TESTFor the purpose of legislation regulating their municipal affairs, the exercise of certain corporate powers, and having respect to the number, character, powers, and duties of certain officers thereof, the cities now in existence and those hereafter created in this Commonwealth shall be divided into four classes:
Those containing a population of one million or over shall constitute the first class.
Those containing a population of two hundred and fifty thousand and under one million shall constitute the second class.
Those containing a population of eighty thousand and under two hundred and fifty thousand and which by ordinance elect to be a city of the second class A shall constitute the second class A.
Those containing a population under two hundred and fifty thousand and which have not elected to become a city of the second class A shall constitute the third class.
53 P.S. § 101