[6][7] Barrios (which are, in contemporary times, roughly comparable to minor civil divisions)[8] in turn are further subdivided into smaller local populated place areas/units called sectores (sectors in English).

At the time of the Spanish arrival the area was under control of cacique (tribal chief) Caguax, from whom the city of Caguas gets its name.

The first European settlement in the area was the Hato de Bairoa, a cattle farm established and developed between the years 1525 and 1600.

During this time the economy of the barrio was primarily the cultivation of sugarcane and minor fruits, and cattle raising.

[20] According to the 2010 United States Census the population of Bairoa is of 19,258 residents, and the barrio today is primarily suburban and residential.