Credits to https://www.wowprogress.com for providing population data.

This was added mid-dragonflight, I'll update this one day.

NA

id	realmNames	popBlizz	popWoWProgress	rankWoWProgress
3676	["Area 52"]	3	37919	2
57	["Illidan"]	3	32069	1
60	["Stormrage"]	3	29761	9
3725	["Frostmourne", "Dreadmaul", "Thaurissan", "Jubei'Thos", "Gundrak"]	3	20663	2
11	["Tichondrius"]	3	19990	6
61	["Zul'jin"]	3	19595	5
3678	["Thrall"]	3	18643	7
3684	["Mal'Ganis"]	3	18405	4
1427	["Ragnaros"]	3	16227	13
76	["Sargeras"]	3	15843	8
5	["Proudmoore"]	3	14884	14
3209	["Azralon"]	3	13439	12
1428	["Quel'Thalas"]	3	13083	20
3683	["Dalaran"]	3	11524	18
3723	["Barthilas"]	2	9647	15
73	["Bleeding Hollow"]	2	8496	11
1175	["Trollbane", "Grizzly Hills", "Malfurion", "Lothar", "Kael'thas", "Gnomeregan", "Moonrunner", "Ghostlands"]	2	7020	30
3675	["Moon Guard"]	3	6743	19
3726	["Khaz'goroth", "Aman'Thul", "Dath'Remar"]	2	6363	25
3721	["Caelestrasz", "Nagrand", "Saurfang"]	2	6236	29
3661	["Hyjal"]	2	5790	16
86	["Silvermoon", "Skywall", "Terenas", "Hydraxis", "Drak'thul", "Borean Tundra", "Mok'Nathal", "Shadowsong"]	2	5730	37
104	["Malygos", "Garona", "Lightning's Blade", "Icecrown", "Onyxia", "Burning Blade"]	2	5617	22
162	["Emerald Dream"]	2	5509	17
1171	["Wyrmrest Accord"]	2	5478	26
1136	["Aegwynn", "Gurubashi", "Bonechewer", "Hakkar", "Garrosh", "Daggerspine"]	0	5456	47
1129	["Agamaggan", "Kargath", "Burning Legion", "Thunderhorn", "The Underbog", "Blade's Edge", "Archimonde", "Norgannon", "Jaedenar"]	2	5062	33
1168	["Cairne", "Cenarius", "Frostmane", "Tortheldrin", "Ner'zhul", "Korgath", "Perenolde"]	2	4771	28
96	["Eonar", "Skullcrusher", "Gul'dan", "Zuluhed", "Ursin", "Andorhal", "Black Dragonflight", "Velen", "Scilla"]	2	4657	38
1185	["Sen'jin", "Dunemaul", "Maiev", "Bloodscalp", "Quel'dorei", "Boulderfist", "Stonemaul"]	2	4625	39
84	["Dragonmaw", "Uldum", "Akama", "Korialstrasz", "Eldre'Thalas", "Mug'thol", "Antonidas"]	2	4596	32
3693	["Kel'Thuzad"]	2	4485	21
77	["Azgalor", "Thunderlord", "Destromath", "Blood Furnace", "Mannoroth", "Nazjatar", "Azshara"]	0	4445	40
127	["Firetree", "Drak'Tharon", "Rivendare", "Vashj", "Spirestone", "Malorne", "Frostwolf", "Stormscale"]	2	4104	27
121	["Azjol-Nerub", "Muradin", "Nordrassil", "Blackrock", "Khaz Modan"]	2	3972	31
53	["Hellscream", "Gorefiend", "Spinebreaker", "Zangarmarsh", "Wildhammer", "Eredar"]	3	3918	43
67	["Elune", "Laughing Skull", "Auchindoun", "Cho'gall", "Gilneas"]	1	3816	45
55	["Whisperwind", "Dentarg"]	1	3577	24
9	["Kil'jaeden"]	1	3375	23
3694	["Lightbringer"]	1	3373	60
52	["Alleria", "Exodar", "Medivh", "Khadgar"]	2	3244	34
1425	["Drakkari"]	0	3074	61
113	["Suramar", "Windrunner", "Darrowmere", "Draka"]	1	2837	52
