East Mountain is a city in Upshur and Gregg counties, Texas, United States. The population was 899 at the 2020 census, an increase over the figure of 797 tabulated in 2010.

East Mountain is located in southeastern Upshur County. Small portions of the city extend south along Gilmer Road and Coulter Road into Gregg County. The city limits extend northwest along Main Street and Medlin Road as far as East Mountain, a 660-foot (200 m) wooded summit overlooking the community.

East Mountain is 10 miles (16 km) northwest of Longview and 7 miles (11 km) northeast of Gladewater.

According to the United States Census Bureau, the city has a total area of 2.0 square miles (5.3 km), of which 0.01 square miles (0.02 km), or 0.44%, are water.

Historical population

Census	Pop.	Note	%±
1980	855		—
1990	762		−10.9%
2000	580		−23.9%
2010	797		37.4%
2020	899		12.8%
U.S. Decennial Census

East Mountain racial composition as of 2020
(NH = Non-Hispanic)

Race	Number	Percentage
White (NH)	719	79.98%
Black or African American (NH)	15	1.67%
Native American or Alaska Native (NH)	5	0.56%
Asian (NH)	3	0.33%
Some Other Race (NH)	12	1.33%
Mixed/Multi-Racial (NH)	39	4.34%
Hispanic or Latino	106	11.79%
Total	899

As of the 2020 United States census, there were 899 people, 324 households, and 250 families residing in the city.

As of the census of 2000, there were 580 people, 229 households, and 174 families residing in the city. The population density was 285.5 inhabitants per square mile (110.2/km). There were 249 housing units at an average density of 122.6 per square mile (47.3/km). The racial makeup of the city was 94.14% White, 1.55% African American, 0.34% Native American, 0.17% Asian, 2.76% from other races, and 1.03% from two or more races. Hispanic or Latino of any race were 3.45% of the population.

There were 229 households, out of which 28.8% had children under the age of 18 living with them, 65.9% were married couples living together, 7.0% had a female householder with no husband present, and 24.0% were non-families. 20.1% of all households were made up of individuals, and 9.6% had someone living alone who was 65 years of age or older. The average household size was 2.53 and the average family size was 2.91.

In the city, the population was spread out, with 24.7% under the age of 18, 5.7% from 18 to 24, 25.5% from 25 to 44, 29.7% from 45 to 64, and 14.5% who were 65 years of age or older. The median age was 41 years. For every 100 females, there were 91.4 males. For every 100 females age 18 and over, there were 93.4 males.

The median income for a household in the city was $33,173, and the median income for a family was $38,068. Males had a median income of $32,500 versus $21,827 for females. The per capita income for the city was $14,701. About 7.5% of families and 10.3% of the population were below the poverty line, including 15.3% of those under age 18 and 3.3% of those age 65 or over.

Most of East Mountain is in the Gilmer Independent School District, but small portions of the town are also within the Union Grove and Longview Independent School Districts.