In American public schools, most racial and ethnic segregation—and most financial inequity—occurs between, not within, school districts, which is why cooperative interdistrict approaches are often the most effective at addressing these problems. Looking at three regions—Boston, MA; Hartford, CT; and Omaha, NE—the authors examine interdistrict desegregation designs that use innovative funding strategies to foster equity, quality, and access. They share academic and social outcomes and identifies lessons for policymakers.