Petroleum County GIS Maps

Petroleum 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.

Petroleum County Parcels

Petroleum County has 4,495 mapped parcels covering 1,060,061 acres. The median assessed value is $12,523. The median lot size is 160.05 acres. 3,925 parcels are 10 acres or larger. Vacant land accounts for 60.7% of parcels. Exempt property follows at 30.9% and improved property at 8.1%. The records carry 592 distinct owner names. About 11% of parcels list an owner mailing address outside Montana. Owner names, mailing addresses, assessed values and lot sizes are on nearly every parcel. Browse the interactive Petroleum County Parcel viewer here.

Petroleum County Parcel Data Coverage

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

Petroleum County Population

Petroleum County had 496 residents in 2020. That was 0.4% higher than in 2010. Petroleum County added 3 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 0 people per square mile. One of the county's most populated postal areas is Winnett.

Population Trend in Petroleum County MT

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

Petroleum County Zip Codes

Petroleum County has 1 zip codes. One of the county's most populated zip codes is Winnett (59087). Winnett is the largest zip by population, with about 396 residents or 80% of the county total. Together, the three largest zips account for about 80% of all county residents based on 2020 population estimates.

Most Populated Zip Codes in Petroleum County MT

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

Petroleum County Demographics

Petroleum County has a median age of 51.5, which makes the county a little older than Montana overall. About 13.2% of residents are under 18, while 27.9% are 65 or older. That gives the county a fairly even mix of younger families and older adults. The largest age group is 65 and over at about 27.9% of the population, which points to an older population profile. About 27.1% 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 Petroleum County MT

Petroleum County School Districts

Petroleum County is served by 1 public school district with 69 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 stayed fairly steady in recent years, but it is slightly lower than it was in 2017.

Largest School Districts by Enrollment in Petroleum County MT

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

Petroleum County Housing & Real Estate

Petroleum County has a median home value of $173,700 and a median gross rent of $769. About 77% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run below the Montana median, while rents come in below the state average. In March 2026, the median listing price was $352,000 and homes spent about 250 days on the market.

Businesses in Petroleum County, MT

Petroleum County has 35 business listings across 27 categories. The largest categories in Petroleum County business listings are Structure And Geography (4, 11.4%), River (2, 5.7%), and Public And Government Association (2, 5.7%). The full Petroleum County business listings dataset includes names, categories, addresses and contact details where available. Petroleum County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.

Top Business Categories in Petroleum County, MT

Petroleum County Business Listings

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

Petroleum County Basemaps

Petroleum 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.