Time Trend of PTA Membership and Organizational Presence Source: Authors’ calculations updating Theda Skocpol’s data on PTA membership to 2017 and including organizational activity from the National Center for Charitable Statistics, Core and Business Master files. Time Trend of PTA Membership and Organizational Presence Source: Authors’ calculations updating Theda Skocpol’s data on PTA membership to 2017 and including organizational activity from the National Center for Charitable Statistics, Core and Business Master files. Brittany Murray et al. rsf 2019;5:41-63 © 2019 Russell Sage Foundation. Murray, Brittany, Thurston Domina, Linda Renzulli, and Rebecca Boylan. 2019. “Civil Society Goes to School: Parent-Teacher Associations and the Equality of Educational Opportunity.” RSF: The Russell Sage Foundation Journal of the Social Sciences 5(3): 41–63. DOI: 10.7758/RSF.2019.5.3.03. We thank Cole D. Smith for his support in matching nonprofit and school administrative data. We also thank William L. Pryor IV for generating maps of PTAs across North Carolina’s elementary schools. This material is based in part on work supported by the National Science Foundation under grant numbers SES-1626891. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. Direct correspondence to: Brittany Murray at bcmurray@live.unc.edu, 122 Peabody Hall, CB# 3500, Chapel Hill, NC 27599; Thurston Domina at tdomina@email.unc.edu, 119 Peabody Hall, CB# 3500, Chapel Hill, NC 27599; Linda Renzulli at lrenzull@purdue.edu, 700 W. State St., West Lafayette, IN 47907; and Rebecca Boylan at rboylan@purdue.edu, 700 W. State St., West Lafayette, IN 47907.