Exploring the critical role of school choice in the future of education reform, the Education Choice and Competition Index (ECCI) is an interactive web application that scores large school districts based on thirteen categories of policy and practice relevant to choice. The intent of the ECCI is to: create public awareness of the differences among districts in their support of school choice; provide a framework for efforts to improve choice and competition; and recognize leaders among school districts in the design and implementation of choice and competition systems. The 2013 ECCI reveals substantial year-to-year stability among districts in their commitment to and design of school choice. Thus the correlation between this year's and last year's aggregate district scores is 0.95. This stability is also evident in terms of the top-scoring districts. For 2013, just as for 2012, the top-scoring district nationally is the Recovery School District in New Orleans, which receives a score of 83 out of a possible 100 points on the ECCI. Although most districts marched in place in 2013, a few implemented new choice policies that moved their scores and ranks substantially. The most interesting among these is Denver, which moved from 24th to fifth place on the basis of a new unified choice system in which parents exercising school choice complete only one form on one timeline for all public schools, including every charter school in the district. [This report was written with Sarah Whitfield. For the 2012 report, see ED614744.]