New Johnsonville
- County:
- Humphreys County
- County Seat:
- No
- Area (mi²):
- 5.145
- State:
- Tennessee
New Johnsonville is a city located in Humphreys County, Tennessee. New Johnsonville has a 2026 population of 1,840. New Johnsonville is currently growing at a rate of 1.15% annually and its population has increased by 1.88% since the most recent census, which recorded a population of 1,806 in 2020.