Data from the 2020 decennial census released in September by the U.S. Census Bureau shows how residential populations within cities, school district boundaries and counties have changed over the last two decades. Local demographics have also changed as more residents have moved to the Tomball and Magnolia areas.

The number of residents in Montgomery County and the city of Magnolia have more than doubled since 2000 with the populations of every other locality growing at least 15% from 2010-20. As minority populations grew, the percentage of residents who are white declined from 2010-20 in each locality. In addition, Tomball ISD saw the greatest increase in the number of Black or African American residents, which nearly doubled in 10 years, although Black or African American residents made up 5.54% of the population in 2020. Magnolia and Magnolia ISD saw the greatest percentage-point increase in the percentage of residents who are Hispanic or Latino. As the total number of residents has grown, the number of Hispanic or Latino residents within each locality has also increased, more than doubling within the city of Magnolia and Tomball ISD from 2010-20.