US Shonen Jump, January 2011, in shelves now! 
The Japanese Magazine Publishers Association showed today the latest chart pertaining to the top circulating manga magazines, taking the period between October 1, 2009 and September 30, 2010.

Weekly Shonen Jump by Shueisha definitely came on top with 2,876,459 million of readers, followed closely by Kodansha's Weekly Shonen Magazine with 1,571,063, losing quite a bit from last year.

Coro Coro Comic Shogakukan 950,834

Monthly Shonen Magazine Kodansha 847,250

Weekly Shonen Sunday Shogakukan 678,917

Weekly Shonen Champion Akita Shoten 500,000

Jump Square magazine by Shueisha remains with a respectable 360,000, despite having great cult mangas such as Ultimo and Ao no exorcist.

In seinen mangas, Young Magazine by Kodansha is the absolute leader with 807,871

And Ciao mangazine by Shogakukan is the leader in shojo manga with 745,455 of estimated readers.