This document offers a national picture of selected segments of the early care and education (ECE) market by describing how important attributes of the supply of and the demand for center-based care relate to each other. The document also provides a methodological guide for using newly available data from the National Survey of Early Care and Education (NSECE) to study local-level interactions of the supply of and demand for center-based early care and education (ECE) in the United States. For this brief the authors selected some center-based care variables characterizing the services provided to families, such as whether or not the care is full-time, whether or not parents pay for care, and whether or not infants and toddlers are served. Because of their policy relevance, they also included center-based variables that identify whether centers receive Head Start, Pre-K and/or child care subsidy (CCS) funding in order to characterize families' geographic accessibility to centers receiving public funding. The report notes a few limitations of this approach, for example, the substantial variation across clusters in the numbers of centers per cluster, and the square mileage covered by each cluster. The authors conclude with several suggestions for extensions to this approach, including incorporating a wider variety of center characteristics or home-based providers.