1138	["Chromaggus", "Nathrezim", "Smolderthorn", "Anub'arak", "Arathor", "Garithos", "Drenden", "Crushridge"]	1	2777	46
160	["Staghelm", "Dawnbringer", "Madoran", "Azuremyst"]	1	2662	54
1426	["Aerie Peak"]	1	2259	42
125	["Shadow Council", "Sisters of Elune", "Cenarion Circle", "Blackwater Raiders"]	1	2158	48
106	["Aggramar", "Fizzcrank"]	3	2151	44
3208	["Nemesis", "Tol Barad"]	0	2143	80
71	["Warsong", "Gorgonnash", "The Forgotten Coast", "Balnazzar", "Alterac Mountains", "Undermine", "Anvilmar"]	3	1881	41
63	["Durotan", "Ysera"]	0	1733	56
69	["Arthas"]	0	1665	53
1190	["Baelgun", "Doomhammer"]	0	1630	64
64	["Bloodhoof", "Duskwood"]	0	1611	65
155	["Kalecgos", "Shattered Halls", "Executus", "Deathwing"]	0	1515	36
3685	["Turalyon"]	0	1500	51
163	["Maelstrom", "Twisting Nether", "Lightninghoof", "The Venture Co", "Ravenholdt"]	0	1491	62
12	["Silver Hand", "Thorium Brotherhood", "Farstriders"]	0	1457	68
1184	["Vek'nilash", "Nazgrel", "Nesingwary"]	0	1457	63
118	["Feathermoon", "Scarlet Crusade"]	0	1300	77
54	["Blackhand", "Galakrond"]	0	1279	67
158	["Greymane", "Tanaris"]	0	1190	71
78	["Magtheridon", "Anetheron", "Ysondre", "Altar of Storms"]	0	1174	35
157	["Dark Iron", "Shattered Hand", "Coilfang", "Demon Soul", "Dalvengyr"]	0	1173	50
100	["Earthen Ring"]	0	1153	57
1151	["Rexxar", "Misha"]	0	1126	79
154	["Detheroc", "Dethecus", "Lethon", "Blackwing Lair", "Shadowmoon", "Haomarush"]	0	1069	49
1147	["Kul Tiras", "Bladefist"]	0	1056	58
115	["Draenor", "Echo Isles"]	0	1054	72
114	["Dragonblight", "Fenris"]	0	1038	73
151	["Runetotem", "Uther"]	0	1030	66
47	["Eitrigg", "Shu'halo"]	0	974	78
99	["Llane", "Arygos"]	0	967	59
75	["Argent Dawn", "The Scryers"]	0	951	69
1070	["Alexstrasza", "Terokkar"]	0	932	76
58	["Stormreaver"]	0	895	10
4	["Kilrogg", "Winterhoof"]	0	801	55
117	["Bronzebeard", "Shandris"]	0	799	70
120	["Darkspear"]	0	714	83
1072	["Ravencrest", "Uldaman"]	0	673	81
3207	["Goldrinn"]	0	669	75
1071	["Kirin Tor", "Steamwheedle Cartel", "Sentinels"]	0	657	74
3234	["Gallywix"]	0	249	82

EU

id	realmNames	popBlizz	popWoWProgress	rankWoWProgress
1403	["Draenor"]	3	31374	6
3391	["Silvermoon"]	3	29768	12
1084	["Dentarg", "Tarren Mill"]	3	27051	4
1305	["Kazzak"]	3	25593	3
3674	["Twisting Nether"]	3	22021	2
1390	["Hyjal"]	3	19283	20
3691	["Echsenkessel", "Blackhand", "Mal'Ganis", "Taerar"]	3	19201	10
1615	["Howling Fjord", "\u0420\u0435\u0432\u0443\u0449\u0438\u0439 \u0444\u044c\u043e\u0440\u0434"]	3	18798	1
1602	["Gordunni", "\u0413\u043e\u0440\u0434\u0443\u043d\u043d\u0438"]	3	14330	22
1379	["Zul'jin", "Uldum", "Sanguino", "Shen'dralar"]	3	14027	14
1329	["Ravencrest"]	3	13209	24
580	["Blackmoore", "Tichondrius", "Lordaeron"]	3	13169	13
3682	["Ragnaros"]	3	12438	9
3686	["Antonidas"]	3	12273	26
581	["Blackrock"]	3	11198	5
3702	["Argent Dawn"]	3	10195	25
604	["Thrall", "Kargath", "Ambossar"]	3	9972	16
1092	["Drak'thul", "Burning Blade"]	2	9256	8
3713	["Al'Akir", "Skullcrusher", "Xavius", "Burning Legion"]	2	8959	21
1621	["Marecage de Zangar", "Cho'gall", "Eldre'Thalas", "Sinstralis", "Dalaran"]	2	8337	27
2073	["Stormscale"]	2	8157	15
1335	["Ysondre"]	2	7127	11
1402	["Turalyon", "Doomhammer"]	0	6919	19
3692	["Eredar"]	2	6413	23
1604	["Soulflayer", "\u0421\u0432\u0435\u0436\u0435\u0432\u0430\u0442\u0435\u043b\u044c \u0414\u0443\u0448"]	2	5907	17
1597	["Auchindoun", "Dunemaul", "Sylvanas", "Jaedenar"]	2	5877	18
1096	["Scarshield Legion", "Sporeggar", "Earthen Ring", "Defias Brotherhood", "Ravenholdt", "Darkmoon Faire", "The Venture Co"]	2	5714	33
1303	["Grim Batol", "Aggra (Portugues)", "Frostmane"]	2	5539	30
1302	["Archimonde"]	2	5347	28
1587	["Hellfire", "Runetotem", "Arathor", "Kilrogg", "Nagrand"]	2	5291	36
1316	["Nemesis"]	1	4900	28
1378	["Dun Modr", "C'Thun"]	2	4868	42
1596	["Karazhan", "Dragonblight", "The Maelstrom", "Ghostlands", "Lightning's Blade", "Deathwing"]	2	4445	43
1127	["Confrerie du Thorium", "La Croisade ecarlate", "Culte de la Rive noire", "Les Sentinelles", "Kirin Tor", "Les Clairvoyants", "Conseil des Ombres"]	2	4407	31
1309	["Pozzo dell'Eternita", "Well of Eternity"]	0	4405	37
1396	["Quel'Thalas", "Azjol-Nerub"]	1	4263	38
633	["Kor'gall", "Executus", "Shattered Hand", "Bloodfeather", "Terokkar", "Saurfang", "Darkspear", "Burning Steppes"]	2	4081	32
3681	["Magtheridon"]	1	3505	45
1416	["Blade's Edge", "Eonar", "Vek'nilash", "Aerie Peak", "Bronzebeard"]	1	3407	69
1401	["Garrosh", "Shattrath", "Nozdormu", "Perenolde", "Teldrassil"]	2	3334	63
3656	["Spinebreaker", "Dragonmaw", "Vashj", "Stormreaver", "Haomarush"]	1	3297	7
1405	["Todeswache", "Zirkel des Cenarius", "Der Mithrilorden", "Forscherliga", "Der Rat von Dalaran", "Die Nachtwache"]	2	3163	40
1301	["Outland"]	2	3144	52
3690	["Khaz Modan"]	0	2830	67
1315	["Elune", "Varimathras"]	1	2812	44
1929	["Blackscar", "Deathweaver", "Borean Tundra", "Thermaplugg", "Grom", "Booty Bay", "\u041f\u0438\u0440\u0430\u0442\u0441\u043a\u0430\u044f \u0411\u0443\u0445\u0442\u0430"]	2	2804	51
1099	["Rexxar", "Alleria"]	1	2636	57
1122	["Uldaman", "Drek'Thar", "Krasus", "Eitrigg"]	1	2575	39
1098	["Malygos", "Malfurion"]	1	2523	46
3696	["Nethersturm", "Alexstrasza", "Madmortem", "Proudmoore"]	1	2512	68
1408	["Norgannon", "Dun Morogh"]	0	2503	53
2074	["Terenas", "Emerald Dream"]	0	2388	47
1105	["Nazjatar", "Zuluhed", "Dalvengyr", "Aman'Thul", "Frostmourne", "Anub'arak"]	1	2345	56
