The Big Forum List

Sites with over 2.5 million posts will also have additional data which has been submitted or that I have managed to collect, hopefully increasing in quantity over time. Some of this data can be seen in a collated graphic form at the end of this post.

Entries in orange are new installations. Converts from vBulletin are in purple. Converts from IPB are in yellow. Converts from SMF are in pink. Converts from MyBB are in green. Bolded black indicates proprietary or other, while uncoloured hyperlinks mean I don't know.

Over 20,000,000 posts

6 sites (ranked in size order, rounded to 1m)

(~ 96m) http://www.ign.com/boards/ (gaming) (English)

(~ 29m) http://www.bigsoccer.com/ (sport) (English)

(~ 29m) http://www.bigfooty.com/forum/ (sport) (English)

(~ 24m) http://www.sternfannetwork.com/xen/index.php?forum/ (fansite) (English)

(~ 22m) http://muare.vn/index/ha-noi/ (general) (Vietnamese)

(~ 21m) http://boards.theforce.net/ (film) (English)

Over 10,000,000 posts

10 sites (ranked in size order, rounded to 1m)

(~ 18m) http://www.tinhte.vn/ (technology) (Vietnamese)

(~ 18m) http://www.antronio.com/ (general) (Spanish)

(~ 17m) https://forums.digitalpoint.com/ (other) (English)

(~ 14m) http://www.smashboards.com/ (gaming) (English)

(~ 14m) http://www.redcafe.net/forum/ (sport) (English)

(~ 13m) http://www.bmwfaq.com/ (Vehicles) (Spanish)

(~ 13m) http://www.urban75.net/forums/ (other) (English)

(~ 12m) http://www.nonewbs.com/index.php (general) (English)

(~ 12m) http://forums.spacebattles.com/ (other) (English)

(~ 10m) http://the-mainboard.com/ (sport) (English)

Over 5,000,000 posts

9 sites (ranked in size order, rounded to .1m)

(~ 9.3m) http://rapmusic.com/ (music) (English)

(~ 9.1m) http://forums.stevehoffman.tv/ (music) (English)

(~ 8.8m) http://forum.360kpop.com/ (music) (Vietnamese)

(~ 7.8m) http://bbs.comefromchina.com/ (general) (Chinese)

(~ 6.7m) http://www.planet-liebe.de/community/ (other) (German)

(~ 6.0m) http://www.se7ensins.com/forums/ (gaming) (English)

(~ 6.0m) http://www.thecoli.com/

(~ 5.8m) http://forum.kajgana.com/ (general) (Macedonian)

(~ 5.5m) http://www.forumhouse.ru/ (other) (Russian)

Over 2,500,000 posts

15 sites (ranked in size order, ranked to .1m)

(~ 4.5m) http://www.v6mustang.com/ (vehicles) (English)

(~ 4.3m) http://gbatemp.net/ (gaming) (English)

(~ 4.1m) http://www.stangnet.com/mustang-forums/ (vehicles (English)

(~ 3.9m) http://forums.freddyshouse.com/ (gaming) (English)

(~ 4.0m) http://cemzoo.com/index.php (other) (Spanish)

(~ 3.8m) http://kh-vids.net/forum/ (gaming) (English)

(~ 3.2m) http://www.valvetime.net/index.php?forum/ (gaming) (English)

(~ 3.4m) http://www.decerto.net/v4/index.php?forum/ (gaming) (English)

(~ 3.0m) http://fanficslandia.com/index.php (fansite) (Spanish)

(~ 2.9m) http://www.ifans.com/forums/ (technology) (English)

(~ 3.0m) http://www.fiveeightforums.com/ (music) (English)

(~ 2.8m) http://turbobuick.com/forums/ (vehicles) (English)

(~ 2.9m) http://www.rennrad-news.de/forum/ (sport) (German)

(~ 2.7m) http://www.cyclechat.net/ (sport) (English)

(~ 2.5m) http://forum.valinor.com.br/ (fansite) (Portuguese)

Over 1,000,000 posts

45 sites (Updated: 28th October 2013)

http://www.orangepower.com/

http://www.vauxhallownersnetwork.co.uk/index.php

http://www.reallymeansounds.com/forum/

http://www.terrariaonline.com/forum/

http://forums.whyweprotest.net/

http://www.nucastle.co.uk/index.php

http://www.zroadster.com/forum/index.php

http://milepoint.com/forums/ 

http://forums.jetcareers.com/

http://www.racedepartment.com/forum/

http://www.aktion-abenteuer.de/b/

http://www.p8ntballer-forums.com/

http://www.plusgsm.com.br/

http://community.stratics.com/index.php

http://www.ozcardtrader.com.au/community/

http://www.hearth.com/talk/

http://discussions.tv/

http://www.flashpoint.ru/

http://www.techspot.com/community/

http://www.wtf.com/

http://forums.bukkit.org/

http://priuschat.com/

http://forums.traditionsportsonline.com/

http://www.urduweb.org/mehfil/

http://www.thehelper.net/forum/

http://www.traumfeuer.com/

http://www.psymusic.co.uk/forum/portal/

http://www.netrider.net.au/

http://www.TigerFan.com

http://www.thewholesaleforums.co.uk/

http://stratics.com/community/

http://edcforums.com/

http://realitygaming.fr/

http://www.techenclave.com/community/

http://thumped.com/bbs/

http://www.manutdtalk.com/index.php?forum/

http://www.turkish-talk.com/

http://beeradvocate.com/community/

http://forums.station.sony.com/ps2/index.php

http://www.soccer-fans.de/forum/

http://www.writingforums.org/

http://www.cointalk.com/

http://www.testyourmight.com/

http://www.avsite.gr/forum/portal/

Over 500,000 posts

42 sites (Updated: 28th October 2013)

