Of course all of these places existed before the 1950s. In the sense that the land didn't just spring out of the waters then or that it wasn't some sort of remote pioneer or Indian country.

But, for the most part, these were small towns and rural areas before the '50s. There was some exurban development along the old streetcar lines, and especially some suburban development along the Woodward corridor up to Royal Oak. The rest was relatively lightly populated semi-rural area though. Even significant areas of the City of Detroit were not fully developed until WWII and shortly afterwards.

In any event, other than small cities like Pontiac and Mt. Clemens [[the respective county seats of Oakland and Macomb counties), none of those areas have any history at all as a city. They were first small towns surrounded by farmland near Detroit, then suburbs of Detroit.