Leavenworth County’s population grew by about 9.1% between 2000 and 2009 and continues to grow at a significant rate. A majority of residents are between the ages of 18 and 60 and are in their prime working years. Leavenworth County residents have a higher median income than the rest of the United States and are more prosperous than the average American.

Mid-America Regional Council projects that the county’s population will reach 83,000 by 2020.

  - Leavenworth County population is 74,276
  - The annual per household income is $58,850
  - Per capita income is $20,292
  - Median home value in Leavenworth County in 2007 was $161,300
  - The median age is 36
  - 86.5% of Leavenworth County residents have a high school education
  - 23.1% of Leavenworth County residents have a college degree

Approximately one-quarter (23%) of the working population earn an annual income between $50,000 and $75,000. Of the county population, 32% earn $75,000 or more annually. The median household income in Leavenworth County is approximately $55,000.