Non-major league data on Baseball Reference can be found in the Register section of the site:

The Register homepage can be accessed via the links in the footer of any page.

From there are many ways to access the non-major league data. For example, the "Years" dropdown menus on that page can be used to access summary pages for the organized minors or for all non-major leagues in a given year.

Here is an example link to the summary page for every 2025 competition in the database.

The Register home page also features links to minor league affiliates by year and by major league team.

The links below are examples of these pages showing every affiliate in a given season and every affiliate in a particular franchise's history:

There are also links to every league covered in the database:

And every team in the database, sorted by location. 

By clicking on the locations you can see a list of all seasons in our database played by teams in that city:

There are dedicated home pages for Japanese Baseball, Black Baseball (covering teams and leagues that were not part of the major Negro Leagues), Korean Baseball, Cuban Baseball, College Baseball and the World Baseball Classic.

The Player Index allows you to look for players in the database by last name:

Finally, the leaderboard pages allow you to search for minor league, college, or all leaders for given stats in a particular season:

When on any Register page on the site, the menu on the left hand side of the screen can be used to return the Register home page, and also includes links to the player, team, league and affiliate indexes.