Casper's gross domestic product grew by 7.1 percent in 2013, according to a report released Tuesday by the U.S. Dept. of Commerce, making it the 11th-fastest-growing metropolitan area in the country.
The report credited oil and gas development for fueling the increase, with metropolitan areas throughout the Rocky Mountain region showing similar growth.
The GDP in Greeley, Colorado, grew by 10.1 percent, reaching $9.5 billion, the second-highest rate increase in the country.
Billings, Montana, grew 7.1 percent, to $9.3 billion, good for 12th in the nation. And Denver grew 4.3 percent to reach $179.8 billion, the 47th-greatest increase.
Casper's GDP increased from almost $6.9 billion in 2012 to $7.5 billion last year. That remained below its pre-recession level of $8.6 billion in 2008 but represented its highest point in the past five years.
Casper's GDP shrunk to a low of $5.9 billion in 2009.
Cheyenne also recorded a bump. The GDP of the Cowboy State's capital city increased 2.7 percent to $5.5 billion last year. That surpassed the $5.1 billion Cheyenne posted in 2008.
The capital city is home to increased oil production, though that has accelerated in 2014 after the figures were released.
GDP represents the value of all goods and services produced by an economy during a year.