Legality of Cannabis by U.S. Jurisdiction Pennsylvania portal1950s portalUnited States portalHistory portal This category is for topics specifically related to the year 1955 in the U.S. state of Pennsylvania. 19501951195219531954195519561957195819591960 1900s1910s1920s1930s1940s1950s1960s1970s1980s1990s2000s Subcategories This category has the following 4 subcategories, out of 4 total. / 1955 disestablishments in Pennsylvania (7 P) 1955 establishments in Pennsylvania (56 P)E 1955 Pennsylvania elections (2 P)S 1955 in sports in Pennsylvania (22 P)