578	["Arthas", "Blutkessel", "Wrathbringer", "Durotan", "Kel'Thuzad", "Vek'lor", "Tirion"]	1	2329	58
3703	["Frostwolf"]	1	2210	35
612	["Nefarian", "Gilneas", "Destromath", "Ulduar", "Mannoroth", "Gorgonnash", "Nera'thor"]	1	2123	78
1598	["Shattered Halls", "Chromaggus", "Sunstrider", "Balnazzar", "Talnivarr", "Ahn'Qiraj", "Daggerspine", "Laughing Skull", "Trollbane", "Boulderfist"]	0	2121	55
1925	["Eversong", "\u0412\u0435\u0447\u043d\u0430\u044f \u041f\u0435\u0441\u043d\u044f"]	0	2019	84
570	["Lothar", "Baelgun", "Azshara", "Krag'jin"]	1	1993	48
1121	["Die Arguswacht", "Die ewige Wacht", "Die Todeskrallen", "Das Syndikat", "Der abyssische Rat", "Kult der Verdammten", "Das Konsortium", "Die Silberne Hand"]	1	1906	60
1313	["Wildhammer", "Thunderhorn"]	0	1883	70
3657	["Genjuros", "Zenedar", "Bladefist", "Neptulon", "Frostwhisper", "Darksorrow"]	0	1810	64
1307	["Chamber of Aspects"]	0	1786	75
509	["Garona", "Sargeras", "Ner'zhul"]	0	1692	34
1384	["Tyrande", "Los Errantes", "Colinas Pardas"]	1	1677	77
1104	["Anetheron", "Kil'jaeden", "Rajaxx", "Festung der Sturme", "Gul'dan", "Nathrezim"]	0	1619	50
512	["Arak-arahm", "Rashgarroth", "Kael'thas", "Throk'Feroth"]	0	1601	49
3666	["Shadowsong", "Aszune"]	0	1564	82
1325	["Aggramar", "Hellscream"]	0	1561	66
1614	["Galakrond", "Deepholm", "Razuvious", "\u0420\u0430\u0437\u0443\u0432\u0438\u0439"]	1	1542	76
1417	["Azuremyst", "Stormrage"]	0	1452	41
1388	["Lightbringer", "Mazrigos"]	0	1439	87
1928	["Goldrinn", "Lich King", "Greymane", "\u041a\u043e\u0440\u043e\u043b\u044c-\u043b\u0438\u0447"]	0	1400	61
1082	["Kul Tiras", "Alonsus", "Anachronos"]	0	1343	85
1385	["Exodar", "Minahonda"]	0	1294	90
1393	["Bronze Dragonflight", "Nordrassil"]	0	1255	54
1085	["Moonglade", "Steamwheedle Cartel", "The Sha'tar"]	0	1245	65
1406	["Arygos", "Khaz'goroth"]	0	1219	74
3679	["Aegwynn"]	0	1141	59
1400	["Un'Goro", "Sen'jin", "Area 52"]	0	1103	86
1080	["Khadgar", "Bloodhoof"]	0	1090	88
1097	["Ysera", "Malorne"]	0	1063	83
510	["Vol'jin", "Chants eternels"]	0	1010	79
1618	["Die Aldor"]	1	1008	71
1091	["Emeriss", "Twilight's Hammer", "Bloodscalp", "Crushridge", "Agamaggan", "Hakkar"]	0	972	80
1623	["Fordragon", "\u0414\u0440\u0430\u043a\u043e\u043d\u043e\u043c\u043e\u0440"]	0	876	91
1331	["Suramar", "Medivh"]	0	839	73
531	["Dethecus", "Theradras", "Onyxia", "Mug'thol", "Terrordar"]	0	805	72
1922	["Azuregos"]	0	781	62
1923	["Ashenvale", "\u042f\u0441\u0435\u043d\u0435\u0432\u044b\u0439 \u043b\u0435\u0441"]	0	622	81
1624	["Naxxramas", "Arathi", "Illidan", "Temple noir"]	0	448	89
1605	["Deathguard", "\u0421\u0442\u0440\u0430\u0436 \u0421\u043c\u0435\u0440\u0442\u0438"]	0	365	92