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In order to conserve the limited bandwidth available .iso images are not downloadable from mirror.centos.org

The following mirrors should have the ISO images available:

http://mirrors.usinternet.com/centos/6.6/isos/x86_64/
http://mirror.trouble-free.net/centos/6.6/isos/x86_64/
http://mirrors.centos.webair.com/centos/6.6/isos/x86_64/
http://mirror.pac-12.org/6.6/isos/x86_64/
http://mirror.oss.ou.edu/centos/6.6/isos/x86_64/
http://repo.dimenoc.com/pub/centos/6.6/isos/x86_64/
http://repo.atlantic.net/centos/6.6/isos/x86_64/
http://centos.mirrors.tds.net/pub/linux/centos/6.6/isos/x86_64/
http://mirror.teklinks.com/centos/6.6/isos/x86_64/
ftp://ftp.uci.edu/mirrors/centos/6.6/isos/x86_64/
http://centos.unixheads.org/6.6/isos/x86_64/
http://mirror.tocici.com/centos/6.6/isos/x86_64/
http://mirror.evolvedservers.com/CentOS/6.6/isos/x86_64/
http://mirrors.cat.pdx.edu/centos/6.6/isos/x86_64/
http://centos.chi.host-engine.com/6.6/isos/x86_64/
http://mirror.beyondhosting.net/CentOS/6.6/isos/x86_64/
http://mirror.atlanticmetro.net/centos/6.6/isos/x86_64/
http://centos.mirrors.wvstateu.edu/6.6/isos/x86_64/
http://mirror.tzulo.com/centos/6.6/isos/x86_64/
http://mirror-centos.hostingswift.com/centos/6.6/isos/x86_64/
http://mirror.team-cymru.org/CentOS/6.6/isos/x86_64/
http://repos.dfw.quadranet.com/centos/6.6/isos/x86_64/
http://mirror.dattobackup.com/CentOS/6.6/isos/x86_64/
http://centos.eecs.wsu.edu/6.6/isos/x86_64/
http://mirrors.gigenet.com/centos/6.6/isos/x86_64/
http://mirror.umd.edu/centos/6.6/isos/x86_64/
http://ftp.usf.edu/pub/centos/6.6/isos/x86_64/
http://mirror.vtti.vt.edu/centos/6.6/isos/x86_64/
http://mirrors.mit.edu/centos/6.6/isos/x86_64/
http://mirror.thelinuxfix.com/CentOS/6.6/isos/x86_64/
ftp://ftp.wallawalla.edu/pub/mirrors/centos/6.6/isos/x86_64/
http://mirrors.kernel.org/centos/6.6/isos/x86_64/
http://mirror.vcu.edu/pub/gnu+linux/centos/6.6/isos/x86_64/
http://repos.redrockhost.com/centos/6.6/isos/x86_64/
http://bay.uchicago.edu/centos/6.6/isos/x86_64/
http://mirror.spro.net/centos/6.6/isos/x86_64/
http://mirrors.advancedhosters.com/centos/6.6/isos/x86_64/
http://mirror.ancl.hawaii.edu/linux/centos/6.6/isos/x86_64/
http://mirrors.xmission.com/centos/6.6/isos/x86_64/
http://mirror.solarvps.com/centos/6.6/isos/x86_64/
http://mirror.cc.columbia.edu/pub/linux/centos/6.6/isos/x86_64/
http://mirror.5ninesolutions.com/centos/6.6/isos/x86_64/
http://ftp.osuosl.org/pub/centos/6.6/isos/x86_64/
http://mirror.es.its.nyu.edu/centos/6.6/isos/x86_64/
http://centos.sonn.com/6.6/isos/x86_64/
http://mirror.metrocast.net/centos/6.6/isos/x86_64/
http://mirror.cogentco.com/pub/linux/centos/6.6/isos/x86_64/
http://linux.mirrors.es.net/centos/6.6/isos/x86_64/
http://linux.cc.lehigh.edu/centos/6.6/isos/x86_64/
http://mirror.1stclasshosting.com/centos/6.6/isos/x86_64/

Mirrors Verified Tue Jul 28 10:06:57 2015 UTC

Or use bittorrent to download the .torrent files provided.

Bittorrent is a peer to peer download system described at http://bittorrent.com/ and there are many clients available.

These include (in no particular order of preference): utorrent, vuze (Azureus), BitTorrent, Deluge, ctorrent, ktorrent, rtorrent and transmission.

Packaged copies of various torrent clients for CentOS can be found in the repositories listed in the following wiki article : http://wiki.centos.org/AdditionalResources/Repositories