Hi Motherofseven!

I think if you look in the 'Guides' section of the forums, almost any questions you have can be answered. But I since I am not sure about that specific question being in the guides I will tell you what I know if you begin highlighting here:

I believe the max population, after all collectibles are found is 115. Except in odd circumstances were a mother, at population 114, gets pregnant with twins or triplets making it possible to go to 116 or 117. I had that happen once. Also, certain island events could possibly push the number higher than 115. But generally speaking 115 is the number.
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I hope this helps! And I have to ask...are you really a mother of seven?