Lewis County, Washington
A county in Washington, ranked 15 of 39 by population.
CountyFIPS 53041
- Population
- 88,062
- +5,511 (+6.7%) since 2020
- Land area
- 2,403
- square miles. A further 1.4% of the total area is water
- Population density
- 36.7
- people per square mile, computed rather than published
- County seat
- Chehalis
- Seat of county government.
- Established
- 1845
- 180 years ago
- Largest city
- Centralia city
- Population 19,375.
Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.
Satellite view
Aerial imagery of Lewis County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.
Where Lewis County ranks
Position among the 39 counties of Washington, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.
| Measure | Value | In Washington | Nationally |
|---|---|---|---|
| Population | 88,062 | 15th of 39 | 680th of 3,144 |
| Land area | 2,403 sq mi | 6th of 39 | 227th of 3,144 |
| Population density | 36.7 per sq mi | 21st of 39 | 1,757th of 3,144 |
| Median household income | $74,796 | 19th of 39 | 855th of 3,143 |
Full data for Lewis County
| Measure | Value | Source and vintage |
|---|---|---|
| Population | 88,062 | Vintage 2025 Population Estimates |
| Population in 2020 | 82,551 | Vintage 2025 Population Estimates |
| 2020 estimates base? | 82,144 | Vintage 2025 Population Estimates |
| Land area | 2,403 sq mi | 2025 Gazetteer Files |
| Water area | 33.6 sq mi | 2025 Gazetteer Files |
| Total area | 2,436 sq mi | 2025 Gazetteer Files |
| Population density? | 36.7 per sq mi | Computed: Vintage 2025 estimates divided by 2025 Gazetteer land area |
| Median household income | $74,796 | American Community Survey 2020-2024 5-Year Estimates |
| Median home value | $385,800 | American Community Survey 2020-2024 5-Year Estimates |
| Median age | 42.2 | American Community Survey 2020-2024 5-Year Estimates |
| Households | 32,916 | American Community Survey 2020-2024 5-Year Estimates |
| Housing units | 36,512 | American Community Survey 2020-2024 5-Year Estimates |
Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.
How the population changed
The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:
- Births minus deaths
- -124
- 926 births, 1,050 deaths
- Net migration
- +1,063
- More people moved in than moved out.
Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.
The 8 areas bordering Lewis County
Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.
| Bordering area | State | Shared border | Population |
|---|---|---|---|
| Yakima County | Washington | 48 mi | 259,185 |
| Thurston County | Washington | 48 mi | 304,261 |
| Cowlitz County | Washington | 47 mi | 114,885 |
| Pierce County | Washington | 42 mi | 946,288 |
| Skamania County | Washington | 35 mi | 12,669 |
| Pacific County | Washington | 29 mi | 24,357 |
| Grays Harbor County | Washington | 10 mi | 78,144 |
| Wahkiakum County | Washington | 6.7 mi | 4,873 |
Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.
All 39 counties of Washington
Open the interactive Washington county map, or jump straight to any of them.
- Adams County
- Asotin County
- Benton County
- Chelan County
- Clallam County
- Clark County
- Columbia County
- Cowlitz County
- Douglas County
- Ferry County
- Franklin County
- Garfield County
- Grant County
- Grays Harbor County
- Island County
- Jefferson County
- King County
- Kitsap County
- Kittitas County
- Klickitat County
- Lewis County
- Lincoln County
- Mason County
- Okanogan County
- Pacific County
- Pend Oreille County
- Pierce County
- San Juan County
- Skagit County
- Skamania County
- Snohomish County
- Spokane County
- Stevens County
- Thurston County
- Wahkiakum County
- Walla Walla County
- Whatcom County
- Whitman County
- Yakima County
Data on this page last rebuilt 30 August 2026. How these figures are produced.