[2] The county was named for Edwin Waller, a signer of the Texas Declaration of Independence and first mayor of Austin.

Waller County is included in the Houston-The Woodlands-Sugar Land, TX metropolitan statistical area.

Igloo Corporation, a manufacturer of cooling and portable refrigeration products, is headquartered in unincorporated Waller County between Brookshire and Katy.

[12] In 2004, Igloo announced that it was consolidating its corporate, distribution, and manufacturing operations in Waller County.

13-CV-00193), pp 6–7 verbatim: In 2018, the NAACP Legal Defense Fund filed a lawsuit in U.S. district court, alleging that the county's early-voting plan unduly limits early voting opportunities for students at Prairie View A&M.

[18] On October 10, Jacob Aronowitz, a field director for Democratic U.S. House candidate Mike Siegel, delivered a letter from Siegel, which indicated a solution to attempts to keep students at Prairie View A&M University from voting, to a clerk on the county executive's staff.

[22] In November 2021, a 16 year old was charged with six counts of aggravated assault for crashing into six people on bicycles while attempting to roll coal.

[23][24] According to attorneys hired by the injured, the injuries included "broken vertebrae, cervical and lumbar spinal injuries, broken collar bones, hands, and wrists [requiring surgical intervention], multiple traumatic brain injuries, lacerations, soft tissue damage, road rash, and extensive bruising"[25] The Waller county district attorney, Elton Mathis, released a statement about the handling of the case by the Waller Police Department in which he said "This case was not handled appropriately by the investigating agency.

[27] Additionally, areas within Katy ISD are designated as the zone for Houston Community College.

[31] In addition William P. Hobby Airport in Houston and in Harris County has commercial airline service.