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Map of Koka District with Meiji period (1890) area in yellow.

Kōka (甲賀郡, Kōka-gun) was a district located in Shiga Prefecture, Japan.

As of 2003, the district had an estimated population of 147,928 and a density of 267.90 persons per km². The total area was 552.18 km².

Towns and villagesEdit

Before the dissolution in 2004, the district had seven towns as listed below. Each municipality is now a part of the city noted in the parentheses.