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Kennewick, Washington
The Grassy Place
Location of Kennewick, Washington
Location of Kennewick, Washington
Country United States
State Washington
County Benton
 • Type Council-Manager
 • City 28.36 sq mi (73.45 km2)
 • Land 26.93 sq mi (69.75 km2)
 • Water 1.43 sq mi (3.70 km2)
407 ft (124 m)
 • City 73,917
 • Estimate 
 • Rank US: 429th
 • Density 2,744.8/sq mi (1,059.8/km2)
 • Urban
210,975 (US: 171th)
 • Metro
279,116 (US: 169th)
Time zone UTC-8 (Pacific (PST))
 • Summer (DST) UTC-7 (PDT)
ZIP codes
99336, 99337, 99338
Area code(s) 509
FIPS code 53-35275
GNIS feature ID 1512347

Kennewick is a city in Benton County in the southeastern part of the State of Washington, along the southwest bank of the Columbia River, just southeast of the confluence of the Columbia and Yakima rivers and across from the confluence of the Columbia and the Snake. It is the most populous of the three cities collectively referred to as the Tri-Cities (the others being Pasco across the Columbia and Richland across the Yakima). The population was 73,917 at the 2010 census. April 1, 2013 estimates from the Washington State Office of Financial Management put the city's population at 76,410.

The nearest commercial airport is the Tri-Cities Airport in Pasco, a regional commercial and private airport.


Kennewick Cable bridge Vietnam memorial
Cable Bridge, Lampson Corporate headquarters, and Tri-Cities Vietnam Memorial.

The name "Kennewick" is believed to be a native word meaning "grassy place." It has also been called "winter paradise," mostly because of the mild winters in the area. In the past, Kennewick has also been known by other names. Legend has it that the strangest was "Tehe," which has been attributed to the reaction from a native girl's laughter when asked the name of the region.

During the 1880s, steamboats and railroads connected what would become known as Kennewick to the other settlements along the Columbia River. In 1887, a temporary railroad bridge was constructed by the Northern Pacific Railroad connecting Kennewick and Pasco. That bridge could not endure the winter ice on the Columbia and was partially swept away in the first winter. A new, more permanent bridge was built in its place in 1888. Until this time, rail freight from Minneapolis to Tacoma had to cross the Columbia River via ferry.

In the 1890s, the Northern Pacific Irrigation Company installed pumps and ditches to bring water for agriculture into the Kennewick Highlands. Once there was a reliable water source, orchards and vineyards were developed all over the Kennewick area. Strawberries were another successful crop.

20th century to present

Kennewick was officially incorporated on February 5, 1904. In 1912, there was an unsuccessful bid to move the seat of Benton County from Prosser to Kennewick.

In 1915, Kennewick was connected to the Pacific Ocean with the opening of the Dalles-Celilo Canal.

In the prologue to World War II, the United States opened the Hanford nuclear site roughly nine miles northwest of Kennewick. Its purpose originally was to help produce nuclear weaponry, which the US was trying to develop. The plutonium refined there was used in the Fat Man bomb used to attack Nagasaki in 1945 in the decisive final blow of World War II. Many employees of that site then commuted from Kennewick. As the Hanford site's purpose has evolved, there has continually been a tremendous influence from the site on the workforce and economy of Kennewick.

In 1996, an ancient human skeleton was found on a bank of the Columbia River. Known as Kennewick Man, the remains are notable for their age (some 9,300 years). Ownership of the bones has been a matter of great controversy. After court litigation, a group of researchers were allowed to study the remains and perform various tests and analyses. They published their results in a book in 2014. A 2015 genetic analysis confirmed that this ancient skeleton was ancestral to Native Americans of the area (some observers had contended that the remains were of European origin.) The genetic analysis has notably contributed to knowledge about the peopling of the Americas.


Columbia River crossed by Cable Bridge, which connects Pasco (left) and Kennewick (right). Clover Island is visible on the right.

Kennewick lies along the Columbia River and the famous Lewis and Clark Trail marked during the 1804-1806 exploration of the newly acquired Louisiana Territory, reaching to the Pacific Coast.

Historic Downtown Kennewick, WA. Photo credit: Theresa Will

As of 2013, the historical downtown area is undergoing a rebirth. Historic buildings have been adapted to new uses and the compact, pedestrian-oriented area has attracted a diverse mix of businesses. These include a specialty gift boutique in a newly restored building, art galleries, wine bars and local breweries, upscale dining, and a full-service hardware center.

“Public artwork and recent streetscape improvements create a pleasing pedestrian environment. Through its efforts, the Historic Downtown Kennewick Partnership is creating new life for the commercial district while working to protect its pioneer heritage and historic buildings.”

The streets of downtown Kennewick are home to several bronze art sculptures.

Kennewick is the host city of the Tri-City Americans of the Western Hockey League and the Tri-City Outlaws of the United States Premier Hockey League. They both play their home games in the Toyota Center, which hosts many other regional events.

Every year during the summer, hydroplane racing takes place at the Water Follies event on the Columbia River. Residents from all of southeastern Washington come to Kennewick to shop in the city's commercial district, the center point of which is Columbia Center Mall.

Also, every year in August, the Benton-Franklin County Fair is held at the fairgrounds. Kennewick is the site of the annual Titanium Man (International Distance) and Plutonium Man (Half-Iron Distance) triathlons, attracting international contestants and observers.

