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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.evolvedservers.com/CentOS/6.6/isos/x86_64/
http://mirror.ubiquityservers.com/centos/6.6/isos/x86_64/
http://mirror.dattobackup.com/CentOS/6.6/isos/x86_64/
http://repos.dfw.quadranet.com/centos/6.6/isos/x86_64/
http://distro.ibiblio.org/centos/6.6/isos/x86_64/
http://ftp.osuosl.org/pub/centos/6.6/isos/x86_64/
http://mirror.millry.co/CentOS/6.6/isos/x86_64/
http://mirrors.greenmountainaccess.net/centos/6.6/isos/x86_64/
http://mirrors.rit.edu/centos/6.6/isos/x86_64/
http://mirror.ancl.hawaii.edu/linux/centos/6.6/isos/x86_64/
http://mirror.raystedman.net/centos/6.6/isos/x86_64/
http://repo.dimenoc.com/pub/centos/6.6/isos/x86_64/
http://centos.mia.host-engine.com/6.6/isos/x86_64/
http://centos.mirror.nac.net/6.6/isos/x86_64/
http://centos.escapemg.com/6.6/isos/x86_64/
http://mirror.metrocast.net/centos/6.6/isos/x86_64/
http://mirror.web-ster.com/centos/6.6/isos/x86_64/
ftp://ftp.wallawalla.edu/pub/mirrors/centos/6.6/isos/x86_64/
http://mirror.us.oneandone.net/linux/distributions/centos/6.6/isos/x86_64/
http://mirror.clarkson.edu/centos/6.6/isos/x86_64/
http://mirror.1stclasshosting.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://centos.mirror.lstn.net/6.6/isos/x86_64/
http://centos.sonn.com/6.6/isos/x86_64/
http://cosmos.cites.illinois.edu/pub/centos/6.6/isos/x86_64/
http://mirror.compevo.com/centos/6.6/isos/x86_64/
http://mirror.spro.net/centos/6.6/isos/x86_64/
http://mirrors.tummy.com/mirrors/CentOS/6.6/isos/x86_64/
http://centos.den.host-engine.com/6.6/isos/x86_64/
http://mirrors.einstein.yu.edu/centos/6.6/isos/x86_64/
http://mirror.beyondhosting.net/CentOS/6.6/isos/x86_64/
ftp://ftp.uci.edu/mirrors/centos/6.6/isos/x86_64/
http://mirrors.loosefoot.com/centos/6.6/isos/x86_64/
http://reflector.westga.edu/repos/CentOS/6.6/isos/x86_64/
http://mirrors.maine.edu/CentOS/6.6/isos/x86_64/
http://mirror.vtti.vt.edu/centos/6.6/isos/x86_64/
http://mirrors.sonic.net/centos/6.6/isos/x86_64/
http://mirrors.unifiedlayer.com/centos/6.6/isos/x86_64/
http://mirror.tzulo.com/centos/6.6/isos/x86_64/
http://centos.mirrors.tds.net/pub/linux/centos/6.6/isos/x86_64/
http://mirrors.adams.net/centos/6.6/isos/x86_64/
http://mirror.chpc.utah.edu/pub/centos/6.6/isos/x86_64/
http://mirror.supremebytes.com/centos/6.6/isos/x86_64/
http://mirrors.centarra.com/centos/6.6/isos/x86_64/
http://mirror.atlanticmetro.net/centos/6.6/isos/x86_64/
http://mirror.cs.uwp.edu/pub/centos/6.6/isos/x86_64/
http://mirror.cs.pitt.edu/centos/6.6/isos/x86_64/
http://mirrors.tripadvisor.com/centos/6.6/isos/x86_64/
http://mirror.trouble-free.net/centos/6.6/isos/x86_64/

Mirrors Verified Sat Mar 28 21:36:01 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