Jarocin County (powiat jarociński) 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 km south-east of the regional capital Poznań. The only other town in the county is Żerków, lying 12 km north of Jarocin.
The county covers an area of 587.7 km2. As of 2006 its total population is 70,390, out of which the population of Jarocin is 25,834, that of Żerków is 2,058, and the rural population is 42,498.
Jarocin County is bordered by Środa Wielkopolska County and Września County to the north, Pleszew County to the east, Krotoszyn County to the south, and Gostyń County and Śrem County to the west.
