Lewis and Clark County, MT Demographics
Lewis and Clark County, MT is the 6th most populous of 56 counties in Montana, with 70,973 residents across 3,458 square miles. That is about 21 people per square mile.
At the 2020 census
| Population | 70,973 |
|---|---|
| Land area | 3,458 sq mi |
| Density | 21 / sq mi |
Data: 2020 Census · American Community Survey 2024
How Lewis and Clark County compares to the US
We're computing this county's comparison table — check back shortly. Population, land area, and density above are already exact.
Central Location: Lewis and Clark County, MT
Measured from the county's main population center using 2020 census blocks.
We're computing the drive-time and radius areas around Lewis and Clark County, MT — check back shortly. Meanwhile you can drop a pin anywhere in the radius tool.
Census tracts in Lewis and Clark County, MT
| Name | Population | Sq mi | Per sq mi |
|---|---|---|---|
| Census Tract 12.01 | 7,030 | 25.4 | 276 |
| Census Tract 4 | 6,349 | 29.3 | 216 |
| Census Tract 2 | 5,916 | 437.1 | 14 |
| Census Tract 12.02 | 5,503 | 60.9 | 90 |
| Census Tract 7.02 | 5,043 | 2.6 | 1,918 |
| Census Tract 5.03 | 4,784 | 4.0 | 1,193 |
| Census Tract 5.01 | 4,415 | 8.0 | 552 |
| Census Tract 8 | 4,089 | 9.4 | 436 |
| Census Tract 10 | 3,988 | 4.7 | 851 |
| Census Tract 11.02 | 3,887 | 1.4 | 2,791 |
| Census Tract 9 | 3,814 | 1.1 | 3,382 |
| Census Tract 11.01 | 3,071 | 5.5 | 558 |
| Census Tract 3 | 3,026 | 729.9 | 4 |
| Census Tract 6 | 2,880 | 139.9 | 21 |
| Census Tract 5.04 | 2,862 | 1.2 | 2,340 |
| Census Tract 1 | 2,165 | 1,984.0 | 1 |
| Census Tract 7.01 | 2,151 | 13.8 | 155 |
Related places
Other counties nearby
Nearest counties
Metro areas containing Lewis and Clark County
About this page
This page shows demographics for a US county from the 2020 census and the American Community Survey: population, land area, density, urban share, and how the county compares to national averages for income, housing, age, and more.
Counties subdivide into census tracts, listed below with their populations. The drive-time and radius tables measure the population around the county's main population center.