(Updated by Spikey on September 12th, 2009.)
If there are any unions that you're currently aware of that are eligible to be featured below, please drop a comment to help keep this list up-to-date.
For additional Top 25 Union lists, please visit Devvy01's blog.
#1: The Fighters Realm Union - 7835 [+84]
#2: The Xbox 360 Union - 6844 [+84]
#3: The Halo Union - 6651 [+29]
#4: The Legend of Zelda Union - 5720 [+36]
#5: PS3 - THE REAL NEXT GEN - 5642 [+64]
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#6: The HeadCrab Union - 4980 [+7]
#7: Final Fantasy Experience - 4766 [+73]
#8: Square Enix Experience - 4433 [+10]
#9: The Resident Evil Union - 3969 [+45]
#10: Garden of Gods - 3456 [+2]
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#11: video game lovers - 3349 [+7]
#12: The Emblems Union - 3314 [+53] 
#13: Reviewer's Legion - 3305 [+3] 
#14: Star Wars Union - 3213 [+31]
#15: Elder Scrolls Elite - 2842 [+28]
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#16: PSP Union - 2635 [+3]
#17: The Elder Scrolls Fan Union - 2509 [+4]
#18: The Overclocking & PC Tweaking Union - 2448 [+8]
#19: Evolution of Nintendo Union - 2435 [+0]
#20: The Family Guy Union - 2402 [-4]
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#21: Nintendo United - 2325 [+4]
#22: PS3 Union - 2314 [+15]
#23: The Metal Gear Solid Veterans Union - 2195 [+62]
#24: World Wrestling Everything - 2149 [+6]
#25: The GTA Legends Union - 2147 