Jessa Farmer
Senior Research Analyst
Jessa.Farmer@klrd.ks.gov
785-296-4409
Jordan Milholland
Senior Research Analyst
Jordan.Milholland@klrd.ks.gov
785-296-3923
Andrew Finzen
Research Analyst
Andrew.Finzen@klrd.ks.gov
785-296-4407
The decennial Census provides states with the information to be used for the redistricting process, which entails the drawing of congressional, state House, state Senate, and State Board of Education districts.
Apportionment Data
According to the 2020 Census, Kansas has an unadjusted population of 2,937,880. This is an increase of 84,762 from the 2010 Census.
| Year | Unadjusted Population |
| 2000 | 2,688,418 |
| 2010 | 2,853,118 |
| 2020 | 2,937,880 |
Based on the 2020 Census, Kansas ranks as 35th for population among the states and the District of Columbia.
Kansas was previously ranked 33rd for population based on the 2010 Census. California is the most populous state at 39,538,223, and Wyoming is the least populous at 576,851.
Apportionment is the process of dividing the 435 seats in the U.S. House of Representatives among the states.
Based on the 2020 Census, five states gained one seat (Colorado, Florida, Montana, North Carolina, and Oregon) and one state (Texas) gained two seats. Additionally, seven states lost one seat (California, Illinois, Michigan, New York, Ohio, Pennsylvania, and West Virginia).
Kansas did not gain or lose a congressional seat, keeping its current four seats.
County Data
According to the 2020 Census, the three most populous counties in Kansas are Johnson with a population of 609,863, Sedgwick with a population of 523,824, and Shawnee with a population of 178,909.
The three least populous counties are Greeley with a population of 1,284, Wallace with a population of 1,512, and Lane with a population of 1,574.
The following page features a map that reflects population change in all Kansas counties from 2010 to 2020.
