Great City School districts that have embraced the challenge of educating America's urban children have recognized the value of benchmarking their performance and growth against the progress of others. This report presents a number of different ways that member districts can analyze the data themselves by disaggregating results, showing trends, and combining variables. The 2021 report presents an updated set of data through school year 2019-20. This year, a companion online dashboard was released that added the ability to conduct several comparisons and analysis beyond what is presented in this report. This report focuses on the data collection and analysis of the following Academic Key Performance Indicators (KPIs): (1) Pre-K enrollment relative to Kindergarten enrollment; (2) Algebra I completion rates for credit by grade 9; (3) Ninth grade course failure rates -- at least one core course; (4) Ninth graders with B average (GPA) or better; (5) Absentee rates by grade level; (6) Suspension rates; (7) Instructional days missed per 100 students due to suspensions; (8) AP participation rates; (9) AP-equivalent participation rates; (10) AP exam pass rates; and (11) Four-year graduation rate. The analysis is divided into four sections: (1) elementary achievement indicators; (2) secondary achievement indicators; (3) attendance indicators; and (4) disciplinary indicators. [For the 2020 report, see ED610783.]