See also: Columbia Park, Kennewick
Kennewick, WA WTC Memorial Monument
The World Trade Center Memorial Monument in Kennewick, Washington.
Photo credit: Dianna Martin
  • World Trade Center Memorial Monument:

A 9/11 – World Trade Center Memorial Monument is in its Southridge area. Kennewick is one of a few cities to have acquired an external vertical support column artifact salvaged from the World Trade Center. Lampson International worked in conjunction with the City of Kennewick and the Port Authorities of New York and New Jersey to facilitate the monument's fabrication. The central part of the monument is a 35-foot (11 m) twisted column of steel weighing nearly 6,000 pounds (2,700 kg).

The memorial site was dedicated on the 10th anniversary of the tragedy in memory of the 2,977 men and women who lost their lives on September 11, 2001. The memorial is located at the Southridge Sports Complex at the southern entrance to the City of Kennewick. The site includes landscaping and benches placed for reflection and contemplation, and a US flag above the steel monument.

Clover Island Lighthouse
Clover Island Lighthouse overlooking the Columbia River. Photo Credit: Brian Gomez
  • Clover Island:
See also: Clover Island

In May 2010, a 62-foot lighthouse was constructed on Clover Island (located on the Columbia River) in Kennewick. According to the Port of Kennewick, this is the first lighthouse since 1962 to be built in the United States, and the most recently constructed one in the state of Washington. The United States Coast Guard-approved lighthouse flashes a beacon every four seconds.

Clover Island is a 16-acre recreational destination near downtown Kennewick. It has restaurants, a hotel, and a yacht club, all enhanced by new public access for views of the river. By “constructing a gateway, pathway, lighthouse and public plaza on Clover Island, the Port of Kennewick created physical and visual access to the Columbia River and transformed a ‘distressed neighborhood’ into an urban waterfront destination.” Clover Island offers access to the beautiful scenery along the Columbia and continues to be a popular destination for recreation, wildlife viewing, and entertainment.


Richland Pasco Kennewick
The view from Badger Mountain in Richland looking toward south Richland (foreground), Kennewick (upper right) and Pasco (across the Columbia River). Taken in January, this photo does not show the spring flower display.

Kennewick is located 213 miles (343 km) east of Portland, Oregon and 225 miles (362 km) southeast of Seattle, Washington. As part of the Tri-Cities, Kennewick is part of the second largest metropolitan area in eastern Washington.

Kennewick is located at 46°12′13″N 119°9′33″W / 46.20361°N 119.15917°W / 46.20361; -119.15917 (46.203475, −119.15927).

According to the United States Census Bureau, the city has a total area of 28.36 square miles (73.45 km2), of which, 26.93 square miles (69.75 km2) is land and 1.43 square miles (3.70 km2) is water.


Kennewick has a semi-arid climate (Köppen BSk), that closely borders on a desert climate (Köppen BWk). Winters are chilly but not severe, with frequent light rainfall, and hot, very dry summers made tolerable by the low humidity. Snowfall is light owing to the influence of the Cascade rain shadow, and the city receives less than half the rainfall of Spokane and less than one-eighth as much as Astoria on the Pacific coast.

Climate data for Kennewick, Washington
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °F (°C) 68
Average high °F (°C) 40.4
Average low °F (°C) 28.0
Record low °F (°C) −19
Precipitation inches (mm) 1.08
Snowfall inches (cm) 4.4
Avg. precipitation days (≥ 0.01 inch) 9.6 7.8 7.9 5.5 5.3 4.4 2.5 2.7 3.5 4.9 8.9 9.3 72.3
Avg. snowy days (≥ 0.1 inch) 1.8 0.5 0.0 0 0 0 0 0 0 0 0.3 0.9 3.5


Historical population
Census Pop.
1900 183
1910 1,219 566.1%
1920 1,684 38.1%
1930 1,519 −9.8%
1940 1,918 26.3%
1950 10,106 426.9%
1960 14,244 40.9%
1970 15,212 6.8%
1980 34,397 126.1%
1990 42,155 22.6%
2000 54,693 29.7%
2010 73,917 35.1%
2015 (est.) 78,896 6.7%
U.S. Decennial Census
2015 Estimate

2010 census

As of the census of 2010, there were 73,917 people, 27,266 households, and 18,528 families residing in the city. The population density was 2,744.8 inhabitants per square mile (1,059.8/km2). There were 28,507 housing units at an average density of 1,058.6 per square mile (408.7/km2). The racial makeup of the city was 78.5% White, 1.7% African American, 0.8% Native American, 2.4% Asian, 0.2% Pacific Islander, 12.1% from other races, and 4.3% from two or more races. Hispanic or Latino of any race were 24.2% of the population.

There were 27,266 households of which 37.9% had children under the age of 18 living with them, 49.3% were married couples living together, 13.0% had a female householder with no husband present, 5.7% had a male householder with no wife present, and 32.0% were non-families. 25.7% of all households were made up of individuals and 8.8% 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 3.22.

The median age in the city was 32.6 years. 28.2% of residents were under the age of 18; 10.3% were between the ages of 18 and 24; 26.8% were from 25 to 44; 23.8% were from 45 to 64; and 10.9% were 65 years of age or older. The gender makeup of the city was 49.9% male and 50.1% female.

Sister cities

Kennewick has the following sister cities:

  • Republic of China Yingge, Taiwan
  • Republic of China Taoyuan District, Taiwan
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