Plachy-Buyon
Commune
The church in Plachy-Buyon
Coat of arms
Location of Plachy-Buyon
Plachy-Buyon Show map of France Plachy-Buyon Show map of Hauts-de-France
Coordinates: 49°48′59″N 2°13′11″E / 49.8164°N 2.2197°E / 49.8164; 2.2197
Country	France
Region	Hauts-de-France
Department	Somme
Arrondissement	Amiens
Canton	Ailly-sur-Noye
Intercommunality	CC Somme Sud-Ouest
Government
• Mayor (2020–2026)	Jean-Luc Huyon[1]
Area 1	10.13 km2 (3.91 sq mi)
Population  (2021)[2]	846
• Density	84/km2 (220/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
INSEE/Postal code	80627 /80160
Elevation	37–122 m (121–400 ft) (avg. 40 m or 130 ft)
1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries.

Plachy-Buyon (French pronunciation: [plaʃi bɥijɔ̃]; Picard: Plachy-Bion) is a commune in the Somme department in Hauts-de-France in northern France.

The commune is situated on the D8 road, some 8 miles (13 km) south of Amiens, in the valley of the Selle river, a tributary of the Somme. It is heavily influenced by the proximity of Amiens. 28% of the inhabitants are under the age of twenty.

• The new mairie, inaugurated on 14 October 2006.
• The old paper mill. Built around 1838–1844, on the site of an old watermill.
• Protected wooded valley site.
• The nineteenth century church of Saint-Martin.
• Traces of two Gallo-Roman villas.

• Communes of the Somme department