Smith County is a county in the U.S. state of Texas. As of the 2020 census, its population was 233,479. Its county seat is Tyler. Smith County is named for James Smith, a general during the Texas Revolution.

Tyler is a city in and the county seat of Smith County, Texas, United States. As of 2020, the population is 105,995. Tyler was the 38th most populous city in Texas and 289th in the United States. It is the principal city of the Tyler metropolitan statistical area, which is the 198th most populous metropolitan area in the U.S. and 16th in Texas after Waco and the College Station–Bryan areas, with a population of 233,479 in 2020. The city is named for John Tyler, the tenth President of the United States.