations but they are class B stations. Please free feel to add and/or correct. All are flagships unless noted. Affiliates may carry alternative programming at times (Montreal Hockey/Soccer). The Mets switched to a better Class A station.
660am WFAN New York Yankees
670am WSCR Chicago Cubs
680am KNBR San Francisco Giants
690am CKGM Toronto Blue Jays Affiliate in Montreal, Quebec in English
700am WLW Cincinnati Reds
710am KIRO Seattle Mariners
720am WGN Chicago White Sox
830am WCCO Minnesota Twins
850am KOA Colorado Rockies
880am WCBS New York Mets
1080am WTIC Boston Red Sox Affiliate in Hartford, CT
1080am KRLD Texas Rangers - Broadcasts when there are conflicts for KRLD-FM Flagship
1100am WTAM Cleveland Indians
1120am KMOX Saint Louis Cardinals
1140am WRVA Washington Nationals. Affiliate in Richmond, VA
1500am WFED Washington Nationals