There are many people and places that welcome your service. You really can’t “volunteer” at a business that pays people to do the work, but you can volunteer at schools, non-profit organizations, and government agencies (like City of Mesa departments). Many faith-based organizations also sponsor service projects for their youth members such as participating in Amor Ministries which builds houses for those who really need them.
Below are choices to “Volunteer" this is a list of sites' that always need help and a “Help Now” list of projects in need of your help RIGHT NOW! These aren’t the only places you can volunteer, but they will give you a good start.