Runover Cities

Runover Cities are cities primarily consiting of Raiders and the Rotten. They are cities that when you enter them you practically immediately gain the Rot due to the large number of the Rotten there. Any chance of creating a refugee camp there is 0%, but these places are also a breeding ground for Raiders and Looters. Since the majority of people can't live in these cities, that leaves more resources for Raiders and Looters to thrive on. All of the Eastern Coast of the United States and primarily in Florida and New England is completely filled with the Rotten.
 * All of Solana, Contra Costa, Almaeda, San Francisco and San Mateo Counties
 * Portland
 * Seattle
 * Vancouver
 * Albuquerque

Most European Cities due to the fact that most that most cities are based around high density unlike the urban sprawl of the US which only increases the likelyhood of disease and spread of it.

Tokyo is often referenced by Seagull as a Raider and Looter's dream city due to the sheer size of it and density of population, most Eastern Asian Cities follow this as well, but Tokyo has the largest Metro area out of all of them.