Żerków is a town in Jarocin County, Greater Poland Voivodeship, Poland, with 2,122 inhabitants (2010). It is located 53 kilometres (33 mi) east of the regional capital of Poznań.

Greater Poland Voivodeship is a voivodeship, or province, in west-central Poland. It was created on 1 January 1999 out of the former Poznań, Kalisz, Konin, Piła and Leszno Voivodeships, pursuant to the Polish local government reforms adopted in 1998. The province is named after the region called Greater Poland or Wielkopolska. The modern province includes most of this historic region, except for some western parts.