The median age in Lee’s Summit is 38.8 years, according to the most recent Census Bureau estimates. That puts the city below Missouri’s statewide figure of 39.0 and below neighboring Cass County at 40.4, while sitting above Jackson County’s 37.0. Among the four figures, Lee’s Summit falls near the middle of the range.
Looking at the city’s own numbers over time, the median age was 37.2 years in the 2010–2014 period and 38.7 in the 2015–2019 period. The current estimate of 38.8 represents a change of plus 1.6 years from the earliest period shown — a shift the data identifies as statistically significant. The movement from 2015–2019 to the current period, a change of plus 0.1 years, falls within the margin of error and is treated as roughly flat.
For a city that has added population rapidly and draws many households at the family-formation stage, the median age has nudged upward over a decade while remaining below the statewide figure. The number is a count, not a verdict: it describes who is here on average, not where the city is headed.
These are 2020–2024 ACS 5-year estimates. Each figure carries a margin of error; the ladder above marks each ±MOE. Change figures compare non-overlapping five-year periods; the margin of error of a change combines both periods’ margins.