Jarocin County is a unit of territorial administration and local government (powiat) in Greater Poland Voivodeship, west-central Poland. It came into being on January 1, 1999, as a result of the Polish local government reforms passed in 1998. Its administrative seat and largest town is Jarocin, which lies 63 kilometres (39 mi) south-east of the regional capital Poznań. The only other town in the county is Żerków, lying 12 km (7 mi) north of Jarocin.