Voter file loaded June 5, 2026 · figures are from that file, held as a fixed record
Cowlitz County, Washington has 78,072 active registered voters across 91 precincts, as of July 2026.
Party registration
Washington doesn't register voters by party, so there's no party breakdown to show. Party lean is usually inferred from primary participation; that data is in the voter file and available inside Motion51.
How Cowlitz County voted for president
Election results are public records.
Cowlitz County at a glance.
Cowlitz County had an estimated 113,982 residents in July 2024, the 12th most populous of Washington's 39 counties, up 2.9% since the 2020 census. Of those, 88,798 are 18 or older, the voting-age population, and 20.5% are 65 or older. Its 78,072 active registered voters equal about 87.9% of that voting-age population.
It covers 1,141 square miles of land (100 people per square mile), and 44.7% of residents live outside any incorporated city or town. The largest cities and towns are Longview (38,294), Kelso (12,737), Woodland (part) (6,414), Kalama (3,131) and Castle Rock (2,445). The American Community Survey (2020-2024) puts it at a median age of 41.5, a median household income of $76,531, 17.6% of adults 25 and older holding a bachelor's degree or higher and 68.0% of occupied homes owned by the people living in them.
In 2024, 59,020 votes were cast for president, about 66.5% of the voting-age population; the Democratic ticket took 38.7% and the Republican ticket 58.6%. The two-party margin moved from D+11.2 in 2008 to R+19.9 in 2024.
- Population (2024 estimate)
- 113,982
- Population (2020 census base)
- 110,736
- Voting-age population (18+)
- 88,798
- Active voters per 100 adults
- 87.9
- Residents 65 and older
- 20.5%
- People per square mile
- 100
- Living outside incorporated places
- 44.7%
- Land area
- 1,141 sq mi
- Median age
- 41.5
- Median household income
- $76,531
- Adults 25+ with a bachelor's degree
- 17.6%
- Owner-occupied homes
- 68.0%
Largest cities and towns
- Longview 38,294
- Kelso 12,737
- Woodland (part) 6,414
- Kalama 3,131
- Castle Rock 2,445
Presidential vote, 2008–2024
| Year | Democratic | Republican | Margin | Votes cast |
|---|---|---|---|---|
| 2024 | 38.7% | 58.6% | R+19.9 | 59,020 |
| 2020 | 39.7% | 57.1% | R+17.4 | 60,280 |
| 2016 | 39.2% | 52.9% | R+13.7 | 45,485 |
| 2012 | 51.0% | 46.6% | D+4.4 | 40,976 |
| 2008 | 54.4% | 43.2% | D+11.2 | 45,229 |
Sources: U.S. Census Bureau Vintage 2024 population estimates and 2024 Gazetteer; American Community Survey 2020–2024 5-year estimates; certified county presidential returns. Growth, density and turnout are simple arithmetic on those figures.
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