Welcome to Fort Jefferson ...

Fort Jefferson is located in Monroe County<1>.

The location of Fort Jefferson has been provided by the Geographic Names Information System (ie- the GNIS).<2>

While we don't have a date for the founding of Fort Jefferson, you might consider that their post office opened in 1861.

A typical abbreviation for Fort Jefferson: Ft. Jefferson

Fort Jefferson is near sea level<3>.

Time Zone: Fort Jefferson lies in the Eastern Time Zone (EST/EDT) and observes daylight saving time

Area codes for Fort Jefferson: (305) & (786)<4>

Communities Also Named Fort Jefferson ...

Using our Gazetteer, we found that there are 2 communities that are also named Fort Jefferson - they are located in Kentucky and Ohio.

For more information, see our Tidbits & Trivia Page for Fort Jefferson.

Adding Fort Jefferson to Our Gazetteer ...

We originally found mention of Fort Jefferson in both the FIPS-55 and the GNIS. For more information, see the FIPS and GNIS Codes sections on our Miscellaneous Page.

From our notes, the earliest published mention we've found for Fort Jefferson was in the document titled List of Post Offices from Cameron Blevins and Richard Helbock.<5>

From that list, the Fort Jefferson post office opened in 1861.

For more details, see References and Mentions for Fort Jefferson.

Off-the-Road Links ...

Unfortunately, we don't know of a website for Fort Jefferson. If you can help, please contact us through our Feedback Page.

The official website for Monroe County: www.co.monroe.fl.us/

The official website for State of Florida: www.myflorida.com/

Footnotes ...

<1>	If you're interested in how the shape of Florida's counties, including Monroe, have changed over time, we recommend the Atlas of Historical County Boundaries.
<2>	The location has been supplied by the Geographic Names Information System - which is maintained by the U.S. Geological Survey (USGS). While these values should be definitive, we found that accuracy can vary and you should double-check the location if accuracy is required.
<3>	The elevation is an estimate for the area around Fort Jefferson - it will be higher in some places and lower in others.
<4>	Area code (786) is an overlay for area code (305).
<5>	A copy of their list with background information can be found at: https://cblevins.github.io/us-post-offices/data-biography/