Gilmer is also the name of a county in West Virginia.

Gilmer is a town in and the county seat of Upshur County, Texas, United States. It is best known for being the birthplace of popular music singer Johnny Mathis. The population was 4,799 at the 2000 census. The town's namesake is a former United States Secretary of the Navy, Thomas Walker Gilmer.

Gilmer is located at 32°43'57" North, 94°56'49" West (32.732387, -94.946980).

According to the United States Census Bureau, the city has a total area of 4.6 square miles (12.0 km²), all of it land.

Four miles west of Gilmer is Lake Gilmer, which opened September 29, 2001

Gilmer is part of a larger area known as the "Piney Woods". The city and the surrounding area boasts a number of impressive specimens. The historic Trail of Tears came through this region, to this day arrow heads and other Native American artifacts can be found with little to no digging.

As of the census of 2000, there were 4,799 people, 1,926 households, and 1,300 families residing in the city. The population density was 1,038.5 people per square mile (401.1/km²). There were 2,214 housing units at an average density of 479.1 per square mile (185.0/km²). The racial makeup of the city was 75.91% White, 20.23% African American, 0.35% Native American, 0.08% Asian, 0.02% Pacific Islander, 1.90% from other races, and 1.50% from two or more races. Hispanic or Latino of any race were 4.42% of the population.

Texas (ⁱ/ˈtɛksəs/) (Alibamu: Teksi ) is the second most populous and the second most extensive of the 50 United States, and the most extensive state of the 48 contiguous United States. The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in East Texas. Located in the South Central United States, Texas shares an international border with the Mexican states of Chihuahua, Coahuila, Nuevo León, and Tamaulipas to the south, and borders the US states of New Mexico to the west, Oklahoma to the north, Arkansas to the northeast, and Louisiana to the east. Texas has an area of 268,820 square miles (696,200 km²), and a growing population of 25.7 million residents.

During the Spanish colonial rule, the area was officially known as the Nuevo Reino de Filipinas: La Provincia de Texas. Antonio Margil de Jesús was known to be the first person to use the name in a letter to the Viceroy of Mexico in July 20, 1716. The name was not popularly used in daily speech but often appeared in legal documents until the end of the 1800s.