Knowing which cities have the most children can be helpful in searching for a place to live whether you have kids of your own or you would like to live in a place with less children. According to this map from AAAStateofPlay the number one US city with the most children is located in Texas. Laredo, Texas has 33% of its population under the age of 18. Roughly 84,000 children call Laredo their home. Even though they have the most children in the country, they don't even rank in the top 100 cities for raising children due to affordability and family fun scores on a study from WalletHub. On the opposite end with the lowest percentage (13.4%) of children living in the city is San Francisco, California. This may be due to the insane median house pricing in the city forcing larger families out or the homeless population that has become an alarming issue in the community.