Question: The Adams and Sickles Building is located in the county seat of what county?

Context paragraphs:
Former Audubon County Courthouse: The Former Audubon County Courthouse, also known as the Audubon County Historical Society Museum, is a historic building located in Exira, Iowa, United States.  Court proceedings were first held in a schoolhouse in Hamlin’s Grove after Audubon County was established in 1851.  The county seat was relocated to Exira ten years later, and a disagreement erupted over where the county seat should be located.  The county board of supervisors made an appropriation for a new courthouse in 1871, but its construction was delayed due to the disagreement.  Exira eventually won and officials constructed the courthouse for about $2,200.  The Exira Hall Company was established to build the two-story, frame structure.  County offices were located on the first floor and the courtroom was located on the second floor.  The county seat was moved to Audubon in 1879.

Lancaster School (Sigourney, Iowa): Lancaster School is located in rural Keokuk County, Iowa, United States southeast of the county seat of Sigourney.  It is the last public building in what was the former county seat of Lancaster.  It occupies the ground that was the courthouse square.  The school was one of six two-story buildings built by the county for educational purposes in the 1870s and early 1880s.  They required two teachers, and were therefore more expensive to operate.  This building was constructed in 1881 by Reynolds Bros.  It replaced a school building that had been built further east in 1874.  It is a two-story frame structure that measures 33 by .  The pedimented entry faces the south, and there is a belfry above the gable.  A single classroom is located on the northern two-thirds of both floors.  The town of Lancaster at one time had 32 buildings, but it started to decline in the 20th century.  Enrollment in the school was 119 in 1898, but fell to about thirty early in the 20th century.  When it closed in 1964 there were 13 students enrolled, and by that time they only utilized the first floor.  The former school building, one of the churches and a few houses are all that remain of Lancaster.  The building has been used in subsequent years as a voting facility.  It was listed on the National Register of Historic Places in 1984.

Adams County Courthouse (Illinois): The Adams County Courthouse is a government building in central Quincy, the county seat of Adams County, Illinois, United States.  Built in 1950 after a tornado destroyed its predecessor, it is the fourth building to serve as a courthouse for Adams County.

Johnston Library: The Johnston Library is a historic library located at 210 W. 10th St. in Baxter Springs, Kansas.  The building was constructed in 1872 to serve as a courthouse during Baxter Springs' unsuccessful attempt to become the Cherokee County seat.  Though Baxter Springs had lost an election to choose the county seat in 1869 to Columbus, supporters of both cities had attempted to fraudulently swing the election in their favor, and Baxter Springs hoped it could still become county seat in the future.  The building initially served as the county jail and sheriff's office until Columbus completed its jail in 1880.  After this, Baxter Springs ultimately gave up its attempts to become the county seat, and the building became its city hall.  In 1905, resident Niles P. Johnston bequeathed $5,000 to the city to start a library, and the city hall building was chosen to house it.

Gardnerville Branch Jail: The Gardnerville Branch Jail is a historic jail located at 1440 Courthouse St. in Gardnerville, Nevada.  The jail was built in 1910 and served as Douglas County's only jail from 1910 to 1915.  Prior to 1910, the only county jail was in Genoa, the county seat; however, since Gardnerville was several miles from Genoa, it resorted to housing prisoners in the local judge's granary.  As the granary was considered unfit for holding prisoners, the community petitioned the county to construct a new jail.  However, local leaders in Minden, who wanted to move the county seat to their town, protested the move, as they suspected that Gardnerville was attempting to claim the county seat itself.  Nonetheless, the county approved the construction of the new jail.  The jail housed its first prisoners before construction even finished, as the Genoa jail burned down; one prisoner was briefly chained to a post until the new jail could accommodate him.  Once completed, the jail served the county until 1915, when Minden became the county seat and opened its own county jail.

Trenton, New Jersey: Trenton is the capital city of the U.S. state of New Jersey and the county seat of Mercer County.  It was briefly the capital of the United States.  The city's metropolitan area is grouped with the New York metropolitan area by the United States Census Bureau, but directly borders the Philadelphia metropolitan area and is part of the Federal Communications Commission's Philadelphia Designated Market Area.  As of the 2010 United States Census, Trenton had a population of 84,913, making it the state's 10th-largest municipality.  The Census Bureau estimated that the city's population was 84,034 in 2014.

Adams and Sickles Building: Adams and Sickles Building is located in Trenton, Mercer County, New Jersey, United States.  The building was constructed in 1900 and added to the National Register of Historic Places on January 31, 1980.  It was the focal point for the West End neighborhood, remembered for its soda fountain and corner druggist.

Jasper County Community Unit School District 1: Jasper County Community Unit School District 1 is a unified school district based in Jasper County's county seat of Newton, Illinois; it is the only school district in the county and is, consequently, the main educational body in all of Jasper County, although it serves portions of Effingham County and Cumberland County as well.  This school district is composed of six schools in total; four elementary schools, one junior high school, and one high school.  There is also a prekindergarten program run at the high school of the district should parents wish to enroll their children early.  Willow Hill Elementary School, which is located in the village of its namesake, serves only kindergarteners; its proximity to the county seat and central position in the county allows its students to dawn from all parts of the county and still have easy access to the elementary school they will attend.  The principal of Willow Hill is Dave Parker.  Grove Elementary School is located in Island Grove, Illinois, the highest point of elevation in the county.  Grove Elementary School educates students from kindergarten to grade six, and it runs a prekindergarten program as well.  Craig Carr is the principal of this school.  Ste. Marie Elementary School is located in the southern Jasper County village of Ste. Marie, and serves students in grades one through six.  The principal of Ste. Marie is David Parker, the principal of Willow Hill Elementary School.  Newton Elementary School is located in the county seat of Newton, and serves most of west Jasper County's first through sixth graders under principal Travis Wyatt.  The latter three elementary schools feed into Jasper County Junior High School and are taught in the facility during seventh and eighth grade while being supervised by Newton Elementary School principal Travis Wyatt before graduating into Newton Community High School.  Students in grades nine through twelve spend their last leg of precollegiate education at this school; their principal is Ruth Kerner.  The district superintendent is Ron Alburtus, and the district's mascot is the eagle.

Adams County Courthouse (Iowa): The Adams County Courthouse is located in Corning, Iowa, United States.  Quincy was Adams County's first county seat, and a frame building was built for a courthouse in the 1850s.  Corning became the county seat in 1872, and a frame building was built there for the courthouse.  It was replaced by a brick Romanesque Revival structure in 1890.  It was similar to the Adair County Courthouse and the Monona County Courthouse.  The present Modernist courthouse was completed in 1955 for $218,635.

Cerro Gordo County Courthouse (Iowa): The Cerro Gordo County Courthouse is located in Mason City, Iowa, United States.  When Cerro Gordo County was created in 1855 and Mason City was selected to be the county seat.  Dissatisfaction in the western part of the county led the Iowa legislature to appoint three new commissioners who would move the county seat to Livonia.  A courthouse was built there.  A petition signed by over half of the citizens of the county requested that the county seat be moved back to Mason City.  Mason City also won the election in 1858 to decide the matter 155-48.  Two courthouses have stood in Mason City prior to the present Modernist structure that was occupied by the county in 1960.  It had been built as the Standard Oil Building, and was acquired by the county in 1959 for $159,400 and then remodeled for their use.

Supporting paragraphs: Adams and Sickles Building Trenton, New Jersey
Answer: Mercer County