It’s just an estimate, but I counted* people in the Mojave, Gobi, and Sahara including those attempting to enjoy the set from outside each tent and here are my observations on how this year’s crowd differed from prior years. For a typical set at the day’s peak (assuming all 5 stages are going).
I’m happy to adjust my assumptions based your observations.
Gobi – 20% more crowded
5,000 people previously, 6,000 this year (+1,000)
Mojave: 13% more crowded
7,000 people previously, 8,000 this year (+1,000)
Sahara: No increase (but most volatile crowd size throughout the day)
7,000 people previously, 7,000 this year
Coachella Stage: No increase
24,000 people previously, 24,000 this year
Outdoor Theatre: 64% increase
14,000 people previously, 23,000 this year
Loitering, Eating, DooLabbing, Drinking, Camping, etc…: 57% increase
7,000 people previously, 11,000 this year
*It's not all that hard to count, considering there is a grid on the ceiling of each tent.