Demography
As to ethnicity, Osek was traditionally a Czech settlement. Within Rokycany District Osek belongs among larger villages with population above 1,000. Thanks to relatively convenient location in proximity of region's major population centers (Rokycany, Plzeň) Osek's population is stable, even with slight trend towards growth.
Population of Osek:
| Year | 1890 | 1961 | 1970 | 1980 | 1991 | 2001 | 2007 |
| Population | 1,112 | 1,111 | 1,078 | 1,068 | 1,117 | 1,097 | 1,213 |
Read more about this topic: Osek (Rokycany District)