Maybe 87% US, 10% CDN, and a few ROW ?

The frappr map probably gives a good summary, although it has been acting funny for me recently -- only showing one person per city/area.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8