Tärnsjö
Tärnsjö  | |
|---|---|
| Coordinates: 60°09′N 16°56′E / 60.150°N 16.933°E | |
| Country | Sweden | 
| Province | Uppland | 
| County | Uppsala County | 
| Municipality | Heby Municipality | 
| Area | |
 • Total  | 1.89 km2 (0.73 sq mi) | 
| Population  (31 December 2020)  | |
 • Total  | 1,168 | 
| • Density | 620/km2 (1,600/sq mi) | 
| Time zone | UTC+1 (CET) | 
| • Summer (DST) | UTC+2 (CEST) | 
Tärnsjö is a locality situated in Heby Municipality, Uppsala County, Sweden, with 1,221 inhabitants in 2010.