Women make up a large proportion of undecided voters who are likely to vote. If either of the two leading parties is decisively successful in winning their support, they will be poised to form the next government.
For several years, the Polish parliament ignored requests from the National Electoral Commission to adjust voting districts to demographic changes. This failure gives disproportionate voting power to rural and small-town voters, many of whom support the ruling Law and Justice party.
Read how Poland's nationalist government has railed against EU asylum policy and migration from "culturally alien" countries but is, in fact, allowing thousands of Asian migrants in to keep the growing economy on track.