As the nation’s leading federally funded early learning program, Head Start serves children and families in every state. Head Start’s role in each state differs based on local systems and models. The purpose of Head Start programs is to promote the school readiness of children ages 3 to 5 years. Most of these programs are based in centers. In other programs, children and families may receive services from educators and family service staff who regularly make home visits. Parent involvement is encouraged and support is offered for children with disabilities.