Question: Which county shares a border with the county where the most populous city in the state that sentenced Demarcus Sears to death is located?

Knowledge 1: Capital punishment in the United States
As of November 2008, there is only one person on death row facing capital punishment who has not been convicted of murder. Demarcus Sears remains under a death sentence in Georgia for the crime of "kidnapping with bodily injury." Sears was convicted in 1986 for the kidnapping and bodily injury of victim Gloria Ann Wilbur. Wilbur was kidnapped and beaten in Georgia, raped in Tennessee, and murdered in Kentucky. Sears was never charged with the murder of Wilbur in Kentucky, but was sentenced to death by a jury in Georgia for "kidnapping with bodily injury." [SEP] Knowledge 2: List of municipalities in Georgia (U.S. state)
The largest municipality by population in Georgia is Atlanta with 420,003 residents, and the smallest municipality by population is Edge Hill with 24 residents. The largest municipality by land area is Augusta, a consolidated city - county, which spans 302.47 sq mi (783.4 km), while Edge Hill and Santa Claus are tied for the smallest at 0.18 sq mi (0.47 km) each. [SEP] Knowledge 3: Sno*Drift
Sno*Drift is a rally racing event held in Montmorency County, Michigan, annually, with headquarters in Atlanta, Michigan. The event is currently the first Rally America National Rally Championship event of the season. Currently the event is organized into three distinct rallies: the national championship event covering both days of rallying, and two regional rally events each covering one of the two days. Competitors may be entered in any or all of these events simultaneously. [SEP] Knowledge 4: Alpena Power Company
Alpena Power Company is a public utility company that provides electricity to most of Alpena County, Michigan, as well as southeastern Presque Isle County and the village of Hillman, in Montmorency County. The headquarters are located in Alpena, Michigan. The company was founded in 1881 by George N. Fletcher.
Knowledge 1: Capital punishment in the United States
As of November 2008, there is only one person on death row facing capital punishment who has not been convicted of murder. Demarcus Sears remains under a death sentence in Georgia for the crime of "kidnapping with bodily injury." Sears was convicted in 1986 for the kidnapping and bodily injury of victim Gloria Ann Wilbur. Wilbur was kidnapped and beaten in Georgia, raped in Tennessee, and murdered in Kentucky. Sears was never charged with the murder of Wilbur in Kentucky, but was sentenced to death by a jury in Georgia for "kidnapping with bodily injury." [SEP] Knowledge 2: List of municipalities in Georgia (U.S. state)
The largest municipality by population in Georgia is Atlanta with 420,003 residents, and the smallest municipality by population is Edge Hill with 24 residents. The largest municipality by land area is Augusta, a consolidated city - county, which spans 302.47 sq mi (783.4 km), while Edge Hill and Santa Claus are tied for the smallest at 0.18 sq mi (0.47 km) each. [SEP] Knowledge 3: Sno*Drift
Sno*Drift is a rally racing event held in Montmorency County, Michigan, annually, with headquarters in Atlanta, Michigan. The event is currently the first Rally America National Rally Championship event of the season. Currently the event is organized into three distinct rallies: the national championship event covering both days of rallying, and two regional rally events each covering one of the two days. Competitors may be entered in any or all of these events simultaneously. [SEP] Knowledge 4: Tennessee
Tennessee (i/tɛnᵻˈsiː/) (Cherokee: ᏔᎾᏏ, Tanasi) is a state located in the southeastern United States. Tennessee is the 36th largest and the 17th most populous of the 50 United States. Tennessee is bordered by Kentucky and Virginia to the north, North Carolina to the east, Georgia, Alabama, and Mississippi to the south, and Arkansas and Missouri to the west. The Appalachian Mountains dominate the eastern part of the state, and the Mississippi River forms the state's western border. Tennessee's capital and second largest city is Nashville, which has a population of 601,222. Memphis is the state's largest city, with a population of 653,450.
Knowledge 1: Capital punishment in the United States
As of November 2008, there is only one person on death row facing capital punishment who has not been convicted of murder. Demarcus Sears remains under a death sentence in Georgia for the crime of "kidnapping with bodily injury." Sears was convicted in 1986 for the kidnapping and bodily injury of victim Gloria Ann Wilbur. Wilbur was kidnapped and beaten in Georgia, raped in Tennessee, and murdered in Kentucky. Sears was never charged with the murder of Wilbur in Kentucky, but was sentenced to death by a jury in Georgia for "kidnapping with bodily injury." [SEP] Knowledge 2: List of municipalities in Georgia (U.S. state)
The largest municipality by population in Georgia is Atlanta with 420,003 residents, and the smallest municipality by population is Edge Hill with 24 residents. The largest municipality by land area is Augusta, a consolidated city - county, which spans 302.47 sq mi (783.4 km), while Edge Hill and Santa Claus are tied for the smallest at 0.18 sq mi (0.47 km) each. [SEP] Knowledge 3: Sno*Drift
Sno*Drift is a rally racing event held in Montmorency County, Michigan, annually, with headquarters in Atlanta, Michigan. The event is currently the first Rally America National Rally Championship event of the season. Currently the event is organized into three distinct rallies: the national championship event covering both days of rallying, and two regional rally events each covering one of the two days. Competitors may be entered in any or all of these events simultaneously. [SEP] Knowledge 4: Furman v. Georgia
In the following four years, 37 states enacted new death penalty laws aimed at overcoming the court's concerns about arbitrary imposition of the death penalty. Several statutes that mandated bifurcated trials, with separate guilt - innocence and sentencing phases, and imposing standards to guide the discretion of juries and judges in imposing capital sentences, were upheld in a series of Supreme Court decisions in 1976, led by Gregg v. Georgia. Other statutes enacted in response to Furman, such as Louisiana's which mandated imposition of the death penalty upon conviction of a certain crime, were struck down in cases of that same year.

Answer: Presque Isle County