source http://en.wikipedia.org/wiki/List_of_attendance_figures_at_domestic_professional_sports_leagues By average attendance top 20 Code: League Nation Sports Attendance 01 AFL Australia Aussie Rules 32,748 02 NPB Japan Baseball 25,626 03 Super League China Football 18,740 04 J-League 1 Japan Football 17,566 05 NRL Australia Rugby 17,346 06 KBO Korea Baseball 13,451 07 A-League Australia Football 12,556 08 Super League Indonesia Football 11,566 09 Premier League Iran Football 9,700 10 V-League Vietnam Football 7,298 11 K-League Korea Football 7,157 12 Super League Malaysia Football 6,914 13 Uzbek Leagie Uzbekistan Football 6,911 14 J-League 2 Japan Football 6,696 15 PBA Philippines Basketball 6,647 16 NBL Australia Basketball 5,397 17 Top League Japan Rugby 4,881 18 Premier League Thailand Football 4,572 19 League One China Football 4,306 20 CBA China Basketball 4,296 By total attendance top 20 Code: League Nation Sports Attendance 01 NPB Japan Baseball 21,679,596 02 KBO Korea Baseball 7,156,157 03 AFL Australia Aussie Rules 6,778,824 04 J-League 1 Japan Football 5,375,300 05 Super League China Football 4,497,578 06 NRL Australia Rugby 3,486,494 07 Premier League Iran Football 2,968,000 08 Super League Indonesia Football 2,428,930 09 K-League Korea Football 2,419,143 10 J-League 2 Japan Football 2,290,082 11 A-League Australia Football 1,632,321 12 Premier League Thailand Football 1,399,094 13 V-League Vietnam Football 1,328,000 14 CBA China Basketball 1,288,745 15 Uzbek League Uzbekistan Football 1,272,362 16 Super League Malaysia Football 1,258,348 17 KBL Korea Basketball 1,027,297 18 CPBL Taiwan Baseball 898,278 19 Saudi League Saudi Arabia Football 765,162 20 PBA Philippines Basketball 737,782
Interesting. J-League attendance has been slightly on the decline in recent years because stars move abroad.
I tought that baseball were becoming less popular in Japan and NPB attendances where failling down. J-league and J-league 2 have very good attendance counting the fact that they are separated leagues and have a lot of teams.