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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://repo.us.bigstepcloud.com/centos/6.9/isos/x86_64/
http://mirror.cogentco.com/pub/linux/centos/6.9/isos/x86_64/
http://repos.dfw.quadranet.com/centos/6.9/isos/x86_64/
http://mirror.jaleco.com/centos/6.9/isos/x86_64/
http://ftp.usf.edu/pub/centos/6.9/isos/x86_64/
http://ftp.osuosl.org/pub/centos/6.9/isos/x86_64/
http://mirror.pac-12.org/6.9/isos/x86_64/
http://mirror.cs.vt.edu/pub/CentOS/6.9/isos/x86_64/
http://centos-distro.1gservers.com/6.9/isos/x86_64/
http://mirror.linuxfix.com/centos/6.9/isos/x86_64/
http://centos.localmsp.org/centos/6.9/isos/x86_64/
http://mirror.es.its.nyu.edu/centos/6.9/isos/x86_64/
http://mirror.lug.udel.edu/pub/centos/6.9/isos/x86_64/
http://mirror.vtti.vt.edu/centos/6.9/isos/x86_64/
http://mirrors.liquidweb.com/CentOS/6.9/isos/x86_64/
http://mirror.sesp.northwestern.edu/centos/6.9/isos/x86_64/
http://distro.ibiblio.org/centos/6.9/isos/x86_64/
http://mirror.raystedman.net/centos/6.9/isos/x86_64/
http://mirror.jax.hugeserver.com/centos/6.9/isos/x86_64/
http://centos.gbeservers.com/6.9/isos/x86_64/
ftp://ftp.ussg.iu.edu/linux/centos/6.9/isos/x86_64/
http://mirror.cisp.com/CentOS/6.9/isos/x86_64/
http://mirror.tzulo.com/centos/6.9/isos/x86_64/
http://mirror.san.fastserv.com/pub/linux/centos/6.9/isos/x86_64/
http://mirror.web-ster.com/centos/6.9/isos/x86_64/
http://linux.cc.lehigh.edu/centos/6.9/isos/x86_64/
http://mirror.sjc02.svwh.net/centos/6.9/isos/x86_64/
http://mirror.atlanticmetro.net/centos/6.9/isos/x86_64/
http://mirror.us-midwest-1.nexcess.net/CentOS/6.9/isos/x86_64/
http://www.gtlib.gatech.edu/pub/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.mirrors.tds.net/pub/linux/centos/6.9/isos/x86_64/
http://centos.mbni.med.umich.edu/mirror/6.9/isos/x86_64/
http://mirrors.sonic.net/centos/6.9/isos/x86_64/
http://repos.forethought.net/centos/6.9/isos/x86_64/
http://centos.s.uw.edu/centos/6.9/isos/x86_64/
http://mirrors.seas.harvard.edu/centos/6.9/isos/x86_64/
http://centos.mirror.lstn.net/6.9/isos/x86_64/
http://ftp.linux.ncsu.edu/pub/CentOS/6.9/isos/x86_64/
http://mirror.umd.edu/centos/6.9/isos/x86_64/
http://mirror.solarvps.com/centos/6.9/isos/x86_64/
http://centos.mirror.constant.com/6.9/isos/x86_64/
http://repos.mia.quadranet.com/centos/6.9/isos/x86_64/
http://mirrors.cmich.edu/centos/6.9/isos/x86_64/
http://mirror.sigmanet.com/centos/6.9/isos/x86_64/
http://mirrors.lga7.us.voxel.net/centos/6.9/isos/x86_64/
http://mirror.hmc.edu/centos/6.9/isos/x86_64/
http://centos.unixheads.org/6.9/isos/x86_64/
http://mirror.sfo12.us.leaseweb.net/centos/6.9/isos/x86_64/

Mirrors Verified Fri Nov 24 03:28:11 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