According to the United States Census Bureau, the city has a total area of 30.0 square miles (77.6 km²), of which, 30.0 square miles (77.6 km²) of it is land and 0.03% is water.
There were 5,701 households out of which 33.4% had children under the age of 18 living with them, 41.9% were married couples living together, 22.2% had a female householder with no husband present, and 32.1% were non-families. 28.3% of all households were made up of individuals and 12.1% had someone living alone who was 65 years of age or older. The average household size was 2.52 and the average family size was 3.10.
In the city the population was spread out with 27.5% under the age of 18, 9.4% from 18 to 24, 26.7% from 25 to 44, 20.5% from 45 to 64, and 15.9% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 82.5 males. For every 100 females age 18 and over, there were 76.5 males.
The median income for a household in the city was $25,589, and the median income for a family was $31,316. Males had a median income of $27,946 versus $21,913 for females. The per capita income for the city was $13,734. About 20.3% of families and 23.6% of the population were below the poverty line, including 30.1% of those under age 18 and 27.3% of those age 65 or over.
The Grenada Adult Education Center (423 S. Line St., 662-227-6101) is the official GED testing center for Grenada County. They also offer free adult literacy, adult basic education, and GED-preparation services. The Center partners with the Grenada League for Adult Development (GLAD), the Grenada School District, and the Elizabeth Jones Library to use volunteers and community resources effectively to serve adult learners in Grenada County. Students should be at least 18 years old and officially withdrawn from K-12 school.