What is the population of Dewey County?

The population of Dewey County, SD is 5,789.

Where is Dewey County located?

Dewey County, SD is located at latitude 45.1566200 and longitude -100.8718600. It is in United States.

What is the area of Dewey County?

The area of Dewey County, SD is 6334 km².

What is the elevation of Dewey County?

Dewey County, SD has an elevation of 648 meters (2126 feet) above sea level.

What time zone is Dewey County in?

Dewey County, SD is in the America/Denver time zone.

How has the population of Dewey County changed?

The population of Dewey County, SD has increased from 5,301 (2010) to 5,789 (2020), a change of 9.2%.

Dewey County, South Dakota

Dewey County: county in South Dakota, United States of America

About

Dewey County is a county located in the U.S. state of South Dakota. As of the 2010 census, the population was 5,301 and a population density of 1 people per km². After 10 years in 2020 county had an estimated population of 5,789 inhabitants. Its county seat is Timber Lake. The county was created 143 years ago in 1882.

Dewey County locator map — Location of Dewey County on South Dakota map.

County Snapshot

Dewey County at a glance

Dewey County currently has 7 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.

South Dakota counties

Open related pages

Largest city

North Eagle Butte

Population 1,954

Quick Facts about Dewey County

Population	5,789 (2020)
Country	United States of America
State	South Dakota (United States)
Different from	Dewey, Dewey County
Area	6334 km²
Water as percent of area	5.8%
Land as percent of area	94.2%
Latitude & Longitude	45.1566,-100.8719
Capital	Timber Lake
Establishment	January 01, 1883
Time Zone	America/Denver
Local time	20:08:50 (16th April 2026)
Density	1 Pop. per km² as of 2020
Population growth	8.43% (2010-2020)
Weather	46℉ Mostly Clear 7-days weather

FOREST CITY BRIDGE DEWEY COUNTY SD image

Geography

Dewey County is located at 45°9'24"N 100°52'19"W (45.1566200, -100.8718600). It has 6 neighbors: Potter County, Walworth County, Corson County, Stanley County, Sully County and Ziebach County.

Dewey County map

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The largest city of Dewey County is Eagle Butte with a population of 1,418. Other cities include, Timber Lake population 491, Isabel population 150 and Firesteel population 35. See all Dewey County cities & populated places.

Dewey County Populated Places

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

City Name	Population	Title
North Eagle Butte	1,954	Census designated place in Dewey County, South Dakota, United States
Eagle Butte	1,418	City in Dewey and Ziebach counties in South Dakota, United States
Timber Lake	491	City in and county seat of Dewey County, South Dakota, United States
Virginia	292	Township in Union County, South Dakota
Isabel	150	Town in Dewey County, South Dakota, United States
Firesteel	35	Unincorporated community in South Dakota
Moreau	27	Township in Perkins County, South Dakota

Weather

46°F

Mostly Clear

18 mph SSE Overnight

Mostly clear. Low around 46, with temperatures rising to around 50 overnight. South southeast wind around 18 mph.

7-Day Forecast

Dewey County has 6 neighbours.

Potter County county in South Dakota, United States
Walworth County county in South Dakota, United States
Corson County county in South Dakota, United States
Stanley County county in South Dakota, United States
Sully County county in South Dakota, United States
Ziebach County county in South Dakota, United States of America

Timber Lake

Demographics

The population of Dewey County increased by 8.43% in 10 years.

Year	Population	% Change	Method
2010	5,301	-	census
2011	5,399	1.82%	estimation process
2012	5,534	2.44%	estimation process
2013	5,586	0.93%	estimation process
2014	5,668	1.45%	estimation process
2015	5,705	0.65%	estimation process
2016	5,785	1.38%	estimation process
2017	5,857	1.23%	estimation process
2018	5,925	1.15%	estimation process
2019	5,892	-0.56%	estimation process
2020	5,789	-1.78%	estimation process

Comitatul Dewey, Comte de Dewey, Comté de Dewey, Condado de Dewey, Condado han Dewey, Contea di Dewey, D'jui, Dewey, Dewey Kun, Dewey Kūn, Dewey konderria, Dewey maakond, Dewey megye, Djui, Dui srjan, Hrabstwo Dewey, Okrug Djui, Quan Dewey, Quận Dewey, de~yui jun, dirai ka'unti, du wei xian, mqatʿt dywy, shhrstan dywyy dakwtay jnwby, Дьюи, Дьюї, Дюи, Округ Дјуи, Դուի շրջան, شهرستان دیویی، داکوتای جنوبی, مقاطعة ديوي, ڈیوی کاؤنٹی, ڈیوی کاؤنٹی، جنوبی ڈکوٹا, ডিৱি কাউন্টি, デューイ郡, 杜威縣

Other places with the same name (1)

Dewey County, Oklahoma county in South Dakota, United States of America with a population of 4,815 people.

South Dakota Other Counties (more counties)

County Name	Population	Title
Minnehaha County	196,659	County in South Dakota, United States of America
Sioux Falls	157,584	The largest city in South Dakota.
Pennington County	115,926	County in South Dakota, United States of America
Rapid City	77,503	The second most populous city in South Dakota.
Lincoln County	63,019	County in South Dakota, United States
Brown County	38,738	County in South Dakota, United States
Brookings County	35,603	County in South Dakota, United States of America
Meade County	28,588	County in South Dakota, United States
Codington County	28,186	County in South Dakota, United States of America
Lawrence County	26,221	County in South Dakota, United States
Yankton County	22,742	County in South Dakota, United States
Watertown	22,303	City in and county seat of Codington County, South Dakota, United States
Davison County	19,812	County in South Dakota, United States of America
Beadle County	18,513	County in South Dakota, United States
Hughes County	17,336	County in Oklahoma, United States
Union County	16,192	County in South Dakota, United States