Lewis and Clark County GIS Maps

Lewis and Clark County Maps

The maps below show a few of the county map styles included in our downloads. County packages include map exports in JPEG, PNG, SVG, PDF and GeoTIFF formats plus more than 20 GIS layers for mapping, research and analysis. Available layers include zip codes, area codes, subdivisions, school districts, political boundaries, roads, water features, points of interest and more.

County packages also include historical county demographics, business intelligence, analytical dashboards, AI-ready prompts, markdown files and related reference data. Everything is organized to save hours of manual work collecting current data, cleaning it and joining it together. That makes it easier to move faster on analytics, due diligence, business planning and location research. Paid packages are built for commercial use, but some package contents include source-specific attribution or notice guidance. Review Licensing & Data Source Notices.

Lewis and Clark County Parcels

Lewis and Clark County has 39,901 mapped parcels covering 2,210,265 acres. The median assessed value is $364,087. The median lot size is 0.99 acres. 10,353 parcels are 10 acres or larger. Improved property accounts for 65.7% of parcels. Vacant land follows at 19.4% and exempt property at 10.3%. The records carry 28,273 distinct owner names. About 8% of parcels list an owner mailing address outside Montana. Owner names, mailing addresses, assessed values and lot sizes are on nearly every parcel. Site addresses reach 75.5%. Browse the interactive Lewis and Clark County Parcel viewer here.

Lewis and Clark County Parcel Data Coverage

Field coverage measured across all Lewis and Clark County parcel records. Download free sample data here.

Lewis and Clark County Population

Lewis and Clark County had 70,973 residents in 2020. That was 12% higher than in 2010. Lewis and Clark County added 15,257 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 21 people per square mile. Some of the county's most populated postal areas include Helena, Helena and East Helena.

Population Trend in Lewis and Clark County MT

Lewis and Clark County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.

Lewis and Clark County Zip Codes

Lewis and Clark County has 11 zip codes. Some of the county's most populated zip codes include Helena (59601), Helena (59602) and East Helena (59635). Helena is the largest zip by population, with about 30,848 residents or 43% of the county total. Together, the three largest zips account for about 96% of all county residents based on 2020 population estimates.

Most Populated Zip Codes in Lewis and Clark County MT

Lewis and Clark County Zip Code populations and trends per most recent census data.

Lewis and Clark County Demographics

Lewis and Clark County has a median age of 41.3, which makes the county a little older than Montana overall. About 21.4% of residents are under 18, while 19.9% are 65 or older. That gives the county a fairly even mix of younger families and older adults. The largest age group is 25 to 44 at about 30.9% of the population, which points to a solid working-age base. About 42.8% of adults have a bachelor's degree or higher, above the statewide figure of 34.5%. The county is mostly White by population, though Hispanic, Asian, Black and multiracial residents are also part of the local mix.

Key Demographics for Lewis and Clark County MT

Lewis and Clark County School Districts

Lewis and Clark County is served by 2 public school districts with 2,119 students enrolled in 2024. Several larger districts account for a substantial share of students across the county map area. Those three districts account for about 100% of public school enrollment in the map area. Total enrollment has grown modestly since 2017 across the districts shown on the county map.

Largest School Districts by Enrollment in Lewis and Clark County MT

Lewis and Clark County school district enrollment and trends per most recent NCES reporting data.

Lewis and Clark County Housing & Real Estate

Lewis and Clark County has a median home value of $358,200 and a median gross rent of $1,062. About 70% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run above the Montana median, while rents come in above the state average. In March 2026, the median listing price was $549,950 and homes spent about 57 days on the market.

Businesses in Lewis and Clark County, MT

Lewis and Clark County has 3,830 business listings across 658 categories. The largest categories in Lewis and Clark County business listings are Community & Nonprofits (79, 2.1%), Real Estate Agents (77, 2.0%), and Auto Repair (61, 1.6%). The full Lewis and Clark County business listings dataset includes names, categories, addresses and contact details where available. Lewis and Clark County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.

Top Business Categories in Lewis and Clark County, MT

Lewis and Clark County Business Listings

Lewis and Clark County business listings sourced from Overture Maps. Includes locations with a high level of confidence.

Lewis and Clark County Basemaps

Lewis and Clark County map and data packages include a set of useful basemaps to help you get started quickly. These include a custom light grey canvas, USGS topo, imagery and other reference layers that make it easier to build clear, meaningful county maps using the included GIS layers, your own data or both. Pre-rendered map tiles for the light grey basemap are included so you can use them offline or host them on your own CDN.

Preview a Live Package Demo

See exactly what is included in a county data package. Inspect how files are organized, the interactive data explorer and how maps and analytics are laid out. The demo loads a real sample package from Montana — explore the full structure before you buy.