Methodology — The Ballpark Index

Source: KBO official attendance records (KBO 관중 현황) — the league’s own attendance records, published on the official KBO site. Season 2026, snapshot as of 2026년 08월 27일. Retrieved 2026-08-29.
How the ranking works: Cumulative home attendance divided by home games played (569 league games so far). Per-game average is the fair mid-season measure — clubs do not play the same number of home dates at any given moment.
Update cadence: The league updates after each game day; we refresh the snapshot periodically during the season and label the as-of date.

Limits worth knowing before you cite this

Average attendance is half stadium size. A club that sells out a 12,000-seat park cannot out-rank a half-full 23,000-seat one. This ranks crowds, not passion per seat.
A mid-season snapshot moves. Pennant races and weather shift late-season crowds; the final order can differ from today’s.
Attendance is tickets through the gate, as counted by the league — promotions and comp tickets are in the number.