In this report we exploit newly available data from the National Survey of Early Care and Education (NSECE) to construct the first nationally representative estimates of all center-based care to children birth through age five years, not yet in kindergarten. We describe center-based early care and education (ECE) programs by such key characteristics as enrollment size, ages of children served, revenue sources, auspice and sponsorship and hours of operation. We also provide national estimates of total children enrolled in these programs. (author abstract)