Guichen (French pronunciation: [ɡiʃɛ̃]; Breton: Gwizien; Gallo: Gischen) is a commune in the Ille-et-Vilaine department in Brittany in northwestern France.
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Inhabitants of Guichen are called Guichenais in French.
| Year | Pop. | ±% p.a. |
|---|---|---|
| 1968 | 3,311 | — |
| 1975 | 4,431 | +4.25% |
| 1982 | 5,311 | +2.62% |
| 1990 | 5,891 | +1.30% |
| 1999 | 6,526 | +1.14% |
| 2007 | 7,181 | +1.20% |
| 2012 | 7,797 | +1.66% |
| 2017 | 8,568 | +1.90% |
| Source: INSEE[3] | ||
| International | |
|---|---|
| National | |
| Other | |
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