Here is a little macro I've put together to give my toons all the Horde reps.
Delete the dividers and cut/paste into an open Hotkey on your keyboard.
Of course you'll need GM privileges to use this
Let me know if you want a similar list for the Alliance.
Horde macro - cut and paste remove dividers, their here for your viewing pleasure.
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/target player
/s .mod rep 1168 exalted 999 #Horde Guild
---------------Classic--------------
/s .mod rep 529 exalted 999 #Argent Dawn
/s .mod rep 910 exalted 999 #Brood of Nozdormu
/s .mod rep 609 exalted 999 #Cenarion Circle
/s .mod rep 909 exalted 999 #Darkmoon Faire
/s .mod rep 92 exalted 999 #Gelkis Clan Centaur (removed)
/s .mod rep 749 exalted 999 #Hydraxian Waterlords
/s .mod rep 93 exalted 999 #Magram Clan Centaur (removed)
/s .mod rep 349 exalted 999 #Ravenholdt
/s .mod rep 809 exalted 999 #Shen'dralar
/s .mod rep 59 exalted 999 #Thorium Brotherhood
/s .mod rep 576 exalted 999 #Timbermaw Hold
/s .mod rep 270 exalted 999 #Zandalar Tribe
---------------Horde----------------
/s .mod rep 1133 exalted 999 #Bilgewater Cartel
/s .mod rep 530 exalted 999 #Darkspear Trolls
/s .mod rep 1352 exalted 999 #Huojin Pandaren
/s .mod rep 76 exalted 999 #Orgrimmar
/s .mod rep 911 exalted 999 #Silvermoon City
/s .mod rep 81 exalted 999 #Thunder Bluff
/s .mod rep 68 exalted 999 #Undercity
-------------Horde Forces -------------
/s .mod rep 729 exalted 999 #Frostwolf Clan
/s .mod rep 510 exalted 999 #Defilers
/s .mod rep 889 exalted 999 #Warsong Outriders
-------------Steamwheedle Cartel--------
/s .mod rep 21 exalted 999 #Booty Bay
/s .mod rep 577 exalted 999 #Everlook
/s .mod rep 369 exalted 999 #Gadgetzan
/s .mod rep 470 exalted 999 #Ratchet
--------------Other------------------------
/s .mod rep 70 exalted 999 #Syndicate
/s .mod rep 1374 exalted 999 #Brawl'gar Arena
/s .mod rep 1375 exalted 999 #Dominance Offensive
/s .mod rep 1388 exalted 999 #Sunreaver Onslaught
/s .mod rep 1492 exalted 999 #Emperor Shaohao
/s .mod rep 589 exalted 999 #Winterspring Trainers
--------------Mists of Pandaria------------
/s .mod rep 1375 exalted 999 #Dominance Offensive
/s .mod rep 1269 exalted 999 #Golden Lotus
/s .mod rep 1271 exalted 999 #Order of the Cloud Serpents
/s .mod rep 1270 exalted 999 #Shado-Pan
/s .mod rep 1435 exalted 999 #Shado-Pan Assault
/s .mod rep 1388 exalted 999 #Sunreaver Onslaught
/s .mod rep 1341 exalted 999 #The August Celestials
/s .mod rep 1359 exalted 999 #The Black Prince
/s .mod rep 1337 exalted 999 #The Klaxxi
/s .mod rep 1345 exalted 999 #The Lorewalkers
---------------The Anglers---------------
/s .mod rep 1302 exalted 999 #The Anglers
/s .mod rep 1358 exalted 999 #Nat Pagle
---------------The Tillers---------------
/s .mod rep 1272 exalted 999 #The Tillers
/s .mod rep 1273 exalted 999 #Jogu the Drunk
/s .mod rep 1275 exalted 999 #Ella
/s .mod rep 1276 exalted 999 #Old Hillpaw
/s .mod rep 1277 exalted 999 #Chee Chee
/s .mod rep 1278 exalted 999 #Sho
/s .mod rep 1279 exalted 999 #Haohan Mudclaw
/s .mod rep 1280 exalted 999 #Tina Mudclaw
/s .mod rep 1281 exalted 999 #Gina Mudclaw
/s .mod rep 1282 exalted 999 #Fish Fellreed
/s .mod rep 1283 exalted 999 #Farmer Fung
--------------Cataclysm-----------------
/s .mod rep 1204 exalted 999 #Avengers of Hyjal
/s .mod rep 1172 exalted 999 #Dragonmaw Clan
/s .mod rep 1158 exalted 999 #Guardians of Hyjal
/s .mod rep 1178 exalted 999 #Hellscream's Reach
/s .mod rep 1173 exalted 999 #Ramkahen
/s .mod rep 1135 exalted 999 #The Earthen Ring
/s .mod rep 1171 exalted 999 #Therazane
-------------Wrath of the Lich King----------
/s .mod rep 1106 exalted 999 #Argent Crusade
/s .mod rep 1090 exalted 999 #Kirin Tor
/s .mod rep 1098 exalted 999 #Knights of the Ebon Blade
/s .mod rep 1156 exalted 999 #The Ashen Verdict
