Population

The sim's population stems from the Sim Multiplier.

The Sim Multiplier is basically a number that you multiply by the number of playable sims to get your community's total population.

• All PLAYABLE sims count.  This means that townies and NPCs do not.  
• Servos count towards your sim multiplier.  
• Pets do not count toward the sim multiplier.  

So the formula would be... 

Sim Multiplier x Playable Sims = Populations

Sim Multiplier Points:  

• +1 for your first community lot
• +1 for your first total of 5 community lots
• +1 for every additional 5 community lots (after the first count)
• +5 for your business district
• +5 for your downtown
• +5 for your university
• +15 for your military base

Example:  If my hood has a total of 21 sims with 11 community lots and no subhoods, then my sim multiplier would be:

   1 for your first community lot
   1 for your first total of 5 community lots
+ 1 for every additional 5 community lots
   3 = Sim Multiplier

Sim Multiplier x Playable Sims = Population

3 x 21 = 63

My town would have a population of 63.