Hibernia is an unincorporated community in Clay County

Clay County, Florida

Clay County is a county located in the U.S. state of Florida. As of 2010, the population was 190,895. Its county seat is Green Cove Springs, Florida. Clay County is part of the Greater Jacksonville Metropolitan area.- History :...

, Florida

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...

, United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. It is located off US 17

U.S. Route 17 in Florida

U.S. Route 17 in Florida is a north–south United States Highway. It runs from the Punta Gorda, Florida Metropolitan Statistical Area northeast to the Greater Jacksonville Metropolitan Area....

, on the western bank of the St. Johns River

St. Johns River

The St. Johns River is the longest river in the U.S. state of Florida and its most significant for commercial and recreational use. At long, it winds through or borders twelve counties, three of which are the state's largest. The drop in elevation from the headwaters to the mouth is less than ;...

. It is the home of historic St. Margaret's Episcopal Church and Cemetery.

Post Office

A U.S. post office was established at Hibernia on June 19, 1849, but its name was changed on October 17, 1853 to Magnolia Mills, and on July 30, 1866, it was changed to Green Cove Springs

Green Cove Springs, Florida

Green Cove Springs is a city in Clay County, Florida, United States. The population was 5,378 at the 2000 census. As of 2010, the population recorded by the U.S. Census Bureau is 6,908. It is the county seat of Clay County....

. The Hibernia post office was reestablished on February 16, 1855, and remained open until May 15, 1931, when it was closed and the area assigned to Green Cove Springs.