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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-centos.hostingswift.com/centos/6.6/isos/x86_64/
http://mirrors.rit.edu/centos/6.6/isos/x86_64/
http://distro.ibiblio.org/centos/6.6/isos/x86_64/
http://repos.lax.quadranet.com/centos/6.6/isos/x86_64/
http://mirror.hmc.edu/centos/6.6/isos/x86_64/
http://pubmirrors.dal.corespace.com/centos/6.6/isos/x86_64/
http://repo.dimenoc.com/pub/centos/6.6/isos/x86_64/
http://repo.atlantic.net/centos/6.6/isos/x86_64/
http://mirrors.lga7.us.voxel.net/centos/6.6/isos/x86_64/
http://mirror.cs.pitt.edu/centos/6.6/isos/x86_64/
http://mirror.san.fastserv.com/pub/linux/centos/6.6/isos/x86_64/
http://mirrors.chkhosting.com/centos/6.6/isos/x86_64/
http://mirror.clarkson.edu/centos/6.6/isos/x86_64/
http://mirror.cogentco.com/pub/linux/centos/6.6/isos/x86_64/
http://lug.mtu.edu/centos/6.6/isos/x86_64/
http://centos.mirror.constant.com/6.6/isos/x86_64/
http://centos.host-engine.com/6.6/isos/x86_64/
http://mirror.rackspace.com/CentOS/6.6/isos/x86_64/
http://mirror.lax.hugeserver.com/centos/6.6/isos/x86_64/
http://mirrors.advancedhosters.com/centos/6.6/isos/x86_64/
http://mirror.spro.net/centos/6.6/isos/x86_64/
http://centos-mirror.jchost.net/6.6/isos/x86_64/
http://mirrors.greenmountainaccess.net/centos/6.6/isos/x86_64/
http://mirrors.cat.pdx.edu/centos/6.6/isos/x86_64/
http://ftp.osuosl.org/pub/centos/6.6/isos/x86_64/
http://repos.redrockhost.com/centos/6.6/isos/x86_64/
http://ftp.usf.edu/pub/centos/6.6/isos/x86_64/
http://mirror.steadfast.net/centos/6.6/isos/x86_64/
http://mirrors.arsc.edu/centos/6.6/isos/x86_64/
http://mirror.symnds.com/CentOS/6.6/isos/x86_64/
http://mirror.cc.columbia.edu/pub/linux/centos/6.6/isos/x86_64/
http://mirrors.sonic.net/centos/6.6/isos/x86_64/
http://centos.sonn.com/6.6/isos/x86_64/
http://mirror.nexcess.net/CentOS/6.6/isos/x86_64/
http://mirrors.adams.net/centos/6.6/isos/x86_64/
http://mirrors.usc.edu/pub/linux/distributions/centos/6.6/isos/x86_64/
ftp://ftp.ussg.iu.edu/linux/centos/6.6/isos/x86_64/
http://mirror.cisp.com/CentOS/6.6/isos/x86_64/
http://mirror.oss.ou.edu/centos/6.6/isos/x86_64/
http://mirror.supremebytes.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://mirror.atlanticmetro.net/centos/6.6/isos/x86_64/
http://mirrors.einstein.yu.edu/centos/6.6/isos/x86_64/
http://mirror.net.cen.ct.gov/centos/6.6/isos/x86_64/
http://centos.mirrors.hoobly.com/6.6/isos/x86_64/
http://mirror.teklinks.com/centos/6.6/isos/x86_64/
http://mirrors.centos.webair.com/centos/6.6/isos/x86_64/
http://centos.mirror.nac.net/6.6/isos/x86_64/
http://yum.tamu.edu/centos/6.6/isos/x86_64/

Mirrors Verified Thu May 28 23:49:18 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