Yu County
蔚县 | |
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 Location in Zhangjiakou City jurisdiction | |
  Yu County Location of the county seat in Hebei | |
| Coordinates: 39°50′N 114°34′E / 39.833°N 114.567°E | |
| Country | People's Republic of China |
| Province | Hebei |
| Prefecture-level city | Zhangjiakou |
| Seat | Yuzhou (蔚州镇) |
| Area | |
• Total | 3,183 km2 (1,229 sq mi) |
| Population (2020 census) | |
• Total | 411,824 |
| • Density | 130/km2 (340/sq mi) |
| Time zone | UTC+8 (China Standard) |
| Postal code | 075700 |
| Area code | 0313 |
| Website | www |
| Yu County, Hebei | |||||||||
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| Traditional Chinese | 蔚縣 | ||||||||
| Simplified Chinese | 蔚县 | ||||||||
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| Former names | |||||||||
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 A map of the commanderies of the Qin Empire, with Dai in the central north | |||||||||
| Dai Commandery | |||||||||
| Chinese | 代郡 | ||||||||
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| Dai County | |||||||||
| Traditional Chinese | 代縣 | ||||||||
| Simplified Chinese | 代县 | ||||||||
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Yu County, also known by its Chinese name Yuxian, is a county under the jurisdiction of the prefecture-level city of Zhangjiakou in northwestern Hebei province, China. Yuzhou town (蔚州镇) is the county seat.