Presences by Nations
| Editions | Nation | Swimmer |
| 56 |  Italy
| 124 (24 women) |
| 53 |  Argentina
| 73 (15 women) |
| 42 |  Egypt
| 51 (12 women) |
| 36 |  USA
| 37 (15 women) |
| 35 |  Syria
| 22 (1 woman) |
| 31 |  Netherlands
| 18 (6 women) |
| 31 |  Spain |
27 (4 women) |
| 29 | .svg){kind=small} Yugoslavia
| 15 (3 women) |
| 27 |  France
| 21 (5 women) |
| 26 |  Hungary |
15 (6 women) |
| 25 |  England
| 13 (7 women) |
| 21 |  Germany
| 17 (6 women) |
| 21 |  Brazil
| 23 (8 women) |
| 19 |  Canada |
17 (11 women) |
| 17 |  Macedonia |
6 (1 woman) |
| 16 |  India
| 12 (2 women) |
| 15 |  Lebanon
| 11 |
| 14 | .svg){kind=small} Mexico
| 16 (4 women) |
| 13 |  Australia
| 14 (8 women) |
| 13 |  Turkey
| 6 |
| 12 |  Bulgaria
| 6 (3 women) |
| 11 |  Sweden
| 8 (2 women) |
| 10 |  Iraq
| 14 |
| 10 |  Russia
| 7 (5 women) |
| 9 |  Czech Rep.
| 7 (2 women) |
| 9 |  Saudi Arabia
| 7 |
| 8 |  Sudan
| 8 (2 women) |
| 8 | Czechoslovakia
| 8 (4 women) |
| 8 |  Croatia
| 5 (4 women) |
| 8 |  Greece
| 5 |
| 8 | .svg){kind=small} Belgium
| 5 (2 woman) |
| 7 |  Japan
| 2 (2 women) |
| 7 |  Kuwait
| 10 |
| 6 |  Poland
| 8 (1 woman) |
| 5 |  New Zeland |
7 (3 women) |
| 4 |  Denmark
| 4 (2 women) |
| 4 |  Switzerland
| 2 (1 woman) |
| 4 |  Malta
| 1 |
| 3 |  Belarus
| 2 |
| 3 |  Slovenia
| 3 |
| 3 |  South Africa
| 4 (1 woman) |
| 3 |  Pakistan
| 2 |
| 2 | .svg){kind=small} Antille Olandesi |
3 |
| 2 |  Norway
| 1 |
| 2 |  Venezuela
| 1 (1 woman) |
| 1 |  URSS
| 2 |
| 1 |  Austria
| 1 |
| 1 |  UAE
| 2 |
| 1 |  Jordan
| 1 |
| 1 |  Israel
| 1 |
| 1 |  Libya
| 2 |
| 1 |  Oman
| 4 |
| 1 |  Kazakistan
| 1 |
| 1 |  Portugal
| 1 |
| 1 |  Aruba
| 1 |
| 1 |  Palestine
| 1 |
| 1 |  Ireland
| 1 |