There were 258,439 households, out of which 36.52% had children under the age of 18 living with them, 53.21% were married couples living together, 10.27% had a female householder with no husband present, and 33.05% were non-families. 26.12% of all households were made up of individuals, and 7.35% had someone living alone who was 65 years of age or older. The average household size was 2.55 and the average family size was 3.11.
In the district, the population distribution by age is 26.60% under the age of 18, 10.49% from 18 to 24, 31.65% from 25 to 44, 21.17% from 45 to 64, and 10.09% who were 65 years of age or older. The median age was 33.6 years. For every 100 females there were 95.78 males. For every 100 females age 18 and over, there were 92.54 males.
The median income for a household in the district is $51,118, and the median income for a family was $62,695. Males had a median income of $42,348 versus $30,353 for females. The per capita income for the district was $26,133. About 4.9% of families and 7.8% of the population were below the poverty line, including 8.7% of those under age 18 and 6.0% of those age 65 or over.
Among the population aged 16 years and older, 71.0% were in the civilian labor force and 0.1% were in the armed forces. Of the employed civilian workers, 12.8% were government workers and 5.6% were self-employed. Management, professional, and related occupations employed 41.5% of the workforce, and sales and office occupations an additional 28.8%. Only 0.2% were employed in farming, fishing, and forestry occupations. The largest employment by industry was: educational, health, and social services, 19.8%; professional, scientific, management, administrative, and waste management services, 12.0%; retail trade, 11.8%; and manufacturing, 10.4%. Agriculture, forestry, fishing and hunting, and mining industries only employed 0.4%.
The district's character is very different from the rest of Kansas, largely due to the influence of Kansas City and its suburbs. While Kansas's other congressional districts include significant rural territory, the 3rd is almost exclusively urban and suburban. As such, it is much friendlier to Democrats than the rest of the state. It was the only district in Kansas carried by Democrats in 2008, 2016, and 2020. The largest county, Johnson, has traditionally leaned Republican, though the brand of Republicanism practiced in the county has traditionally been a moderate one. The second-largest, Wyandotte, has long been one of the most Democratic counties in the state.
In recent years, as Eastern Kansas began to grow exponentially, the population has also increased, and has been voting more reliably Democratic. This led to Republican members of the Kansas House of Representatives and Kansas State Senate trying to gerrymander the district maps into reliably Republican, with growing fears that Democrats could win a second seat by 2026 if they did not take action. Several skewed maps were attempted to be passed, but were not able to be passed due to a veto from the Democratic governor Laura Kelly. A less aggressive map was passed by the Kansas Legislature after several maps were vetoed, but critics say this map split notably Democratic Wyandotte County and separates it from Shawnee County, a county more closer regionally and demographically to Wyandotte County, for the purpose of removing Rep. Sharice Davids from her seat in the House. Nevertheless, Davids carried the seat in 2022, after the map took effect.[citation needed]
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