Cryptsy  1114 votes      https://www.cryptsy.com/coinvotes/
Hitbtc     2192 votes     https://hitbtc.com/vote
Bter         1 vote          https://bter.com/voting
cex.io      17 votes         https://support.cex.io/hc/communities/public/questions/203157458-Please-add-NEM-to-cex-io   (just register and vote)