Clarkston is a city in Asotin County, Washington, United States.

[5] Clarkston's ZIP code, 99403, is the highest numerically in the contiguous United States.

[9] Directly east across the Snake River is Lewiston, named for Meriwether Lewis and the larger and older of the two cities.

The expedition passed westbound through the area by canoe in 1805 on October 10; neither Lewis nor Clark ever visited the Clarkston side of the river.

Clarkston is in the Lewis-Clark Valley, at the confluence of the Snake and Clearwater rivers.

[10] This region experiences hot and dry summers, with average monthly temperatures in the upper-80s to mid-90s, but some days reach 105 °F (41 °C).

The Port of Clarkston is home to one of the largest cranes on a navigable waterway east of Portland.

Agriculture is a major industry in the area and the port handles a lot of barge traffic carrying grains.

The port's marina has accommodations for personal boats and yachts, many of which travel through the nearby Hells Canyon.

It has a library, a football field, a performing arts stage, and a tennis court.

Clarkston is also home to Holy Family Catholic School, serving grades K–8.