| Source | Number of Documents in MPRESS |
| Topology Atlas | 3352 |
| Algebraic Number Theory Server | 379 |
| K-Theory Preprint Server | 501 |
| Austria / JABaPub | 1817 |
| Australia | 43 |
| Brazil (IMPA) | 30 |
| Canada | 68 |
| ch | 1 |
| com | 2 |
| Germany / D-MathNet.preprints | 20451 |
| Denmark | 663 |
| USA | 2290 |
| es | 1 |
| Italy / SINM-MRPESS | 25 |
| nz | 142 |
| org | 43645 |
| pl | 88 |
| Russia / St. Petersburg Mathematical Society | 377 |
| Schweden / Stockholm | 158 |
| Turkey | 1 |