Prior scholarship has established that controlling space is central to policing, while highlighting various ways in which this form of social control can be racialized. Extending this work, we advance a theory on the racialized control of space that predicts a higher level of police stops and lower standards of suspicion along neighborhood racial boundaries, the areas where racial composition changes between adjacent neighborhoods. Our theoretical argument sheds light on the selective enforcement of law and order in these transitional spaces, which is a form of racialized spatial social control. Integrating data from New York City’s Stop, Question, and Frisk program from 2008 to 2012 with extensive neighborhood measures, our analyses reveal that White neighborhoods along boundaries experienced substantially elevated levels of police stops even after conditioning on a wide array of potential confounders. This relationship is partially mediated by elevated crime along neighborhood racial boundaries. Still, a sizable direct effect persists, indicative of the racialized social control of spaces. Further, the police tended to require less suspicion before deciding to conduct stops in White neighborhoods along racial boundaries, but only for Black and Hispanic suspects. Implications for the study of race and policing, law and society, and urban and racial inequality are discussed.