Lewis and Clark County, MT Population

Overview

70,340

Total Population

40.9

Median age

50.17%

Female population %

99.3:100

Gender ratio (M:F)

55-59 years

Largest age group

58.2

Total dependency ratio

White

Largest racial group

2,538

Hispanic population

Sources: U.S. Census Bureau, American Community Survey (ACS) 2021

TABLE OF CONTENTS

Age

Lewis and Clark County's population is old compared to the rest of the country:

The median age in Lewis and Clark County is 40.9, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
Lewis and Clark County's population under 18 was 21.57%, compared to the 22.51% nationwide.
Lewis and Clark County's elderly or the senior population (over 65 age) was 18.86% as compared to 16.04% nationwide.
Of the total population in Lewis and Clark County, 17.92% were under the age of 15, 17.32% aged 15 to 29, 45.90% aged 30 to 64, 17.28% aged 65 to 84, and 1.58% were 85 years of age and older.

There are 242 more females than males in Lewis and Clark County:

The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 50.17% females and 49.83% males in Lewis and Clark County, MT.
The Lewis and Clark County, MT gender ratio is 99.3:100 i.e. 99.3 men to 100 women (0.993).
For male population, the largest age group is 55-59 years with a population of 2,667.
For the female population, the largest age group is 55-59 years with a population of 2,944.

Lewis and Clark County's population has become increasingly diverse:

Racial distribution of Lewis and Clark County population: 92.61% are White, 0.47% are Black or African American, 1.15% are American Indian and Alaska Native, 0.60% are Asian, 0.72% are some other race and 4.45% are multiracial.
Lewis and Clark County's racial breakdown clearly shows that there is an absolute majority of White population in the county.
By ethnicity, 2,538 is Hispanic or Latino (of any race), and 67,802 (96.39% of the total population) is Non-Hispanic.
The largest racial group in Lewis and Clark County is White with a population of 65,139 (92.61% of the total population).

Lewis and Clark County's population has not reached its peak yet and is showing a trend of further growth:

The peak population was 73,832 in the year 2022
From 2000 to 2010, Lewis and Clark County's population increased by 7,704 (13.79%), as compared to the national growth of 9.63%.
From 2010 to 2020, Lewis and Clark County's population increased by 7,590 (11.94%), according to Census Bureau's Population Estimates Program. For the same period, the rate of growth for the United States was 7.17%.
Between the year 2000 and 2022, Lewis and Clark County's population was lowest in year 2000 at 55,874.