Trivia: America’s most populous ZIP code belongs to Katy, a suburb of which city?
Houston, Texas
Seattle, Washington
Washington, D.C.
Denver, Colorado
The correct answer is Houston, Texas
So why is this answer correct? : The Texan ZIP code of 77449 has a population of 128,294 people and belongs to Katy, Texas, a suburb located 30 miles west of Houston. Interestingly, the second-most populated ZIP code in the country also belongs to Katy, with 118,291 residents living in the 77494 ZIP code. Five of the top 10 ZIP codes by population are located in the Lone Star State.