The Oklahoma School Readiness Reach-by-Risk Report 2015 serves as the second publication in the series and updates data published in 2014. The Report is intended to provide policy makers and other early childhood education stakeholders with the most current data available on multiple school readiness risk factors across multiple domains, and the reach of services provided in each of the state?s 77 counties. This Report is a continued effort to highlight counties whose children are at the greatest risk of starting kindergarten unprepared to learn, and counties that are underrepresented in terms of quality early childhood education and child care services. This report is divided into two main sections, Risk and Reach. The Risk section consists of an analysis of nine socioeconomic and demographic indicators found by empirical research to increase a county's risk for poor school preparedness. The Reach section assesses the county-level service density of six early childhood programs and services designed to contribute to the cognitive and social-emotional development of young children. This Report provides current data on factors that place children at risk of being unprepared for school compared to the reach of several services and programs that promote school readiness. New for 2015 is the analysis of changes in risk and reach classifications between 2014 and 2015, including risk rank percentile changes. (author abstract)