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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://yum.tamu.edu/centos/6.6/isos/x86_64/
http://mirrors.liquidweb.com/CentOS/6.6/isos/x86_64/
http://mirror.sanctuaryhost.com/centos/6.6/isos/x86_64/
http://mirror.raystedman.net/centos/6.6/isos/x86_64/
http://centos.mirror.lstn.net/6.6/isos/x86_64/
http://mirror.cisp.com/CentOS/6.6/isos/x86_64/
http://centos.mirror.constant.com/6.6/isos/x86_64/
http://mirrors.umflint.edu/CentOS/6.6/isos/x86_64/
http://distro.ibiblio.org/centos/6.6/isos/x86_64/
http://mirror.es.its.nyu.edu/centos/6.6/isos/x86_64/
http://centos.mirror.nac.net/6.6/isos/x86_64/
http://linux.mirrors.es.net/centos/6.6/isos/x86_64/
http://mirror.5ninesolutions.com/centos/6.6/isos/x86_64/
http://mirror.rackspace.com/CentOS/6.6/isos/x86_64/
http://mirror.redsox.cc/pub/CentOS/6.6/isos/x86_64/
http://mirror.cogentco.com/pub/linux/centos/6.6/isos/x86_64/
http://mirrors.advancedhosters.com/centos/6.6/isos/x86_64/
http://centos.den.host-engine.com/6.6/isos/x86_64/
http://mirrors.cmich.edu/centos/6.6/isos/x86_64/
http://mirrors.maine.edu/CentOS/6.6/isos/x86_64/
http://ftp.usf.edu/pub/centos/6.6/isos/x86_64/
http://centos.unixheads.org/6.6/isos/x86_64/
http://mirror.us.oneandone.net/linux/distributions/centos/6.6/isos/x86_64/
http://mirror.tocici.com/centos/6.6/isos/x86_64/
http://centos-mirror.jchost.net/6.6/isos/x86_64/
http://mirror.ubiquityservers.com/centos/6.6/isos/x86_64/
http://centos.arvixe.com/6.6/isos/x86_64/
http://centos.eecs.wsu.edu/6.6/isos/x86_64/
http://mirror.acsnet.com/centos/6.6/isos/x86_64/
http://repos.redrockhost.com/centos/6.6/isos/x86_64/
http://www.gtlib.gatech.edu/pub/centos/6.6/isos/x86_64/
http://mirror.dattobackup.com/CentOS/6.6/isos/x86_64/
http://centos.mbni.med.umich.edu/mirror/6.6/isos/x86_64/
http://cosmos.cites.illinois.edu/pub/centos/6.6/isos/x86_64/
http://mirror.team-cymru.org/CentOS/6.6/isos/x86_64/
http://mirror.ash.fastserv.com/pub/linux/centos/6.6/isos/x86_64/
http://mirror.umd.edu/centos/6.6/isos/x86_64/
http://dist1.800hosting.com/centos/6.6/isos/x86_64/
http://mirrors.arsc.edu/centos/6.6/isos/x86_64/
http://mirror.spro.net/centos/6.6/isos/x86_64/
http://centos.mirrors.hoobly.com/6.6/isos/x86_64/
http://mirror.oss.ou.edu/centos/6.6/isos/x86_64/
http://mirrors.gigenet.com/centos/6.6/isos/x86_64/
http://mirror.vtti.vt.edu/centos/6.6/isos/x86_64/
http://mirror.clarkson.edu/centos/6.6/isos/x86_64/
http://mirrors.adams.net/centos/6.6/isos/x86_64/
http://mirrors.lga7.us.voxel.net/centos/6.6/isos/x86_64/
http://mirror.nexcess.net/CentOS/6.6/isos/x86_64/
http://mirror.steadfast.net/centos/6.6/isos/x86_64/
http://mirror.san.fastserv.com/pub/linux/centos/6.6/isos/x86_64/

Mirrors Verified Fri Jul 31 08:59:08 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