|• Total||4.21 km2 (1.63 sq mi)|
|Elevation||138 m (453 ft)|
|• Density||800/km2 (2,100/sq mi)|
There are many theories about the parish's origin and its toponymic name, but most accept that the settlement was formed in the Middle Ages by a group of peasants from Santo Tirso. Arriving in an area full of wild chestnuts (the rebordão), the area began to be referred to as Rebordões.
Although not a citizen of the community, the celebrated painter Francisco José Resende (1825–1893) was known to have lived in the area of Santosinhos. Professor at the Academy of Arts in Porto (Portuguese: Academia de Belas Artes do Porto), he filled much of his artwork with scenes of the local community.
- Joaquim Ferreira da Silva (born 1916), lieutenant and military chaplain, born to a long line of religious families that included one bishop, four priests and four nuns, he received a military service medal, for his service in Portuguese India;
- Armindo Araújo (born 1 September 1977) is a rally driver, responsible for winning the Production World Rally Championship two successive years (2009–2010), becoming the first pilot to receive this honour since its creation in 2002.