Cowlitz County Population

1860–2026

116.01K

2026 projection

4.5% since 2020 (increase)

020K40K60K80K100K120K186018801900192019401960198020002020

Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.

Use the left and right arrow keys to inspect population observations.

Population by year

Population estimates for Cowlitz County. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
2026116,006+1,1210.98%
2025114,885+1,1210.99%
2024113,764+8980.80%
2023112,866+8450.75%
2022112,021+3180.28%
2021111,703+6890.62%
2020111,014+6250.57%
2019110,389+1,7161.58%
2018108,673+1,8731.75%
2017106,800+2,0401.95%

Showing 10 of 31 years.

Cowlitz County Demographics

41.5median age

Median age

Female42.5 yrs
Male40.5 yrs

Adults

87,129
22,230 seniors (65+) · 26% of adults64,899 other adults

Sex

Female 50.1% · 56,283Male 49.9% · 56,077

Population by age

MaleFemale85+ years, male: 90785+ years, female: 1,35580–84 years, male: 1,11580–84 years, female: 1,48775–79 years, male: 2,10275–79 years, female: 2,09770–74 years, male: 3,25270–74 years, female: 3,45965–69 years, male: 3,12265–69 years, female: 3,33460–64 years, male: 3,92260–64 years, female: 4,23655–59 years, male: 3,48155–59 years, female: 3,34650–54 years, male: 3,45050–54 years, female: 3,35145–49 years, male: 3,34045–49 years, female: 3,31440–44 years, male: 3,76340–44 years, female: 4,25035–39 years, male: 3,29335–39 years, female: 2,68230–34 years, male: 3,75030–34 years, female: 3,73025–29 years, male: 3,44025–29 years, female: 3,36820–24 years, male: 3,09320–24 years, female: 2,79615–19 years, male: 3,31515–19 years, female: 3,41310–14 years, male: 3,69210–14 years, female: 3,8315–9 years, male: 3,7625–9 years, female: 3,1220–4 years, male: 3,2780–4 years, female: 3,11285+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–42K2K

Hover or tap an age group to see exact counts. Use the up and down arrow keys to inspect age groups.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101

Race and ethnicity

Tap a square or a group below to highlight it.

Each square is about 1% of residents (roughly 1,124 people).

Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002

Cowlitz County Income

$76,531median household income

Median household income

$76,531

Half of households earn more, half earn less

Median earnings

$51,452

Typical yearly pay for a worker 25 or older.

Poverty rate

12.2%

About 1 in 8 residents

U.S. Census Bureau, 2024 ACS 5-year estimates · Tables S1901, S1501, S1701

Cowlitz County Marital Status

50% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married50%51%49%
Never married29%33%25%
Divorced13%11%15%
Widowed7%4%9%
Separated2%1%2%

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201

Sources

8 sources, all from the U.S. Census Bureau

Population

American Community Survey, 2024 5-year