/s .mod rep 1073 exalted 999 #The Kalu'ak
/s .mod rep 1119 exalted 999 #The Sons of Hodir
/s .mod rep 1091 exalted 999 #The Wyrmrest Accord
/s .mod rep 1052 exalted 999 #Horde Expadition
/s .mod rep 1067 exalted 999 #The Hand of Vengeance
/s .mod rep 1124 exalted 999 #The Sunreavers
/s .mod rep 1064 exalted 999 #The Taunka
--------------Sholazar Basin--------------
/s .mod rep 1104 exalted 999 #Frenzyheart Tribe
/s .mod rep 1105 exalted 999 #The Oracles
--------------The Burning Crusade------------
/s .mod rep 1012 exalted 999 #Ashtongue Deathsworn
/s .mod rep 942 exalted 999 #Cenarion Expadition
/s .mod rep 989 exalted 999 #Keepers of Time
/s .mod rep 1015 exalted 999 #Netherwing
/s .mod rep 1038 exalted 999 #Ogrl'la
/s .mod rep 970 exalted 999 #Sporeggar
/s .mod rep 933 exalted 999 #The Consortium
/s .mod rep 941 exalted 999 #The Mag'har
/s .mod rep 990 exalted 999 #The Scale of the Sands
/s .mod rep 967 exalted 999 #The Violet Eye
/s .mod rep 947 exalted 999 #Thrallmar
/s .mod rep 922 exalted 999 #Tranquillien
---------------Shattrath City-----------------
/s .mod rep 1011 exalted 999 #Lower City
/s .mod rep 1031 exalted 999 #Sha'tari Skyguard
/s .mod rep 1077 exalted 999 #Shattered Sun Offensive
/s .mod rep 932 exalted 999 #The Aldor
/s .mod rep 934 exalted 999 #The Scryers
/s .mod rep 935 exalted 999 #The Sha'tar
This is a list of some of the factions and their Faction ID numbers. I've
marked some of the Alliance (A) only factions so you can start your own macro.
(A) Alliance Guild 1169
(H) Horde Guild 1168
Aldor 932
Argent Crusade 1106
Argent Dawn 529
Ashtongue Deathsworn 1012
Avengers of Hyjal 1204
Bilgewater Cartel 1133
Bloodsail Buccaneers 87
Booty Bay 21
Brood of Nozdormu 910
Cenarion Circle 609
Cenarion Expedition 942
Chee Chee 1277
Darkmoon Faire 909
Darkspear Trolls 530
(A) Darnassus 69
Defilers (AB Horde) 510
Dominance Offensive 1375
Dragonmaw Clan 1172
Ella 1275
Everlook 577
(A) Exodar 930
Farmer Fung 1283
Fish Fellreed 1282
Frostwolf Clan (AV Horde) 729
Gadgetzan 369
Gelkis Clan Centaur (Desolace) 92
Gina Mudclaw 1281
(A) Gnomeregan Exiles 54
Golden Lotus 1269
Guardians of Hyjal 1158
Haohan Mudclaw 1279
Honor Hold 946
Horde Expedition 1052
Huojin Pandaren 1352
Hydraxian Waterlords 749
(A) Ironforge 47
Jugo The Drunk 1273
Keepers of Time 989
Kirin Tor 1090
Kirin Tor Offensive 1387
Kurenai 978
League of Arathor (AB Alliance) 509
Lower City 1011
Magram Clan Centaur (Desolace) 93
Nat Pagle 1358
Netherwing 1015
Ogri'la 1038
Old Hillpaw 1276
Order of the Cloud Serpents 1271
Orgrimmar 76
Ramkahen 1173
Ratchet 470
Ravenholdt 349
Scryers 934
Sha'tar 935
Sha'tari Skyguard 1031
Shen'dralar (In Library of Dire Maul, North) 809
Shado-Pan 1270
Shado-Pan Assault 1435
Shadowsilk Poachers 449
Shadow Council Covert 988
Shadowmoon Shade 1026
Shattered Sun Offensive 1077
Sho 1278
Silvermoon City 911
Silverwing Sentinels (WSG Alliance) 890
Skettis Shadow Arakkoa 1034
Sunreavers Conversion 1155
Sunreaver Onslaught 1388
Spirits of Shadowmoon 1 1013
Spirits of Shadowmoon 2 1014
Sporeggar 970
(A) Stormpike Guard (AV Alliance) 730
(A) Stormwind 72
Syndicate 70
The Anglers 1302
The August Celestials 1341
The Black Prince 1359
The Consortium 933
The Earthen Ring 1135
The Hand of Vengeance 1067
The Klaxxi 1337
The Lorewalkers 1345
The Mag'har 941
The Oracles 1105
The Scale of the Sands 990
The Sons of Hodir 1119
The Sons of Lothar 940
The Sunreavers 1124
The Tillers 1272
The Violet Eye 967
The Wyrmrest Accord 1091
Therazane 1171
Thorium Brotherhood 59
Thrallmar 947
Thunder Bluff 81
Timbermaw Hold 576
Tina Mudclaw 1280
Tranquillien 922
Undercity 68
Warsong Outriders (WSG Horde) 889
(A) Wintersaber Trainers (Winterspring, Epic NE Land Mount) 589
Zandalar Tribe 270
Post if you want a more complete list including the Alliance rep macro
Cheers
Sandcrab