|Elevation||50–181 m (160–594 ft)|
|Land area1||10.06 km2 (3.88 sq mi)|
|- Density||900 /km2 (2,300 /sq mi)|
|INSEE/Postal code||77183/ 77260|
|1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km² (0.386 sq mi or 247 acres) and river estuaries.|
|2 Population without double counting: residents of multiple communes (e.g., students and military personnel) only counted once.|
In 1819, Edinburgh born naval officer Norwich Duff (1792–1862) recorded a note on La Ferté at a time when, it would appear, the Bourbon Restoration had led to a sudden halt in the Napoleonic road building boom. Then, as in too many subsequent years, memories of wartime destruction were fresh in this region:
...left Meaux a little before seven and after passing through a fine country for five leagues, arrived at La Ferté-sous-Jouarre, a neat little town on the banks of the [Rivers] Marne and Morin, where we breakfasted. This town supplies the greatest part of France with mile stones, which are considered the finest in Europe. The banks of the river and each side of the road were covered with them as we passed...The road from La Ferté to Chateau Thiéry (seven leagues) is very hilly but the scenery very fine. [We] passed three bridges over the Marne now rebuilt that were blown up on the advance of the Allies in 1813.
The artist Émile Bayard was born in this town (1837).
On 14 August 1921, the town of La Ferté-sous-Jouarre was awarded the War Cross with the following citation:
"Occupée dès le début de la guerre, La Ferté a vu sa population gravement molestée par les Allemands. La Ferté a été l'objet, en 1914 et en 1918, de violents bombardements qui ont détruit nombre de ses maisons. Malgré ses deuils, La Ferté a donné un bel exemple de sang-froid et d'endurance."
(English: "La Ferté was occupied from the very beginning of World War I and its population was severely manhandled by the Germans. La Ferté was submitted in 1914 and 1918 to violent shellings that destroyed several houses. In spite of its bereavements, La Ferté gave a good example of cold blood and endurance.") 
On the south-western edge of the town, on the south bank of the River Marne, is the La Ferté-sous-Jouarre memorial, commemorating over 3000 British soldiers with no known grave, who fell in fighting in the area.
Inhabitants of La Ferté-sous-Jouarre are called Fertois.
Notable residents 
- Antoine of Navarre (1518–1562), King of Navarre, Father Henri IV
- Charles, Cardinal de Bourbon (1523–1590), French Cardinal
- Madame de Pompadour (1721–1764), member of the French court
- Antoine Samuel Adam-Salomon (1818–1881), French sculptor & photography pioneer
- Henri Pouctal (1860–1922), early French silent film director
- Samuel Beckett (1906–1989), Irish avant-garde writer, dramatist, and poet
Twin towns 
See also 
|Wikimedia Commons has media related to: La Ferté-sous-Jouarre|
- 1999 Land Use, from IAURIF (Institute for Urban Planning and Development of the Paris-Île-de-France région) (English)
- French Ministry of Culture list for La Ferté-sous-Jouarre (French)
- Map of La Ferté-sous-Jouarre on Michelin (English)