Vaccine Facts and Policy catalogs selected immunization measures that influence the immunization environment in the fifty states, the District of Columbia, five immunization grantee cities (Chicago, Houston, New York City, Philadelphia, San Antonio) and eight U.S. territories (American Samoa, Guam, Republic of Marshall Islands, Federated States of Micronesia, Northern Mariana Islands, Palau, Puerto Rico, Virgin Islands). This website includes information about: