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is a city in and the county seat of Upshur County, Texas, United States. The population was 4,799 at the 2000 census.
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.
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.