The official languages of Costa Marila is Ibero (irl Spain mixed with Portuguese, Italian, Latin and English), which is the lingua franca for all Costamarilan. Other official language is Austral (irl English). Most of the Costamarilan is White people called Iberos (irl. Spanish/Spaniard) who settled this regions from about 16th century, sailing from the coast of Ibera (irl. Iberia) to search for another habitable land. They arrived from east at the Ponto Nevo (currently Bajamos) then settle this place and establish a colony here.

Recognized languages including Barjo (irl Mapuche), spoken by the native Barjese who lives along the southern coast and mostly lived in Cordilera region, especially along the eastern mountains near the border (Serra Silvana), where their ancestor's land lies. They lives nomadenly, scatter across the country as a trader with their national animal called Jirapa (irl. Llama)

Nagalanese Gangos (irl Nagaland Hindi), spoken by Nagalanese and Assamese around the border mountains, they mostly work as a local trader.

Sanis is spoken by Ubesii people at northern border, and Austral is mostly spoken by Cordian who lives in south and populated many urban areas here.