Lewis County Population

1820–2026

16,310

2026 projection

4.2% since 2020 (decrease)

05K10K15K20K25K1850190019502000

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 Lewis County. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
202616,310-840.51%
202516,394-840.51%
202416,478-1290.78%
202316,607-1130.68%
202216,720-1600.95%
202116,880-1410.83%
202017,021+1,1447.21%
201915,877-1040.65%
201815,981-1851.14%
201716,166-1240.76%

Showing 10 of 35 years.

Lewis County Demographics

43median age

Median age

Female44.4 yrs
Male41.6 yrs

Adults

13,104
3,528 seniors (65+) · 27% of adults9,576 other adults

Sex

Female 50% · 8,376Male 50% · 8,364

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 167 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

Lewis County Income

$56,477median household income

Median household income

$56,477

Half of households earn more, half earn less

Median earnings

$49,829

Typical yearly pay for a worker 25 or older.

Poverty rate

16.1%

About 1 in 6 residents

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

Lewis County Marital Status

53% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married53%53%53%
Never married26%30%22%
Divorced11%9%12%
Widowed10%7%13%
Separated<1%<1%<1%

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