Union Gap is a city in Yakima County, Washington, United States. As of the 2020 census, the city population was 6,568. Union Gap has become the retail hub for the entire Yakima Valley as a result of Valley Mall and other thriving businesses being located here. Part of the city is part of the Yakama Nation.

The town is so named due to the small Yakima River water gap with which it shares its name, in the east–west ranging hill-line at 46.529N, 120.472W. Through this gap proceeds US 97 & I-82, Thorp road, the Yakima river, and Ahtanum creek.

Union Gap is the namesake of Gary Puckett & The Union Gap, a nationally successful pop group of the late 1960s (Puckett grew up in the adjacent city of Yakima).

The city of Union Gap was originally named Yakima City and was officially incorporated on November 23, 1883. When bypassed by the Northern Pacific Railroad in December 1884, over 100 buildings were moved with rollers and horse teams to the nearby site of the depot. The new city was dubbed North Yakima. In 1918 North Yakima was changed to simply Yakima, and the original town to the south was named Union Gap.

Union Gap is located at 46°33′30″N 120°29′26″W / 46.55833°N 120.49056°W / 46.55833; -120.49056 (46.558237, -120.490566).

According to the United States Census Bureau, the city has a total area of 5.06 square miles (13.11 km), of which, 5.05 square miles (13.08 km) is land and 0.01 square miles (0.03 km) is water.

Liberty Bottleworks, a water bottle manufacturer, operates out of a plant in Union Gap that employs 18 people.

Historical population

Census	Pop.	Note	%±
1880	267		—
1890	196		−26.6%
1900	287		46.4%
1910	263		−8.4%
1920	332		26.2%
1930	586		76.5%
1940	976		66.6%
1950	1,766		80.9%
1960	2,100		18.9%
1970	2,040		−2.9%
1980	3,184		56.1%
1990	3,120		−2.0%
2000	5,621		80.2%
2010	6,125		9.0%
2020	6,568		7.2%
2022 (est.)	6,492		−1.2%
U.S. Decennial Census 2020 Census

As of the 2020 census, there were 6,568 people, 2,073 households in the city.

As of the 2010 census, there were 6,047 people, 2,061 households, and 1,420 families living in the city. The population density was 1,197.4 inhabitants per square mile (462.3/km). There were 2,173 housing units at an average density of 430.3 per square mile (166.1/km). The racial makeup of the city was 62.9% White, 0.9% African American, 2.6% Native American, 0.9% Asian, 29.1% from other races, and 3.6% from two or more races. Hispanic or Latino of any race were 47.2% of the population.

There were 2,061 households, of which 40.3% had children under the age of 18 living with them, 42.6% were married couples living together, 17.6% had a female householder with no husband present, 8.6% had a male householder with no wife present, and 31.1% were non-families. 23.5% of all households were made up of individuals, and 8.9% had someone living alone who was 65 years of age or older. The average household size was 2.90 and the average family size was 3.43.

The median age in the city was 32.7 years. 28.9% of residents were under the age of 18; 10.7% were between the ages of 18 and 24; 25.3% were from 25 to 44; 23.4% were from 45 to 64; and 11.8% were 65 years of age or older. The gender makeup of the city was 50.5% male and 49.5% female.

As of the 2000 census, there were 5,621 people, 2,070 households, and 1,407 families living in the city. The population density was 1,117.7 people per square mile (431.5/km). There were 2,210 housing units at an average density of 439.5 per square mile (169.6/km). The racial makeup of the city was 72.19% White, 0.41% African American, 2.24% Native American, 0.57% Asian, 0.09% Pacific Islander, 20.17% from other races, and 4.32% from two or more races. Hispanic or Latino of any race were 29.57% of the population.

There were 2,070 households, out of which 33.8% had children under the age of 18 living with them, 46.7% were married couples living together, 14.3% had a female householder with no husband present, and 32.0% were non-families. 26.0% of all households were made up of individuals, and 10.4% had someone living alone who was 65 years of age or older. The average household size was 2.67 and the average family size was 3.20.

In the city, the age distribution of the population shows 28.5% under the age of 18, 9.4% from 18 to 24, 28.4% from 25 to 44, 20.4% from 45 to 64, and 13.3% who were 65 years of age or older. The median age was 33 years. For every 100 females, there were 99.4 males. For every 100 females age 18 and over, there were 97.3 males.

The median income for a household in the city was $30,676, and the median income for a family was $34,795. Males had a median income of $25,802 versus $23,393 for females. The per capita income for the city was $13,102. About 14.9% of families and 18.0% of the population were below the poverty line, including 24.2% of those under age 18 and 9.9% of those age 65 or over.

• City of Union Gap Official Website
• History of Union Gap at HistoryLink
• Union Gap Tourism - the official tourism site for the City of Union Gap