Lebanon
- County:
- Grafton County
- County Seat:
- No
- Area (mi²):
- 40.305
- State:
- New Hampshire
Lebanon is a city located in Grafton County, New Hampshire. Lebanon has a 2026 population of 15,389. Lebanon is currently growing at a rate of 0.35% annually and its population has increased by 7.56% since the most recent census, which recorded a population of 14,308 in 2020.