Humboldt is a city in Gibson and Madison counties, Tennessee.
 The population was 8,452 at the 2010 census, a decline of 1,015 from 2000.
 It is the principal city of and is included in the Humboldt, Tennessee Micropolitan Statistical Area, which is included in the Jackson, Tennessee-Humboldt, Tennessee Combined Statistical Area.
 It is Gibson County's largest city and Madison County's second largest city after Jackson.
Princeton is a city in Patoka Township, Gibson County, Indiana, United States.
 The population was 8,644 at the 2010 census, and it is part of the greater Evansville, Indiana, Metropolitan Area.
 The city is the county seat of and the largest city in Gibson County.
Milan ( ) is the second largest city after Humboldt in Gibson County, Tennessee, and the largest entirely within the county.
 It is home to the Milan Army Ammunition Plant, the West Tennessee Agricultural Museum and several historical sites listed on the National Register of Historic Places (NRHP).
 The city was the first in Tennessee to begin no-till farming and to flouridate its drinking water.
 The Milan Endowment for Growth in Academics (MEGA) was the first private community financial endowment for public schools in Tennessee.
The South Gibson School Corporation is the largest of the three public school governing institutions in both enrollment and territory covered in Gibson County, Indiana as well as one of the ten largest in enrollment in Southwestern Indiana.
 The SGSC is responsible for a district including four townships of southern and southwestern Gibson County; Johnson, Montgomery, Union, Wabash, and parts of Barton, Center and Patoka Townships within Gibson County as well as drawing in students from Northern Vanderburgh and Posey Counties.
 It consists of a superintendent, a five-member school board, eight principals and vice principals and employs around 190 teachers and specialists.
 As of the 2007-08 school year, the overall enrollment stands at around 2000-2500 students in K-12.
 The population of the areas inside South Gibson area are starting to become among the fastest growing areas in Southwestern Indiana with all three main towns of Southern Gibson County, Fort Branch Haubstadt and Owensville posting 5-10% population gains every year as well as a number of subdivisions building up outside and around the three towns and at least three of the seven smaller hamlets.
 The SGSC's renovation of the 35-year-old Gibson Southern High School was complete as of 2010-11 School Year.
The North Gibson School Corporation is the second largest of the three public school governing institutions in Gibson County, Indiana, United States as well as one of the twenty largest in enrollment in Southwestern Indiana.
 The NGSC is responsible for a district including three townships of northern and northeastern Gibson County; Patoka, Washington, and White River.
 However, the Gibson-Pike-Warrick Special Education Cooperative sends the majority of the special needs students from Pike and Gibson Counties to Princeton Community High School, the high school of the district.
South Gibson County High School is a school in Medina, Tennessee, serving students around Medina and Gibson, Tennessee.
 It opened in 2009 to accommodate a growing population of students who lived in southern Gibson County, but were zoned to attend Gibson County High School.
Milan Army Ammunition Plant (MLAAP) is an ammunition plant of the United States Army near Milan, Tennessee and about 23 miles (37 km) north of Jackson, Tennessee.
The East Gibson School Corporation is the smallest of the three public school governing institutions in Gibson County in both land area and student body with just over 1,000 students.
 The EGSC is responsible for a district including three townships of easternmost Gibson County; Barton, Center, and Columbia.
 Waldo J. Wood Memorial Jr/Sr High School, Barton Township School, Francisco Elementary School, and Oakland City Elementary School make up the facilities of the district.
 Buckskin, Francisco, Mackey, Oakland City, and Somerville are the towns served by the East Gibson School Corporation.
 Waldo J. Wood Memorial Jr/Sr High School is the smallest of Gibson County's three high schools at 382 students.
Trenton is a city in Gibson County, Tennessee.
 The population was 4,264 at the 2010 census, down from 4,683 at the 2000 census.
 It is the county seat of Gibson County, and its third largest city.
The Gibson Generating Station is a coal-burning power plant located at the northernmost end of Montgomery Township, Gibson County, Indiana, United States.
 It is close to the Wabash River, 1.5 miles southeast of Mount Carmel, Illinois, 2 miles south of the mouth of the Patoka River, and 4 miles south of the mouth of the White River.
 The closest Indiana communities are Owensville 7.5 miles to the southeast of the plant, and Princeton, 10.5 miles to the east.
 With a 2013 aggregate output capacity among its five units of 3,345 megawatts, it is the largest power plant run by Duke Energy, the third-largest coal power plant in the world, and the tenth-largest electrical plant in the United States, With the reduction of Nanticoke Generating Station, it became the largest coal power plant in North America by generated power late in 2012.
 Also on the grounds of the facility is a 3000 acre large man-made lake called Gibson Lake which is used as a cooling pond for the plant.
 Neighboring the plant is a Duke-owned, publicly accessible access point to the Wabash River near a small island that acts as a wildlife preserve.
 This is the nearest boat-ramp to Mount Carmel on the Indiana side of the river.
 Located immediately south of Gibson Lake, the plant's cooling pond, is the Cane Ridge National Wildlife Refuge, the newest unit of the Patoka River National Wildlife Refuge and Management Area.
 Opened in August 2006, this 26 acre area serves as a nesting ground for the least tern, a rare bird.
 Cane Ridge NWR is reportedly the easternmost nesting ground for the bird in the U.S.
 The Gibson Generating Station is connected to the power grid via five 345 kV and one 138 kV transmission lines to 79 Indiana counties including the Indianapolis area and a sixth 345 kV line running from GGS to Evansville and Henderson, owned by Vectren and Kenergy.

Question: How many miles is the city that is the largest in the Gibson County from Jackson, Tennessee?
Answer: 23 miles