These include Allendale County Courthouse, Antioch Christian Church, Erwin House, Gravel Hill Plantation, Red Bluff Flint Quarries, Roselawn, and Smyrna Baptist Church are listed on the National Register of Historic Places.

In his 2015 book entitled Deep South: Four Seasons on Back Roads, author Paul Theroux describes Allendale as a "ghost town", "poor, neglected, hopeless-looking, a vivid failure.

"[9] On April 5, 2022, an intense low-end EF3 tornado impacted the southern and southeast side of the city, causing major damage to several structures and injuring one person.

[11] According to the United States Census Bureau, the town has a total area of 3.3 square miles (8.5 km2), all land.

As of the 2020 United States census, there were 2,694 people, 1,244 households, and 667 families residing in the town.

[13] WEBA-TV/DT, a PBS station serving the South Carolina side of the Central Savannah River Area, is located here.