Shamrock is an unincorporated community in Creek County, Oklahoma, United States. The population was 101 at the 2010 census, a loss of 19.2 percent from 125 at the 2000 census. It was named for Shamrock, Illinois, the hometown of local store owner, James M. Thomas.
Shamrock is located at 35°54′39″N 96°34′48″W / 35.91083°N 96.58000°W / 35.91083; -96.58000 (35.910737, -96.580131).
According to the United States Census Bureau, the town has a total area of 0.3 square miles (0.78 km), all of it land.
As of the census of 2000, there were 125 people, 47 households, and 29 families residing in the town. The population density was 379.2 people per square mile (146.3/km²). There were 70 housing units at an average density of 212.3 per square mile (81.9/km²). The racial makeup of the town was 89.60% White, 8.80% Native American, and 1.60% from two or more races. Hispanic or Latino of any race were 0.80% of the population.
There were 47 households out of which 31.9% had children under the age of 18 living with them, 48.9% were married couples living together, 10.6% had a female householder with no husband present, and 36.2% were non-families. 23.4% of all households were made up of individuals and 8.5% had someone living alone who was 65 years of age or older. The average household size was 2.66 and the average family size was 3.33.
In the town, the population was spread out with 35.2% under the age of 18, 4.0% from 18 to 24, 26.4% from 25 to 44, 20.0% from 45 to 64, and 14.4% who were 65 years of age or older. The median age was 35 years. For every 100 females, there were 104.9 males. For every 100 females age 18 and over, there were 92.9 males.
The median income for a household in the town was $21,250, and the median income for a family was $21,875. Males had a median income of $22,917 versus $15,000 for females. The per capita income for the town was $9,948. There were 20.6% of families and 29.5% of the population living below the poverty line, including 36.2% of under eighteens and 6.3% of those over 64.