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- Paattinen – became part of the City of Turku in 1973
- Paavola – was consolidated with Revonlahti to form Ruukki in 1973
- Pargas – consolidated with Houtskär, Iniö, Nagu and Korpo to form Väståboland
- Pattijoki – became part of the City of Raahe in 2003
- Perniö – consolidated with Salo in 2009
- Pertteli – consolidated with Salo in 2009
- Peräseinäjoki and Seinäjoki consolidated to form the City of Seinäjoki in 2005
- Pernå – consolidated with Loviisa in 2010
- Petalax – consolidated with Malax in 1973
- Petsamo – was lost to the USSR in 1944
- Pieksämä – name of Pieksämäki in 1930–1948
- Pieksämäen maalaiskunta – consolidated with Jäppilä and Virtasalmi to form Pieksänmaa in 2004
- Pieksänmaa – became part of City of Pieksämäki in 2007
- Pielisensuu – became part of the City of Joensuu in 1954
- Pielisjärvi – became part of Lieksa in 1973
- Pietarsaaren maalaiskunta – Finnish name of Pedersöre until 1989
- Pihlajavesi – became part of Keuruu in 1969
- Piikkiö – consolidated with Kaarina in 2009
- Piippola – consolidated with Kestilä, Pulkkila and Rantsila to form Siikalatva in 2009
- Pohja – consolidated with Ekenäs and Karis to form Raseborg
- Pohjaslahti – consolidated partly with Vilppula and partly with Virrat in 1973
- Pohjois-Pirkkala – renamed as Nokia in 1938
- Porin maalaiskunta – became part of the City of Pori in 1967
- Pörtom – consolidated with Närpes in 1973
- Porvoon maalaiskunta and Porvoo formed the new City of Porvoo in 1997
- Purmo – became part of Pedersöre in 1977
- Pulkkila – consolidated with Kestilä, Piippola and Rantsila to form Siikalatva in 2009
- Purmo – consolidated with Pedersöre in 1977
- Pusula – was merged with Nummi to form Nummi-Pusula in 1981
- Pyhäjärvi Vpl – was lost to the USSR in 1944
- Pyhäjärvi Ol – renamed as Pyhäsalmi in 1993 and again as Pyhäjärvi in 1996
- Pyhäjärvi Ul – became part of Karkkila in 1969
- Pyhämaa – became part of the City of Uusikaupunki in 1974
- Pyhäsalmi – name of Pyhäjärvi in 1993–1996
- Pyhäselkä – consolidated with Joensuu in 2009
- Pylkönmäki – consolidated with Saarijärvi in 2009
- Pälkjärvi – was partially lost to the USSR in 1944, the rest was incorporated into Tohmajärvi in 1946
Read more about this topic: Former Municipalities Of Finland