The strong NU and PKI votes in the two most populous provinces, East Java and Central Java, were decisive in giving those parties a powerful position in the new parliament. Map shows parties winning 5% or more of the vote, by province.
Feith, Herbert, The decline of constitutional democracy in Indonesia. Ithaca NY: Cornell University Press, 1962.
Herbert Feith, The Indonesian elections of 1955. Ithaca, NY: Cornell University Modern Indonesia Project, 1957.