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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://centos.unixheads.org/6.9/isos/x86_64/
http://mirrors.centos.webair.com/centos/6.9/isos/x86_64/
http://mirrors.tummy.com/mirrors/CentOS/6.9/isos/x86_64/
http://mirrors.greenmountainaccess.net/centos/6.9/isos/x86_64/
http://centos.mirror.constant.com/6.9/isos/x86_64/
http://bay.uchicago.edu/centos/6.9/isos/x86_64/
http://ftpmirror.your.org/pub/centos/6.9/isos/x86_64/
http://repos.forethought.net/centos/6.9/isos/x86_64/
http://mirror.pac-12.org/6.9/isos/x86_64/
http://mirror.clarkson.edu/centos/6.9/isos/x86_64/
http://repo1.dal.innoscale.net/centos/6.9/isos/x86_64/
http://mirror.sigmanet.com/centos/6.9/isos/x86_64/
http://centos.mbni.med.umich.edu/mirror/6.9/isos/x86_64/
http://repos.lax.quadranet.com/centos/6.9/isos/x86_64/
http://repo1.ash.innoscale.net/centos/6.9/isos/x86_64/
http://mirrors.liquidweb.com/CentOS/6.9/isos/x86_64/
http://mirror.compevo.com/centos/6.9/isos/x86_64/
http://centos-distro.1gservers.com/6.9/isos/x86_64/
http://mirrors.seas.harvard.edu/centos/6.9/isos/x86_64/
http://mirror.san.fastserv.com/pub/linux/centos/6.9/isos/x86_64/
http://mirror.cisp.com/CentOS/6.9/isos/x86_64/
http://mirror.jax.hugeserver.com/centos/6.9/isos/x86_64/
http://mirror.datto.com/CentOS/6.9/isos/x86_64/
http://mirror.vtti.vt.edu/centos/6.9/isos/x86_64/
http://repos.mia.quadranet.com/centos/6.9/isos/x86_64/
http://mirror.confluxtech.com/centos/6.9/isos/x86_64/
http://mirror.cogentco.com/pub/linux/centos/6.9/isos/x86_64/
http://mirror.cs.vt.edu/pub/CentOS/6.9/isos/x86_64/
http://mirrors.kernel.org/centos/6.9/isos/x86_64/
http://ftp.linux.ncsu.edu/pub/CentOS/6.9/isos/x86_64/
http://centos.blazar.mx/6.9/isos/x86_64/
http://mirrors.cmich.edu/centos/6.9/isos/x86_64/
http://chicago.gaminghost.co/6.9/isos/x86_64/
http://mirror.es.its.nyu.edu/centos/6.9/isos/x86_64/
http://mirrors.arsc.edu/centos/6.9/isos/x86_64/
http://repos.dfw.quadranet.com/centos/6.9/isos/x86_64/
http://reflector.westga.edu/repos/CentOS/6.9/isos/x86_64/
http://mirror.net.cen.ct.gov/centos/6.9/isos/x86_64/
http://mirror.millry.co/CentOS/6.9/isos/x86_64/
http://mirror.cs.uwp.edu/pub/centos/6.9/isos/x86_64/
http://repo.us.bigstepcloud.com/centos/6.9/isos/x86_64/
http://ftp.usf.edu/pub/centos/6.9/isos/x86_64/
http://mirrors.rit.edu/centos/6.9/isos/x86_64/
http://mirror.raystedman.net/centos/6.9/isos/x86_64/
http://mirrors.gigenet.com/centos/6.9/isos/x86_64/
http://repos-tx.psychz.net/centos/6.9/isos/x86_64/
http://mirror.team-cymru.org/CentOS/6.9/isos/x86_64/
http://mirror.trouble-free.net/centos/6.9/isos/x86_64/
http://mirror.us-midwest-1.nexcess.net/CentOS/6.9/isos/x86_64/
http://mirror.atlanticmetro.net/centos/6.9/isos/x86_64/

Mirrors Verified Mon Jun 26 10:10:42 2017 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