In order to conserve the limited bandwidth available, ISO images are not downloadable from mirror.centos.org

http://mirror.cisp.com/CentOS/8.0.1905/isos/x86_64/

http://mirror.metrocast.net/centos/8.0.1905/isos/x86_64/
http://mirror.math.princeton.edu/pub/centos/8.0.1905/isos/x86_64/
http://ftp.osuosl.org/pub/centos/8.0.1905/isos/x86_64/
http://centos4.zswap.net/8.0.1905/isos/x86_64/
http://mirror.vcu.edu/pub/gnu_linux/centos/8.0.1905/isos/x86_64/
http://mirror.facebook.net/centos/8.0.1905/isos/x86_64/
http://mirror.ilumno.com/centos/8.0.1905/isos/x86_64/
http://mirror.sjc02.svwh.net/centos/8.0.1905/isos/x86_64/
http://centos.den.host-engine.com/8.0.1905/isos/x86_64/
http://centos.mirrors.hoobly.com/8.0.1905/isos/x86_64/
http://repo.miserver.it.umich.edu/centos/8.0.1905/isos/x86_64/
http://centos.s.uw.edu/centos/8.0.1905/isos/x86_64/
http://distro.ibiblio.org/centos/8.0.1905/isos/x86_64/
http://mirrors.codec-cluster.org/centos/8.0.1905/isos/x86_64/
http://mirrors.oit.uci.edu/centos/8.0.1905/isos/x86_64/
http://centos.mirror.constant.com/8.0.1905/isos/x86_64/
http://mirror.hackingand.coffee/centos/8.0.1905/isos/x86_64/
http://repo1.sea.innoscale.net/centos/8.0.1905/isos/x86_64/
http://packages.oit.ncsu.edu/centos/8.0.1905/isos/x86_64/
http://www.gtlib.gatech.edu/pub/centos/8.0.1905/isos/x86_64/
http://mirror.cs.vt.edu/pub/CentOS/8.0.1905/isos/x86_64/
http://mirror.atlanticmetro.net/centos/8.0.1905/isos/x86_64/
http://mirror.atlantic.net/centos/8.0.1905/isos/x86_64/
http://mirror.den1.denvercolo.net/CentOS/8.0.1905/isos/x86_64/
http://centos.mirror.ndchost.com/8.0.1905/isos/x86_64/
http://mirror.rackspace.com/CentOS/8.0.1905/isos/x86_64/
http://bay.uchicago.edu/centos/8.0.1905/isos/x86_64/
http://linux.mirrors.es.net/centos/8.0.1905/isos/x86_64/
http://mirrors.liquidweb.com/CentOS/8.0.1905/isos/x86_64/
+ others, see the full list of mirrors: https://www.centos.org/download/mirrors/

Mirrors verified Tue Jan 14 17:50:18 2020 UTC

You can also download the ISO images using bittorrent, a peer-to-peer file sharing protocol. The .torrent files can be found from CentOS mirrors. Various bittorrent clients are available, including (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: https://wiki.centos.org/AdditionalResources/Repositories