Gilmer is located in Upshur County. About 4,843 people live here (as of 2020). Between 2010 and 2020, the population declined from 4,905 to 4,843. The region is at 112 meters above sea level. The area covers about 9.8 square kilometers. There are about 229 streets in Gilmer. The postal codes are 75644–75645. The dialing code is 903. Gilmer is city in and county seat of Upshur County, Texas, United States. Among other things, Gilmer has hotels, restaurants, supermarkets, clothing Stores, museums, schools, banks, hairdressers and pharmacies. More information at
www.gilmer-tx.com.