Metropolitan area
The Tulsa Metropolitan Area, or the region immediately surrounding Tulsa with strong social and economic ties to the city, occupies a large portion of the state's northeastern quadrant. It is informally known as "Green Country," a name derrived from the state's official tourism designation for all of northeastern Oklahoma, though its usage in relation to the Tulsa Metropolitan Area can be traced to the early part of the 20th century.
The United States Census Bureau defines the sphere of the city's influence as the Tulsa Metropolitan Statistical Area (MSA), spanning seven counties: Tulsa, Rogers, Osage, Wagoner, Okmulgee, Pawnee, and Creek. The 2006 US Census Estimate shows the Tulsa MSA to have 897,752 residents, with a population expected to reach one million in three to five years. The Tulsa-Bartlesville Combined Statistical Area (CSA) is created by adding the nearby Bartlesville, Oklahoma micropolitan area, consisting of Washington County in Northeastern Oklahoma. In 2006, US Census Estimates show the Tulsa-Bartlesville CMSA to have 946,993 residents.
(Source: Wikipedia.org)
