Question: In 2010, the population of Garfield County in Montana was 1,206 and the county seat, Jordan, Montana, had a population of 343. What is the name of the survey that determines these populations?

Context articles: Jordan, Montana
Garfield County, Oklahoma
Cohagen, Montana
Brusett, Montana
Burwell, Nebraska
Enid, Oklahoma
Garfield County, Montana
Mosby, Montana
Pomeroy, Washington
Sand Springs, Montana

Jordan is a town in and the county seat of Garfield County, Montana, United States.
 The population was 343 at the 2010 census.
Garfield County is a county located in the U.S. state of Oklahoma.
 As of the 2010 census, the population was 60,580.
 Enid is the county seat and largest city within Garfield County.
 The county is named after President James A. Garfield.
Cohagen is an unincorporated community in southeastern Garfield County, Montana, United States.
 It lies along Highway 59 southeast of the town of Jordan, the county seat of Garfield County.
 Its elevation is 2,720 feet (829 m).
 Although Cohagen is unincorporated, it has a post office, with the ZIP code of 59322, which opened on 1905-08-18.
Brusett is an unincorporated community in northwestern Garfield County, Montana, United States.
 It lies along local roads west of the town of Jordan, the county seat of Garfield County.
 Its elevation is 2,904 feet (885 m).
 Although Brusett is unincorporated, it has a post office, with the ZIP code of 59318.
Burwell is a city in Garfield County, Nebraska, United States.
 The population was 1,210 at the 2010 census.
 It is the county seat of Garfield County.
Enid (ē'nĭd) is a city in Garfield County, Oklahoma, United States.
 As of the 2010 census, the population was 49,379, making it the ninth-largest city in Oklahoma.
 It is the county seat of Garfield County.
 Enid was founded during the opening of the Cherokee Outlet in the Land Run of 1893, and is named after Enid, a character in Alfred, Lord Tennyson's "Idylls of the King".
 In 1991, the Oklahoma state legislature designated Enid the "purple martin capital of Oklahoma."
 Enid holds the nickname of "Queen Wheat City" and "Wheat Capital" of Oklahoma and the United States for its immense grain storage capacity, and has the third-largest grain storage capacity in the world.
Garfield County is a county located in the U.S. state of Montana.
 As of the 2010 census, the population was 1,206.
 Its county seat is Jordan.
Mosby (also Half-Breed Crossing) is an unincorporated community in southwestern Garfield County, Montana, United States.
 It lies along Highway 200 southwest of the town of Jordan, the county seat of Garfield County.
 Its elevation is 2513 ft above sea level.
 Mosby had a post office that opened on 1904-06-29 was moved on 1983-02-18, and closed on 2015-07-30 but the community still has a separate ZIP code of 59058.
 As of 2015, there is an RV park where the gas station was.
 There was a gas station and repair shop open from 1950 to 1983.
Pomeroy is a city in Garfield County, Washington, United States.
 The population was 1,425 at the 2010 census.
 It is the county seat of and only city in Garfield County.
Sand Springs is an unincorporated community in southwestern Garfield County, Montana, United States.
 It lies along Highway 200 southwest of the town of Jordan, the county seat of Garfield County.
 Its elevation is 3,192 feet (973 m).
 Although Sand Springs is unincorporated, it has a post office with the ZIP code of 59077, which opened on 1911-03-01.
 Sand Springs is over 100 years old, founded at the turn of the 20th century by sheep, cattle, and horse ranchers.
 It has a population of about 90 people.
 It gets its name from the wide expanse of sandy soil and life-giving springs in the area.
 Most people currently make a living as ranchers and farmers.
 The farmable acres in this area are some of the richest, most productive soils in the county; however much of the land is suitable only for grazing due to the terrain.
 There is a family-owned reservoir that is open to the public for fishing.
 The economy is supported by recreation -there is excellent hunting, fishing, and camping opportunities available all year round.
 Just check in at the Fish, Wildlife, and Parks station located in the center of town.
 There is a General Store attached to the Post Office.
 It has lunch available that you can eat at a picnic table.
 People are allowed to camp behind it.
 There is a church that has a service every other Sunday.
 It is the location of the annual Christmas program put on by the school.
 Sand Springs School is a one-room schoolhouse that serves kindergarten through eighth grade.