Below I have listed what my object countiespop returns as well as the type of the object. I cannot find a way to create a series of exclusively the 3 'STNAME'.
Name: CENSUS2010POP, dtype: int64
Is this what you are after?
#create a series using the index of the current Series pd.Series(countiespop.index) Out: 0 California 1 Texas 2 Illinois Name: a, dtype: object