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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://mirror.hmc.edu/centos/6.6/isos/x86_64/
http://cosmos.cites.illinois.edu/pub/centos/6.6/isos/x86_64/
http://mirrors.liquidweb.com/CentOS/6.6/isos/x86_64/
http://mirrors.arsc.edu/centos/6.6/isos/x86_64/
http://centos.expedientevirtual.com/6.6/isos/x86_64/
http://mirrors.einstein.yu.edu/centos/6.6/isos/x86_64/
http://linux.cc.lehigh.edu/centos/6.6/isos/x86_64/
http://mirror.nwresd.org/pub/centos/6.6/isos/x86_64/
http://mirrors.xmission.com/centos/6.6/isos/x86_64/
http://mirrors.cmich.edu/centos/6.6/isos/x86_64/
http://mirrors.tummy.com/mirrors/CentOS/6.6/isos/x86_64/
http://centos.mirror.constant.com/6.6/isos/x86_64/
http://mirrors.rit.edu/centos/6.6/isos/x86_64/
http://mirror.pac-12.org/6.6/isos/x86_64/
http://mirror.raystedman.net/centos/6.6/isos/x86_64/
http://mirrors.lga7.us.voxel.net/centos/6.6/isos/x86_64/
http://mirror.thelinuxfix.com/CentOS/6.6/isos/x86_64/
http://mirror.lug.udel.edu/pub/centos/6.6/isos/x86_64/
http://ftpmirror.your.org/pub/centos/6.6/isos/x86_64/
http://mirrors.cat.pdx.edu/centos/6.6/isos/x86_64/
http://mirror.rackspace.com/CentOS/6.6/isos/x86_64/
http://mirrors.kernel.org/centos/6.6/isos/x86_64/
http://mirror.cisp.com/CentOS/6.6/isos/x86_64/
http://mirrordenver.fdcservers.net/centos/6.6/isos/x86_64/
http://mirrors.usc.edu/pub/linux/distributions/centos/6.6/isos/x86_64/
http://mirrors.sonic.net/centos/6.6/isos/x86_64/
http://mirror.acsnet.com/centos/6.6/isos/x86_64/
http://centos.mirror.ndchost.com/6.6/isos/x86_64/
http://mirror.solarvps.com/centos/6.6/isos/x86_64/
http://centos.mirror.lstn.net/6.6/isos/x86_64/
http://linux.mirrors.es.net/centos/6.6/isos/x86_64/
http://mirrors.loosefoot.com/centos/6.6/isos/x86_64/
http://mirror.compevo.com/centos/6.6/isos/x86_64/
http://repos.mia.quadranet.com/centos/6.6/isos/x86_64/
http://centos.mirrors.hoobly.com/6.6/isos/x86_64/
http://centos.mirrors.tds.net/pub/linux/centos/6.6/isos/x86_64/
http://mirror.sanctuaryhost.com/centos/6.6/isos/x86_64/
http://dist1.800hosting.com/centos/6.6/isos/x86_64/
http://mirror.cs.pitt.edu/centos/6.6/isos/x86_64/
http://centos.mia.host-engine.com/6.6/isos/x86_64/
http://ftp.linux.ncsu.edu/pub/CentOS/6.6/isos/x86_64/
http://mirror.cogentco.com/pub/linux/centos/6.6/isos/x86_64/
http://mirror.cs.uwp.edu/pub/centos/6.6/isos/x86_64/
http://mirror.net.cen.ct.gov/centos/6.6/isos/x86_64/
http://mirror.san.fastserv.com/pub/linux/centos/6.6/isos/x86_64/
http://mirror-centos.hostingswift.com/centos/6.6/isos/x86_64/
http://mirrors.syringanetworks.net/centos/6.6/isos/x86_64/
http://mirrors.advancedhosters.com/centos/6.6/isos/x86_64/
http://mirror.ash.fastserv.com/pub/linux/centos/6.6/isos/x86_64/
http://mirror.teklinks.com/centos/6.6/isos/x86_64/

Mirrors Verified Fri Nov 7 02:26:23 2014 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