What is the population of Columbia County?

The population of Columbia County, WA is 4,048.

Where is Columbia County located?

Columbia County, WA is located at latitude 46.2975500 and longitude -117.9078800. It is in United States.

What is the area of Columbia County?

The area of Columbia County, WA is 2262 km².

What is the elevation of Columbia County?

Columbia County, WA has an elevation of 802 meters (2631 feet) above sea level.

What time zone is Columbia County in?

Columbia County, WA is in the America/Los_Angeles time zone.

How has the population of Columbia County changed?

The population of Columbia County, WA has decreased from 4,078 (2010) to 4,048 (2020), a change of -0.7%.

Columbia County, Washington

Columbia County: county Washington, United States

About

Columbia County is a county located in the U.S. state of Washington. As of the 2010 census, the population was 4,078 and a population density of 2 people per km². After 10 years in 2020 county had an estimated population of 4,048 inhabitants. Its county seat is Dayton. The county was created 151 years ago in 1874.

Columbia County locator map — Location of Columbia County on Washington map.

County Snapshot

Columbia County at a glance

Columbia County currently has 1 quality-checked populated place pages linked on MapSof, making it easier to jump from the county overview into local city pages.

Browse county places

Mapped populated places

These counts use a stricter populated-place filter so the main lists stay focused on real city and town pages.

Washington counties

Open related pages

Largest city

Starbuck

Population 130

Quick Facts about Columbia County

Population	4,048 (2020)
Country	United States of America
State	Washington (United States)
Different from	Columbia County, Columbia County, Columbia County, Columbia County, Columbia County, Columbia County, Columbia County
Area	2262 km²
Water as percent of area	0.6%
Land as percent of area	99.4%
Latitude & Longitude	46.2976,-117.9079
Named for	Columbia River
Capital	Dayton
Establishment	January 01, 1875
Time Zone	America/Los_Angeles
Local time	16:15:27 (18th April 2026)
Density	2 Pop. per km² as of 2020
Population growth	-0.74% (2010-2020)
Weather	66℉ Partly Sunny 7-days weather

Map of Washington highlighting Columbia County locator map image

Geography

Columbia County is located at 46°17'51"N 117°54'28"W (46.2975500, -117.9078800).

Columbia County map

Click "full screen"

icon to open full mode. View satellite images

The largest city of Columbia County is Starbuck with a population of 130. . See all Columbia County cities & populated places.

Columbia County Populated Places

Cities, towns, neighborhoods & other populated places in Columbia County.

City Name	Population	Title
Starbuck	130	Town in Columbia County, Washington, United States

Weather

66°F

Partly Sunny

7 mph S Today

Partly sunny, with a high near 66. South wind around 7 mph.

7-Day Forecast

Official website of Columbia County

Official Website

Dayton

Demographics

According to census records, the population of Columbia County decreased by 0.74% in 10 years.

Year	Population	% Change	Method
2010	4,078	-	census
2011	4,005	-1.82%	estimation process
2012	3,977	-0.7%	estimation process
2013	4,002	0.62%	estimation process
2014	3,985	-0.43%	estimation process
2015	3,960	-0.63%	estimation process
2016	3,975	0.38%	estimation process
2017	4,002	0.67%	estimation process
2018	4,039	0.92%	estimation process
2019	3,985	-1.36%	estimation process
2020	4,048	1.56%	estimation process

Columbia, Columbia Kun, Columbia Kūn, Columbia konderria, Columbia megye, Comitatul Columbia, Comte de Columbia, Comté de Columbia, Condado de Columbia, Condado han Columbia, Contea di Columbia, Hrabstwo Columbia, Kantono Columbia, Kolumbija, Okrug Kolambija, Quan Columbia, Quận Columbia, ge lun bi ya xian, kalambiya ka'unti, koronbia jun, mqatʿt kwlwmbya, shhrstan klmbya washyngtn, Колумбия, Колумбія, Округ Коламбија, شهرستان کلمبیا، واشینگتن, مقاطعة كولومبيا, کولمبیا کاؤنٹی، واشنگٹن, কলম্বিয়া কাউন্টি, コロンビア郡, 哥倫比亞縣

Other places with the same name (7)

Columbia County, Georgia county in Oregon, United States with a population of 160,377 people.
Columbia County, Florida county in Florida, United States with a population of 72,654 people.
Columbia County, Pennsylvania county in Pennsylvania, United States with a population of 64,842 people.
Columbia County, New York county in New York, United States with a population of 59,534 people.
Columbia County, Wisconsin county in Wisconsin, United States with a population of 57,668 people.
Columbia County, Oregon county in Oregon, United States with a population of 52,876 people.
Columbia County, Arkansas county in Arkansas, United States with a population of 23,331 people.

Washington Other Counties (more counties)

County Name	Population	Title
King County	2,274,315	County in the state of Washington, United States
Pierce County	913,890	County in the state of Washington, United States
Snohomish County	830,393	County in the state of Washington, United States
Seattle	769,714	The eighteenth most populous city in the United States and the center of the Seattle metropolitan area.
Spokane County	528,225	County in the state of Washington, United States
Clark County	496,865	County in Washington, United States
Thurston County	294,074	County in the state of Washington, United States
Kitsap County	272,787	County in the state of Washington, United States
Yakima County	251,879	County in the state of Washington, United States
Whatcom County	231,016	County in the state of Washington, United States
Spokane	222,050	The second most populous city in Washington.
Tacoma	219,945	The third most populous city in Washington.
Benton County	206,426	County in Arkansas, United States
Vancouver	186,192	The third most populous city in Washington.
Bellevue	148,073	The most populous city in Washington.
Skagit County	130,789	County in the state of Washington, United States