The author traces the development of low-incoming housing zones in the city of Nairobi (Kenya), which were initially shaped by the exclusive urban policies of the British Colonial Government, and further influenced by minimum standards codes established after Independence. Using a random sample of 1,480 heads of households, the author examines zones of entry into the city, with a view to identifying the residential patterns which low-income migrants establish in the process of becoming securely settled in the city. Three distinctive zones are identified, namely, the central, the intermediate, and the peripheral zones. The author offers several demographic.