[3] A post office called Diamond was established in 1872, and remained in operation until 1909.

[5] The village was named for its location in the center of the "Black Diamond" coal district.

[6] On February 16, 1883, the Diamond Mine flooded, killing 72 miners.

[8] According to the 2021 census gazetteer files, Diamond has a total area of 1.90 square miles (4.92 km2), all land.

31.09% of all households were made up of individuals, and 17.99% had someone living alone who was 65 years of age or older.