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Since 1980 all of Philadelphia’s coins, except the cent, receive the “P” mint mark.
In 1979, the Susan B. Anthony dollar coin was introduced. Once again, the “P” mint mark appeared. The following year, the “P” appeared on all of the denominations except the cent, which still holds true today.
Since all the other mints were using mint marks it was not considered that Philadelphia should or needed to use one. This began to change in 1979, with the Susan B. Anthony dollar being the first coin to bear the “P” mint mark. The next year (1980), the “P” was added to all denominations except for the cent.