Spiro is located at (35.241464, -94.620717).
According to the United States Census Bureau, the town has a total area of 2.2 square miles (5.7 km²), of which, 2.1 square miles (5.5 km²) of it is land and 0.1 square miles (0.2 km²) of it (3.18%) is water.
There were 875 households out of which 30.6% had children under the age of 18 living with them, 47.0% were married couples living together, 15.8% had a female householder with no husband present, and 32.8% were non-families. 30.2% of all households were made up of individuals and 13.4% had someone living alone who was 65 years of age or older. The average household size was 2.46 and the average family size was 3.03.
In the town the population was spread out with 26.9% under the age of 18, 9.1% from 18 to 24, 26.6% from 25 to 44, 20.7% from 45 to 64, and 16.7% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 81.8 males. For every 100 females age 18 and over, there were 78.8 males.
The median income for a household in the town was $18,241, and the median income for a family was $25,556. Males had a median income of $23,716 versus $16,694 for females. The per capita income for the town was $11,195. About 23.2% of families and 29.3% of the population were below the poverty line, including 41.8% of those under age 18 and 29.9% of those age 65 or over.
On March 26, 1976 a tornado struck the town. It may have been an F-5 tornado. The damage path was about 1/4 of a mile. http://www.webspawner.com/users/spirotornado/index.html Spiro,Oklahoma F-5 Tornado Information Link.