Joppa is a census-designated place (CDP) and unincorporated community in Cullman and Marshall counties, Alabama, United States. As of the 2020 census, its population was 556.

Joppa was named after the ancient city of Jaffa.

In the early 20th century, Joppa was an incorporated community within Cullman County and was listed on the U.S. Census from 1900 to 1920. It did not reappear on the census until 2010 when it was made a census-designated place (CDP).

On April 27, 2011, a tornado reportedly hit ground in the Joppa area as part of the 2011 Super Outbreak.

Joppa is located in northeastern Cullman County at 34°17′53″N 86°33′25″W / 34.298°N 86.557°W / 34.298; -86.557. A small portion of the CDP extends north into Marshall County. According to the U.S. Census Bureau, the Joppa CDP has a total area of 2.0 square miles (5.1 km), of which 1.9 square miles (5.0 km) are land and 0.039 square miles (0.1 km), or 1.38%, are water.

Joppa is located along Alabama State Route 69. The city of Arab is 3 miles (5 km) to the northeast, and the town of Baileyton is 4 miles (6 km) to the southwest.

Historical population

Census	Pop.	Note	%±
1900	130		—
1910	167		28.5%
1920	166		−0.6%
2010	501		—
2020	556		11.0%
U.S. Decennial Census

• Jack Lively, former Major League Baseball pitcher for the Detroit Tigers