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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.umd.edu/centos/6.6/isos/x86_64/
http://mirror.pac-12.org/6.6/isos/x86_64/
http://mirrors.lga7.us.voxel.net/centos/6.6/isos/x86_64/
http://mirror.rackspace.com/CentOS/6.6/isos/x86_64/
http://mirrors.usc.edu/pub/linux/distributions/centos/6.6/isos/x86_64/
http://repos.redrockhost.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://mirror.hostduplex.com/centos/6.6/isos/x86_64/
http://mirror.tocici.com/centos/6.6/isos/x86_64/
http://mirrors.liquidweb.com/CentOS/6.6/isos/x86_64/
http://mirror.metrocast.net/centos/6.6/isos/x86_64/
http://repos.mia.quadranet.com/centos/6.6/isos/x86_64/
http://distro.ibiblio.org/centos/6.6/isos/x86_64/
http://mirror.solarvps.com/centos/6.6/isos/x86_64/
http://mirror.spro.net/centos/6.6/isos/x86_64/
http://mirrors.centarra.com/centos/6.6/isos/x86_64/
http://mirrors.advancedhosters.com/centos/6.6/isos/x86_64/
http://mirrors.mit.edu/centos/6.6/isos/x86_64/
http://mirror.anl.gov/pub/centos/6.6/isos/x86_64/
http://mirrors.greenmountainaccess.net/centos/6.6/isos/x86_64/
http://mirror.chpc.utah.edu/pub/centos/6.6/isos/x86_64/
http://centos.den.host-engine.com/6.6/isos/x86_64/
http://mirrors.syringanetworks.net/centos/6.6/isos/x86_64/
http://centos.host-engine.com/6.6/isos/x86_64/
http://mirrors.usinternet.com/centos/6.6/isos/x86_64/
http://mirror.fdcservers.net/centos/6.6/isos/x86_64/
http://centos.eecs.wsu.edu/6.6/isos/x86_64/
http://mirror.trouble-free.net/centos/6.6/isos/x86_64/
http://mirrors.gigenet.com/centos/6.6/isos/x86_64/
http://mirror.supremebytes.com/centos/6.6/isos/x86_64/
http://mirror.web-ster.com/centos/6.6/isos/x86_64/
http://centos.mirror.constant.com/6.6/isos/x86_64/
http://centos.expedientevirtual.com/6.6/isos/x86_64/
http://bay.uchicago.edu/centos/6.6/isos/x86_64/
http://centos-mirror.jchost.net/6.6/isos/x86_64/
http://mirror.lug.udel.edu/pub/centos/6.6/isos/x86_64/
http://mirror.keystealth.org/centos/6.6/isos/x86_64/
http://mirror.ubiquityservers.com/centos/6.6/isos/x86_64/
http://mirrors.tummy.com/mirrors/CentOS/6.6/isos/x86_64/
http://yum.tamu.edu/centos/6.6/isos/x86_64/
http://centos.mirror.nac.net/6.6/isos/x86_64/
http://mirror.raystedman.net/centos/6.6/isos/x86_64/
http://centos.mirror.ndchost.com/6.6/isos/x86_64/
http://centos.mirrors.hoobly.com/6.6/isos/x86_64/
http://mirror.cs.vt.edu/pub/CentOS/6.6/isos/x86_64/
http://ftp.osuosl.org/pub/centos/6.6/isos/x86_64/
http://repos.dfw.quadranet.com/centos/6.6/isos/x86_64/
http://mirror.millry.co/CentOS/6.6/isos/x86_64/

Mirrors Verified Sun Jan 25 13:18:24 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