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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.acsnet.com/centos/6.6/isos/x86_64/
http://mirror.cs.vt.edu/pub/CentOS/6.6/isos/x86_64/
http://mirrors.cmich.edu/centos/6.6/isos/x86_64/
http://linux.mirrors.es.net/centos/6.6/isos/x86_64/
http://mirror.cs.pitt.edu/centos/6.6/isos/x86_64/
http://mirror.compevo.com/centos/6.6/isos/x86_64/
http://mirrors.syringanetworks.net/centos/6.6/isos/x86_64/
http://mirror.keystealth.org/centos/6.6/isos/x86_64/
http://centos.mirrors.hoobly.com/6.6/isos/x86_64/
http://mirror.ancl.hawaii.edu/linux/centos/6.6/isos/x86_64/
http://centos.eecs.wsu.edu/6.6/isos/x86_64/
http://centos-mirror.jchost.net/6.6/isos/x86_64/
http://reflector.westga.edu/repos/CentOS/6.6/isos/x86_64/
http://mirror.us.leaseweb.net/centos/6.6/isos/x86_64/
http://mirrors.tummy.com/mirrors/CentOS/6.6/isos/x86_64/
http://mirror.cc.columbia.edu/pub/linux/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.san.fastserv.com/pub/linux/centos/6.6/isos/x86_64/
http://mirrors.usc.edu/pub/linux/distributions/centos/6.6/isos/x86_64/
http://mirror.lax.hugeserver.com/centos/6.6/isos/x86_64/
http://mirror.metrocast.net/centos/6.6/isos/x86_64/
http://bay.uchicago.edu/centos/6.6/isos/x86_64/
http://mirror.millry.co/CentOS/6.6/isos/x86_64/
http://yum.tamu.edu/centos/6.6/isos/x86_64/
http://mirrors.sonic.net/centos/6.6/isos/x86_64/
http://mirror.hmc.edu/centos/6.6/isos/x86_64/
http://www.gtlib.gatech.edu/pub/centos/6.6/isos/x86_64/
http://mirror.team-cymru.org/CentOS/6.6/isos/x86_64/
http://mirror.cisp.com/CentOS/6.6/isos/x86_64/
http://pubmirrors.dal.corespace.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.tzulo.com/centos/6.6/isos/x86_64/
http://mirror.web-ster.com/centos/6.6/isos/x86_64/
http://ftp.usf.edu/pub/centos/6.6/isos/x86_64/
http://centos.mirror.constant.com/6.6/isos/x86_64/
http://mirror.trouble-free.net/centos/6.6/isos/x86_64/
http://centos.mirror.lstn.net/6.6/isos/x86_64/
http://centos.unixheads.org/6.6/isos/x86_64/
http://mirror.rackspace.com/CentOS/6.6/isos/x86_64/
http://repos.redrockhost.com/centos/6.6/isos/x86_64/
http://centos.mirrors.tds.net/pub/linux/centos/6.6/isos/x86_64/
http://mirrors.psychz.net/Centos/6.6/isos/x86_64/
http://mirrors.greenmountainaccess.net/centos/6.6/isos/x86_64/
http://mirror.5ninesolutions.com/centos/6.6/isos/x86_64/
http://mirrors.liquidweb.com/CentOS/6.6/isos/x86_64/
http://repo.dimenoc.com/pub/centos/6.6/isos/x86_64/
http://ftpmirror.your.org/pub/centos/6.6/isos/x86_64/
http://mirror.es.its.nyu.edu/centos/6.6/isos/x86_64/

Mirrors Verified Tue Aug 4 17:21:00 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