Some theorists argue that cooperative intergovernmental relations are critical to policy implementation in the United States. This assertion is explored in the context of fair housing enforcement by comparing favorable administrative outcomes in fair housing complaints at the federal, state, and local levels from 1989 to 2004. What conclusions can be drawn from this systematic comparison of intergovernmental enforcement in one policy area over an extended period of time? First, cooperative federalism works well in fair housing enforcement. Second, of special significance, state civil rights agencies resolve complaints in favor of complainants nearly as often as the Department of Housing and Urban Development, and localities sometimes do so even more frequently.