Sanctuary Ordinances fills a critical void in our knowledge of the treatment of immigrants in the U.S. This book assesses the response to in-migration in over 3,000 U.S. counties and focuses on county level data, an important unit of analysis for understanding government, law enforcement and citizen responses to immigrants. The use of mixed methods is one of the many strengths of this work, and the book focuses both on historical and contemporary pressures on the decisions to be a “welcoming” or “exclusionary” jurisdiction. This is a must-read for those who study criminal justice, as much of the responsibility for responding to the challenges of immigration is left to fall on the criminal justice system.