http://www.everythingicafe.com/forum/

http://www.sportgfx.com/

http://dance-forums.com/

http://forum.team-mediaportal.com/

http://forumi.shqiperia.com/

http://www.runuo.com/community/

http://mnsubaru.com/

http://insaneindustry.com/community/

http://www.treasurequestxlt.com/community/index.php

http://masscops.com/

http://gardenerscorner.co.uk/forum/

http://www.almeraownersclub.com/

http://www.lonestarstangs.com/

http://www.germancarforum.com/community/

http://minecraft.fr/forum/index.php

http://www.micra.org.uk/

http://www.germancarforum.com/community/

http://www.surcity.net/forums/

http://rpg-directory.com/

http://civilwartalk.com/

http://forum.fitnessbloggen.no/

http://syracusefan.com/

http://the-boneyard.com/

http://www.halforums.com/xenforo/

http://www.smsmasters.co.uk/forum/portal/

https://www.ptsdforum.org/c/

http://turkrock.com/

http://fringefx.net/

http://community.playstarbound.com/index.php

http://www.feoa.net/

http://mudboggers.net/

http://wweforums.net/

http://xenforo.com/community/

http://www.iwakuroleplay.com/

http://www.politicaljack.com/

http://ukofequestria.co.uk/

https://www.xtremepapers.com/community/

http://www.truckmountforums.com/

http://8wayrun.com/

http://www.rubukkit.org/

http://fr.decerto.net/index.php

http://www.soxhaps.com/

http://www.sportscardclub.com/

http://markweinguitarlessons.com/forums/

http://www.elternforen.com/

http://brokenforum.com/index.php

Over 250,000 posts

At least 33 sites* (Final Update 08/06/2013)

http://cliptheapex.com/

http://www.the-sps.org/

http://www.bigcricket.com/community/

http://forum.computerbetrug.de/

http://www.dragonslist.com/

http://thebestforumever.com/community/

http://www.a6ba.com/forum/

http://www.planetfigure.com/forum/

http://www.cheerforum.de/

http://www.casualplayers.org/forums/

http://forums.megagames.com/

http://www2.muziktek.net/index.php

http://www.shottalk.com/

http://www.piratesahoy.net/forum/

https://forum.encyclopediadramatica.se/forum/

http://www.adminforums.org/

https://www.team9000.net/forums/

http://www.skial.com/

http://www.rpdom.com/

http://www.cruisingtalk.com/

http://www.cricistan.com/forums/

http://www.motorcycleaddicts.org/community/

http://www.survivalmonkey.com/

http://www.immobilio.it/

http://www.bookandreader.com/

http://www.crazyengineers.com/community/

http://www.truckersforum.net/forum/

http://www.scooterforum.no/index.php

http://www.phcorner.net/

http://forum.fierceboard.com/

http://www.travelstories.gr/community/

http://www.chaosreads.com/

http://russianmeetingplace.com/forums/index.php

http://www.ukaps.org/forum/​

Over 100,000 posts

At least 36 sites* (Final Update 08/06/2013)

https://www.passatclubept.com/comunidade/index.php

http://salsaforums.com/

http://gamesonly.org/

http://www.forum.bidka.org/

http://www.partisanlines.com/forum/

http://www.z22se.co.uk/forum/

http://forums.exophase.com/

http://forums.kayako.com/

http://palpadpark.com/index.php

http://www.tunitech.net/forum/

http://www.houseofpolitics.com/

http://www.cinema-extreme.com/

http://www.wickedstangs.com/community/

http://ukdivers.com/community/

http://www.sociallyuncensored.eu/forums/

http://www.trianglecycling.com/

http://www.appliqueforum.com/

http://caskanja.net/

http://www.gamingmasters.org/

http://www.gatefans.net/gforums/

http://www.thefewgoodmen.com/thefgmforum/

http://www.ge-ru.com/forum/

http://computerhelpforums.net/

http://latindiscussion.com/forum/

http://datingfora.com/

http://www.holdtheline.com/forum/

http://www.bigmoneybox.com/

http://tntu.net/community/

http://forum.kog.it/

http://propit.it/

http://www.8thos.com/

http://gfxforums.net/

http://www.keyboardforums.com/

http://9alam.com/community/

http://forum.veggieviews.com/

http://www.kellerbude.de/​