From Major League Baseball All-Star Game History by Baseball Almanac:
“…Through the years, every franchise has had its share of superstar players that stand out above the rest. They are the ones that bring the fans out to the ballpark and only one game brings them all together at once, The All-Star Game.
“The first Major League All-Star Game was played on July 6, 1933 at Comiskey Park in Chicago. It was initiated at the insistence of Arch Ward, a sports editor for the Chicago Tribune, to coincide with the celebration of Chicago's Century of Progress Exposition. For [90] years, the ‘Midsummer Classic’ has remained a fan favorite showcasing the top talent in baseball.
“All-Star teams were originally selected by the managers and the fans for the 1933 and 1934 games. From 1935 through 1946, managers selected the entire team for each league. From 1947 to 1957, fans chose the team's starters and the manager chose the pitchers and the remaining players. From 1958 through 1969, managers, players, and coaches made the All-Star Team selections. In 1970, the vote again returned to the fans for the selection of the starters for each team and remains there today.”
From data.census.gov:
Note: The image above is cropped at the bottom. Click on the image for the full page that includes sources.
Source: Population Division, 2022 Population Estimates.
Note: You may sort by column E (for MSAs) and by column I (for Population Estimate [as of July 1] 2022) to find the top 40 metro areas in the United States. Puerto Rico’s largest metro area is not in the top 40 and there is currently no major league baseball team in Puerto Rico.
Note: Click on the image for the full image PDF.
From QuickFacts: statistics for all states and counties, and for cities and towns with a population of 5,000 or more.
Note: After you create an account, select options for “Harmonized System” or “HS,” select “Exports” or Imports," type “Baseball” in the "Commodity" search box, then select options for geography and time. Select “Report” for data. More information can be found in the Quick Start Guide.