Warsaw
- County:
- Kosciusko County
- County Seat:
- Yes
- Area (mi²):
- 13.545
- State:
- Indiana
Warsaw is a city located in Kosciusko County, Indiana. Warsaw has a 2026 population of 16,111. It is also the county seat of Kosciusko County. Warsaw is currently declining at a rate of -0.06% annually but its population has increased by 1.92% since the most recent census, which recorded a population of 15,808 in 2020.