According to the U.S. Census Bureau, the county has a total area of 637 square miles (1,649 km²), of which, 610 square miles (1,580 km²) of it is land and 27 square miles (69 km²) of it (4.17%) is water.
As of the census3 of 2000, there were 50,866 people, 18,471 households, and 13,373 families residing in the county. The population density was 83 people per square mile (32/km²). There were 20,507 housing units at an average density of 34 per square mile (13/km²). The racial makeup of the county was 50.91% White, 47.05% Black or African American, 0.24% Native American, 0.47% Asian, 0.02% Pacific Islander, 0.66% from other races, and 0.64% from two or more races. 1.42% of the population were Hispanic or Latino of any race.
There were 18,471 households out of which 37.40% had children under the age of 18 living with them, 45.80% were married couples living together, 21.30% had a female householder with no husband present, and 27.60% were non-families. 23.70% of all households were made up of individuals and 8.00% had someone living alone who was 65 years of age or older. The average household size was 2.72 and the average family size was 3.23.
In the county the population was spread out with 31.10% under the age of 18, 9.40% from 18 to 24, 29.10% from 25 to 44, 20.50% from 45 to 64, and 9.90% who were 65 years of age or older. The median age was 32 years. For every 100 females there were 91.00 males. For every 100 females age 18 and over, there were 85.00 males.
The median income for a household in the county was $30,109, and the median income for a family was $34,982. Males had a median income of $31,299 versus $21,783 for females. The per capita income for the county was $14,424. About 21.00% of families and 25.30% of the population were below the poverty line, including 35.30% of those under age 18 and 23.70% of those age 65 or over. Seventy-five percent of white socks sold in Arkansas are sold in Crittenden County.
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