 Examples of class or income segregation in the United States can be seen by comparing poverty rates in the central city and the suburbs in the West, the South, the Northeast, and the Midwest.The Northeast and the Midwest have more restrictive anti-density regulations.The lower incidence of poverty in the cities of the West and South and the higher incidence in the suburbs are associated with their more relaxed anti-density regulations 

Jonathan Rothwell has argued that zoning encourages racial segregation.