There are parish boundaries, but feel free to try out a variety of parishes . What to look for in a parish will depend on many personal factors. Then you might want to look for a parish with children's liturgies and a religious education program that will encourage you to participate in your child's religious formation. Maybe you'd like a multicultural parish with an emphasis on meeting the needs of the people in the community. Maybe you'd like the sense of family in a small parish, or you might prefer the anonymity of a large parish.
Some parishes offer Masses in other languages, even Latin.
If you're going back to your childhood parish, don't expect that things will be the same. Keep in mind that no parish will be perfect. There will always be things that you don't like. That's part of being human. But in every parish, you'll find the Mass, the Eucharist, the sacraments, and the Holy Spirit touching people's lives and showering them with love.