Marmaduke is a city in Greene County, Arkansas, United States. The population was 1,111 in 2010.
Marmaduke is located in northeastern Greene County at 36°11′22″N 90°23′8″W / 36.18944°N 90.38556°W / 36.18944; -90.38556 (36.189365, -90.385661). U.S. Route 49 passes through the center of town, leading northeast 20 miles (32 km) to Piggott and southwest 11 miles (18 km) to Paragould, the Greene County seat. Arkansas Highway 34 crosses US 49 in the center of town; it leads east 5 miles (8 km) to Arkansas Highway 139 at Fritz and west 8 miles (13 km) to Lafe.
The city has a total area of 1.3 square miles (3.4 km), all land. Marmaduke is in the northern part of the Arkansas Delta physical region and sits just east of Crowley’s Ridge. The Missouri state line, following the St. Francis River, is 9 miles (14 km) to the east.
As of the 2010 United States Census, there were 1,111 people residing in the city. The racial makeup of the city was 96.5% White, 0.1% Native American, 0.1% Asian and 1.6% from two or more races. 1.7% were Hispanic or Latino of any race.
As of the census of 2000, there were 1,158 people, 487 households, and 323 families residing in the city. The population density was 871.6 people per square mile (336.2/km²). There were 528 housing units at an average density of 397.4 per square mile (153.3/km²). The racial makeup of the city was 96.80% White, 0.43% Native American, 0.09% Asian, 0.52% from other races, and 2.16% from two or more races. 0.78% of the population were Hispanic or Latino of any race.
There were 487 households out of which 32.4% had children under the age of 18 living with them, 53.2% were married couples living together, 10.5% had a female householder with no husband present, and 33.5% were non-families. 30.0% of all households were made up of individuals and 16.4% had someone living alone who was 65 years of age or older. The average household size was 2.34 and the average family size was 2.93.
In the city, the population was spread out with 25.2% under the age of 18, 7.7% from 18 to 24, 28.1% from 25 to 44, 22.5% from 45 to 64, and 16.6% who were 65 years of age or older. The median age was 36 years. For every 100 females, there were 85.6 males. For every 100 females age 18 and over, there were 84.3 males.
The median income for a household in the city was $23,300, and the median income for a family was $31,016. Males had a median income of $23,375 versus $19,432 for females. The per capita income for the city was $11,506. About 18.1% of families and 20.4% of the population were below the poverty line, including 24.8% of those under age 18 and 19.7% of those age 65 or over.