They are ordered by their seating capacity, that is the maximum number of spectators that the stadium can accommodate in seated areas.
Football stadiums with a capacity of 40,000 or more are included.
That is the minimum capacity required for a stadium to host FIFA World Cup finals matches.
Note that most sports venues with a capacity of at least 40,000 are used for association football.
Some stadiums are only used by a team for certain high attendance matches, like local derbies or cup games.