There were 37,020 households out of which 42.10% had children under the age of 18 living with them, 64.80% were married couples living together, 11.00% had a female householder with no husband present, and 19.90% were non-families. 16.60% of all households were made up of individuals and 6.50% had someone living alone who was 65 years of age or older. The average household size was 2.96 and the average family size was 3.31.
In the county, the population was spread out with 30.20% under the age of 18, 9.30% from 18 to 24, 29.80% from 25 to 44, 21.50% from 45 to 64, and 9.20% who were 65 years of age or older. The median age was 33 years. For every 100 females there were 98.30 males. For every 100 females age 18 and over, there were 95.40 males.
The median income for a household in the county was $50,350, and the median income for a family was $55,358. Males had a median income of $37,613 versus $26,612 for females. The per capita income for the county was $20,212. About 6.80% of families and 8.60% of the population were below the poverty line, including 11.10% of those under age 18 and 10.40% of those age 65 or over.
Ellis is a staunchly Republican county in presidential elections. The last Democratic presidential candidate to carry the county was Jimmy Carter in 1976. Only three times since 1980 has the Republican candidate failed to gain more than two-thirds of the vote in Ellis County. In 2008, Republican John McCain won more than 70% of the vote in the county.
Donnie Fleeman professional light-heavyweight boxer, only Ellis County native to fight 3 world champion heavyweights; Sonny Liston, Ezzard Charles, and Muhammad Ali (formerly Cassius Clay). 47 national/international fights in his professional career. 37 wins, 22 KOs. Won State Heavyweight Title (Golden Gloves) in 1953 - contender for National Heavyweight Title, but lost to Sonny Liston. Cassius Clay (Muhammad Ali) was Fleeman's last professional fight, and took place in Miami, FL in 1961. This was Clay's 5th professional fight.