|Intercommunality||Pays de Quintin|
|Elevation||147–322 m (482–1,056 ft)|
|Land area1||21.87 km2 (8.44 sq mi)|
|- Density||45 /km2 (120 /sq mi)|
|INSEE/Postal code||22099/ 22800|
|1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km² (0.386 sq mi or 247 acres) and river estuaries.|
|2 Population without double counting: residents of multiple communes (e.g., students and military personnel) only counted once.|
Inhabitants of Lanfains are called lanfinois in French.
The highest point in the commune at 323 m is situated at Bel Air-Porpaire. This makes Lanfains one of the highest communes in Btittany, the church standing at an altitude of 310 m.
The parish of Lanfains was first mentioned in 1428.
A wind farm was installed in the commune in 2005.
Agriculture represents the main economic activity of the commune. It is essentially geared to husbandry of cattle, poultry and pigs and polyculture. The area of the commune is 2,187 hectares. Two food industry entreprises are present : the LDC abattoir and the Armoricaine dairy. Artisan work is represented by a roofer, a plumber, a sawmill, a fish farmer, and a milk factory. There are several commercial firms in the commune : a café and a bar alimentation, a crêperie, a garage, a public works firm and a poultry transporter.
- Saint-Guyganton church - built 1717 and restored in 1845.
- Le Pas (with space for free time, lake, camping and chapel, crossed by the Saint-Brieuc-Loudéac railway, the former foundry-forge of Le Pas which was active from 1828 to 1978)
See also 
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