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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://centos.mbni.med.umich.edu/mirror/6.6/isos/i386/
http://mirror.cisp.com/CentOS/6.6/isos/i386/
http://centos-mirror.jchost.net/6.6/isos/i386/
http://mirror.nexcess.net/CentOS/6.6/isos/i386/
http://mirror.evolvedservers.com/CentOS/6.6/isos/i386/
http://centos.corenetworks.net/6.6/isos/i386/
http://repos.redrockhost.com/centos/6.6/isos/i386/
http://mirror.clarkson.edu/centos/6.6/isos/i386/
http://repos.mia.quadranet.com/centos/6.6/isos/i386/
http://dist1.800hosting.com/centos/6.6/isos/i386/
http://mirrors.syringanetworks.net/centos/6.6/isos/i386/
http://mirror.ancl.hawaii.edu/linux/centos/6.6/isos/i386/
http://mirrors.tummy.com/mirrors/CentOS/6.6/isos/i386/
http://mirror.es.its.nyu.edu/centos/6.6/isos/i386/
ftp://ftp.ussg.iu.edu/linux/centos/6.6/isos/i386/
http://mirror.teklinks.com/centos/6.6/isos/i386/
http://ftpmirror.your.org/pub/centos/6.6/isos/i386/
http://mirror.umd.edu/centos/6.6/isos/i386/
http://centos.chi.host-engine.com/6.6/isos/i386/
http://linux.cc.lehigh.edu/centos/6.6/isos/i386/
http://mirror.metrocast.net/centos/6.6/isos/i386/
http://www.gtlib.gatech.edu/pub/centos/6.6/isos/i386/
http://mirrors.tripadvisor.com/centos/6.6/isos/i386/
http://centos.sonn.com/6.6/isos/i386/
http://mirror.steadfast.net/centos/6.6/isos/i386/
http://mirrors.usc.edu/pub/linux/distributions/centos/6.6/isos/i386/
http://mirror.acsnet.com/centos/6.6/isos/i386/
http://mirror.ash.fastserv.com/pub/linux/centos/6.6/isos/i386/
http://mirror.cc.columbia.edu/pub/linux/centos/6.6/isos/i386/
http://mirror.supremebytes.com/centos/6.6/isos/i386/
http://mirror.keystealth.org/centos/6.6/isos/i386/
http://mirror.oss.ou.edu/centos/6.6/isos/i386/
http://mirror.san.fastserv.com/pub/linux/centos/6.6/isos/i386/
http://mirror.sanctuaryhost.com/centos/6.6/isos/i386/
http://bay.uchicago.edu/centos/6.6/isos/i386/
http://mirror-centos.hostingswift.com/centos/6.6/isos/i386/
http://mirrors.adams.net/centos/6.6/isos/i386/
http://mirrors.liquidweb.com/CentOS/6.6/isos/i386/
http://mirrors.lga7.us.voxel.net/centos/6.6/isos/i386/
http://mirrors.psychz.net/Centos/6.6/isos/i386/
http://repo.dimenoc.com/pub/centos/6.6/isos/i386/
http://mirror.fdcservers.net/centos/6.6/isos/i386/
http://centos.host-engine.com/6.6/isos/i386/
http://mirrors.gigenet.com/centos/6.6/isos/i386/
http://mirror.cogentco.com/pub/linux/centos/6.6/isos/i386/
http://mirrors.loosefoot.com/centos/6.6/isos/i386/
http://mirror.team-cymru.org/CentOS/6.6/isos/i386/
http://mirrors.arsc.edu/centos/6.6/isos/i386/
http://mirror.raystedman.net/centos/6.6/isos/i386/
http://mirrors.advancedhosters.com/centos/6.6/isos/i386/

Mirrors Verified Sun Feb 1 11:31:00 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