Few elementary students on the Commonwealth of the Northern Mariana Islands (CNMI) are scoring at grade level or higher on the ACT Aspire reading assessment. To better understand factors associated with the reading proficiency of CNMI grade 3 students, stakeholders there asked the Regional Educational Laboratory Pacific to examine the demographic characteristics and education experiences of students who demonstrated reading proficiency by grade 3. The study focused on grade 3 students who were enrolled in CNMI public schools from 2014/15 to 2018/19. It found that female students, students who did not receive free or reduced-priced lunch, students who were older at the time of kindergarten entry, Filipino students, and students who did not change schools were more likely to demonstrate reading proficiency in grade 3 than other students. There was no difference in grade 3 reading proficiency between students who had enrolled in Head Start and students who had not. (author abstract)