The Khmer block spans U+1780–U+17FF, 128 codepoints in Plane 0 (Basic Multilingual Plane). 114 are assigned in Unicode 16.0; the other 14 are reserved for future characters.
All of its characters belong to the Khmer script.
By general category: 53 other letters (Lo), 22 non-spacing marks (Mn), 11 spacing marks (Mc), 10 decimal digits (Nd), 10 other numbers (No), plus smaller groups.
The first 103 arrived in Unicode 3.0 (1999); later additions came in 4.0 (11).