[3] The area around Porto Grande was first explored by gold miners, however nowadays it has become one of the biggest food producers in Amapá.

It is a poor region where many homes do not have sewage system, and a quarter of the population does not have access to clean drinking water, however Porto Grande has one of the lowest illiteracy rates of Brazil.

[5] The municipality contains 7.72% of the 2,369,400 hectares (5,855,000 acres) Amapá State Forest, a sustainable use conservation unit established in 2006.

[7] Porto Grande is a major fruit producer in particular pineapples and oranges.

Other economic activities are livestock like cattle, buffalo and pig, palm oil and pine plantations.