Jacksonville, Florida
Jacksonville is the largest city in the U.S. state
U.S. state
A U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...

 of Florida
Florida is a state in the southeastern United States, located on the nation's Atlantic and Gulf coasts. It is bordered to the west by the Gulf of Mexico, to the north by Alabama and Georgia and to the east by the Atlantic Ocean. With a population of 18,801,310 as measured by the 2010 census, it...

 in terms of both population and land area, and the largest city by area in the contiguous United States
Contiguous United States
The contiguous United States are the 48 U.S. states on the continent of North America that are south of Canada and north of Mexico, plus the District of Columbia....

. It is the county seat
County seat
A county seat is an administrative center, or seat of government, for a county or civil parish. The term is primarily used in the United States....

 of Duval County
Duval County, Florida
Duval County is a county located in the U.S. state of Florida. As of 2010, the population was 864,263. Its county seat is Jacksonville, with which the Duval County government has been consolidated since 1968...

, with which the city government consolidated
Jacksonville Consolidation
The Jacksonville Consolidation was the city-county consolidation of the governments of the City of Jacksonville and Duval County, Florida. It was effected on October 1, 1968.-Background:...

 in 1968. The consolidation gave Jacksonville its great size and placed most of its metropolitan population
Metropolitan area
The term metropolitan area refers to a region consisting of a densely populated urban core and its less-populated surrounding territories, sharing industry, infrastructure, and housing. A metropolitan area usually encompasses multiple jurisdictions and municipalities: neighborhoods, townships,...

 within the city limits; with a population of 821,784, it is the most populous city proper
City proper
City proper is defined as a "locality with legally fixed boundaries and an administratively recognized urban status that is usually characterized by some form of local government", or the area within the corporate limits. This definition has been consistently used since the United Nations...

 in Florida and the eleventh most populous in the United States.