Czarnków-Trzcianka County (powiat czarnkowsko-trzcianecki) 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 is the town of Czarnków, which lies 61 km north-west of the regional capital Poznań. The county contains three other towns: Trzcianka, 18 km north of Czarnków, Krzyż Wielkopolski, 38 km west of Czarnków, and Wieleń, 27 km west of Czarnków.
The county covers an area of 1808.19 km2. As of 2006 its total population is 86,134, out of which the population of Trzcianka is 16,756, that of Czarnków is 11,356, that of Krzyż Wielkopolski is 6,283, that of Wieleń is 5,940, and the rural population is 45,799.
Czarnków-Trzcianka County is bordered by Wałcz County and Piła County to the north, Chodzież County to the east, Oborniki County and Szamotuły County to the south, Międzychód County to the south-west, and Strzelce-Drezdenko County to the west.
