Kościan County (Polish: powiat kościański) 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 Kościan, which lies 40 kilometres (25 mi) south-west of the regional capital Poznań. The county contains three other towns: Śmigiel, 13 km (8 mi) south-west of Kościan, Czempiń, 13 km (8 mi) north-east of Kościan, and Krzywiń, 18 km (11 mi) south-east of Kościan.
The county covers an area of 722.53 square kilometres (279.0 sq mi). As of 2006 its total population is 77,760, out of which the population of Kościan is 24,102, that of Śmigiel is 5,452, that of Czempiń is 5,135, that of Krzywiń is 1,547, and the rural population is 41,524.
Kościan County is bordered by Poznań County to the north, Śrem County to the east, Gostyń County to the south-east, Leszno County to the south, Wolsztyn County to the west and Grodzisk Wielkopolski County to the north-west.
Kościan [ˈkɔɕt͡ɕan] (German: Kosten) is a town on the Obra canal in west-central Poland, with a population of 23 952 inhabitants as of June 2014. Situated in the Greater Poland Voivodeship (since 1999), previously in Leszno Voivodeship (1975–1998), it is the capital of Kościan County. Polish nobleman Ignacy Wyssogota Zakrzewski was born nearby.
Kościan is twinned with:
Christ Church built in 1666
Christ Church built in 1666
Bent house at Masztalerza Street
Bent house at Masztalerza Street