Immigration enforcement and policy making has increasingly devolved to the local level in the United States. American sheriffs present a unique opportunity to evaluate decisions made about immigration policies in the local context. In dealing with immigration concerns in their counties, sheriffs act both within the confines of federal and state mandates and as local policymakers. However, little research comprehensively assesses the role sheriffs play in immigration policy making. Using data from an original, national survey of more than five hundred elected sheriffs in the United States, we provide a broad account of sheriffs’ roles in immigration enforcement and policy making. Our research demonstrates that sheriffs’ ideology and personal characteristics shape their personal attitudes about immigrants. In turn, these attitudes play a key role in influencing local enforcement decisions. Sheriffs’ immigration attitudes relate strongest to checks of the immigration status of witnesses and victims and those stopped for traffic violations or arrested for non-violent crimes. Our results demonstrate the important role of the sheriff in understanding local variation in immigration policy and the connection between the personal preferences of representatives and policy making that can emerge across policy environments and levels of government.