The Cleveland Metropolitan School District (CMSD) has seen the number of English learner students in grades K-12 increase in recent years, even as overall enrollment has decreased. In addition, the English learner student population has grown more diverse in race/ethnicity, country of origin, and native language. The increasingly diverse English learner student population requires more support from the district to meet broader needs for language, cultural, and educational assistance. The Cleveland Partnership for English Learner Success is a researcher-practitioner partnership between Regional Educational Laboratory Midwest and CMSD's Multilingual Multicultural Education Office and the district's research office. The partnership has prioritized examining the characteristics of English learner students and the schools they attend to identify which of those characteristics are associated with student achievement. The partnership undertook this research to help improve district and school supports for English learner students. The authors found the number of English learner students speaking languages other than Spanish increased. From 2011/12 to 2016/17 the percentage of students whose native language was Spanish decreased from 82 percent to 71 percent. During the same period the percentage whose native language was Arabic increased from 4 percent to 9 percent, and the percentage speaking an African language doubled from 5 percent to 10 percent. [SREE documents are structured abstracts of SREE conference symposium, panel, and paper or poster submissions.]