Source: U.S. Bureau of Economic Analysis
GDP by county is a measure of the market value of final goods and services produced within a county area in a particular period. While other measures of county economies rely mainly on labor market data, these statistics incorporate multiple data sources that capture trends in labor, revenue, and value of production. As a result, the capital-intensive industries are captured more fully than when measured solely by labor data.
U.S. Bureau of Economic Analysis, Gross Domestic Product: All Industries in Petroleum County, MT [GDPALL30069], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/GDPALL30069, December 3, 2021.