Grant County is a county located on the northern border of the U.S. state of Oklahoma. As of the 2010 census, the population was 4,527. Its county seat is Medford. Originally designated as part of the Cherokee Outlet, it was named County L in Oklahoma Territory at the time of its opening to non-Indian settlement. A county election renamed it for U.S. President Ulysses S. Grant.
According to the U.S. Census Bureau, the county has a total area of 1,004 square miles (2,600 km), of which 1,001 square miles (2,590 km) is land and 2.7 square miles (7.0 km) (0.3%) is water. Most of the county is drained by the Salt Fork of the Arkansas River and its tributaries (Pond, Deer, Osage, and Crooked creeks). The Chikaskia River flows southeast from Kansas into the county’s northeastern corner, then crosses east into Kay County.
The county is by the U.S. state of Kansas on the north, specifically Sumner County, Kansas, and Harper County, Kansas. Adjacent counties in Oklahoma are Kay County to the east, Garfield County to the south, and Alfalfa County to the west.
As of the 2010 census, the county’s population was 4,527, a 12 percent decline from 5,144 at the 2000 census. The population density was 4.5 people per square mile (1.7/km²). There were 2,622 housing units at an average density of 3 per square mile (1/km²). More than 90 percent of residents self-identified as white. Less than 3 percent of residents self-identified as Native American and less than 2 percent self-identified as Hispanic or Latino of any race. Less than 1 percent of the population self-identified as Black or African American, Asian, or Pacific Islander. Less than 2 percent of the population self-identified as of a race not listed or as from two or more races.
There were 2,089 households out of which 30.7% had children under the age of 18 living with them, 60.4% were married couples living together, 6.3% had a female householder with no husband present, and 30.30% were non-families. 28.40% of households were made up of individuals and 15.8% had someone living alone who was 65 years of age or older. The average household size was 2.42 and the average family size was 2.95.
In the county, the population was spread out with 25.2% under the age of 18, 6.50% from 18 to 24, 24.10% from 25 to 44, 22.80% from 45 to 64, and 21.40% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 94.40 males. For every 100 females age 18 and over, there were 94.80 males.
The median income for a household in the county was $28,977, and the median income for a family was $35,833. Males had a median income of $26,837 versus $19,036 for females. The per capita income for the county was $15,709. About 10.50% of families and 13.70% of the population were below the poverty line, including 19.60% of those under age 18 and 11.90% of those age 65 or over.