Jefferson County GIS Maps

Jefferson 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.

Jefferson County Parcels

Jefferson County has 13,061 mapped parcels covering 1,055,754 acres. The median assessed value is $124,132. The median lot size is 9.32 acres. 6,367 parcels are 10 acres or larger. Improved property accounts for 45.3% of parcels. Vacant land follows at 32.2% and exempt property at 14.7%. The records carry 7,036 distinct owner names. About 10% 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 61.7%. Browse the interactive Jefferson County Parcel viewer here.

Jefferson County Parcel Data Coverage

Field coverage measured across all Jefferson County parcel records. Download free sample data here.

Jefferson County Population

Jefferson County had 12,085 residents in 2020. That was 6% higher than in 2010. Jefferson County added 2,036 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 7 people per square mile. Some of the county's most populated postal areas include Clancy, Whitehall and Boulder.

Population Trend in Jefferson County MT

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

Jefferson County Zip Codes

Jefferson County has 6 zip codes. Some of the county's most populated zip codes include Clancy (59634), Whitehall (59759) and Boulder (59632). Clancy is the largest zip by population, with about 5,393 residents or 45% of the county total. Together, the three largest zips account for about 90% of all county residents based on 2020 population estimates.

Most Populated Zip Codes in Jefferson County MT

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

Jefferson County Demographics

Jefferson County has a median age of 47.3, which makes the county a little older than Montana overall. About 20.2% of residents are under 18, while 22.8% 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 27.4% of the population, which points to a solid working-age base. About 32.7% 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 Jefferson County MT

Jefferson County School Districts

Jefferson County is served by a network of public school districts across the map area. Several larger districts account for a substantial share of students across the county map area. A few larger districts account for much of the county-serving student population. Enrollment trends are not available yet for the districts shown on the county map.

Jefferson County Housing & Real Estate

Jefferson County has a median home value of $408,000 and a median gross rent of $886. About 83% 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 below the state average. In March 2026, the median listing price was $651,000 and homes spent about 133 days on the market.

Businesses in Jefferson County, MT

Jefferson County has 496 business listings across 222 categories. The largest categories in Jefferson County business listings are Structure And Geography (20, 4.0%), Churches & Religious Organizations (13, 2.6%), and Auto Repair (10, 2.0%). The full Jefferson County business listings dataset includes names, categories, addresses and contact details where available. Jefferson County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.

Top Business Categories in Jefferson County, MT

Jefferson County Business Listings

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

Jefferson County Basemaps

Jefferson 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.