Several charts and tables were created using Sept. 4, 2025 voter registration data from the Kansas Secretary of State.
In the most recent voter file Kansas dropped to have just under 2 million voters.
Please give comments or ask questions in the discussion at the bottom of the article.
Age by Year
This histogram was created by computing voter age in years (rounded) based on the Nov. 4, 2025 election day and a voter’s date of birth, and counting the number of voters for each age.
Each blue vertical bar represents the number of Kansas voters for ages 18 to 105.
Age and Gender
The US Census provides population estimates by 5-year age intervals, which is useful for comparison against voter age intervals. (A special 18-19 two-year interval was also created to cover all voting ages. )
So, let’s combine the 1-year counts above to 5-year interval counts below, but also break the counts by gender.
The number of registered voters not specifying a gender has grown in recent years. But these numbers are relatively small compared with the male-female gender counts above, so they are shown in a separate chart below.
Major Political Parties
The following shows separate histograms by age and gender for the major Kansas political parties, Democratic and Republican, as well as those not affiliating with any party (“Unaffiliated”).
Democratic
Republican
Unaffiliated
Minor Political Parties
The Libertarian Party has been active in Kansas for many years, but two new “minor” political parties were created in 2024, “No Labels” and “United Kansas.”
The party membership of these two new parties is fairly small.
Libertarian
No Labels
United Kansas
Census Comparisons
The voter counts for the five-year age intervals can be compared with five-year US Census estimates in their American Community Survey.
New 5-year estimates from the American Community Survey are expected late this year, which will be used in a future update.
These registered voter count comparisons against census estimates are not super precise but should show trends, patterns and issue in the data.
Age Interval
Intervals for 65 years old and above show 100% or higher voter participation compared with census estimates. This reflects “bloat” in the voter file for these age intervals caused mostly by inflexible federal laws about voter list maintenance.
Most “inactive” voters have no valid mailing address.
How to interpret bar
Table of data
Age Interval and Gender
Here’s a breakdown of the plot above by gender.
Note the female-male census bars for age intervals from 18-19 through 55-59 show more males than females, yet there are more registered females than males in all those intervals.
Overall, the census estimates suggest about 5,000 more females than males of voting age in Kansas, but females have a sizable lead of about 87,500 registered voters over males.
Thank you for bring us this info.