Guinea Grass is a village in the Orange Walk District of the nation of Belize. It is 38 metres above sea level. According to the 2000 census, Guinea Grass had a population of 2,510 people; by 2010 the census figures showed a population of 3,500. The population is made up of mostly Mestizos, Creoles, and East Indians. There are a number of Mennoniā¦Guinea Grass is a village in the Orange Walk District of the nation of Belize. It is 38 metres above sea level. According to the 2000 census, Guinea Grass had a population of 2,510 people; by 2010 the census figures showed a population of 3,500. The population is made up of mostly Mestizos, Creoles, and East Indians. There are a number of Mennonites, Taiwanese and other Central American immigrants living near or immediately in the village.