I checked on my village this morning and found that my population was at 91. I am sure that it is kind of a computer glich that happened because the game or computer was trying estimate what had happened overnight, but I wanted to ask a few questions just in case.
1) Has this happened to other people and if so how many villagers did you end up with?
2) Does this mean that my poplulation will always be able to go up to 91 people or once someone dyes will I be limited to 90 again?
3) Has the population limit been raised? If so what is the new limit?
These aren't uber-important questions or anything. I am just curious about what may have happened to others.

Maximum population will all the collectables is 115 and without 90.

To explain your 91 population one of your villagers must off had twins and 89 population or twins at 88 population.

If you need anymore information feel free to Private message me.

To answer the other question, your population will still be limited to 90. You will not be able to have another baby until the population drops back to 89 or below. However, as keza ere says, you can increase your maximum population by completing a set or sets of collectibles.