| Year |
Event |
Status |
Participants |
NOCs |
| 1924 |
400 metres Freestyle, Women |
Olympic |
18 |
8 |
| 1928 |
400 metres Freestyle, Women |
Olympic |
20 |
10 |
| 1932 |
400 metres Freestyle, Women |
Olympic |
14 |
9 |
| 1936 |
400 metres Freestyle, Women |
Olympic |
20 |
10 |
| 1948 |
400 metres Freestyle, Women |
Olympic |
19 |
11 |
| 1952 |
400 metres Freestyle, Women |
Olympic |
33 |
17 |
| 1956 |
400 metres Freestyle, Women |
Olympic |
26 |
13 |
| 1960 |
400 metres Freestyle, Women |
Olympic |
22 |
13 |
| 1964 |
400 metres Freestyle, Women |
Olympic |
31 |
16 |
| 1968 |
400 metres Freestyle, Women |
Olympic |
30 |
17 |
| 1972 |
400 metres Freestyle, Women |
Olympic |
29 |
17 |
| 1976 |
400 metres Freestyle, Women |
Olympic |
34 |
22 |
| 1980 |
400 metres Freestyle, Women |
Olympic |
19 |
12 |
| 1984 |
400 metres Freestyle, Women |
Olympic |
25 |
17 |
| 1988 |
400 metres Freestyle, Women |
Olympic |
30 |
21 |
| 1992 |
400 metres Freestyle, Women |
Olympic |
33 |
24 |
| 1996 |
400 metres Freestyle, Women |
Olympic |
39 |
34 |
| 2000 |
400 metres Freestyle, Women |
Olympic |
39 |
31 |
| 2004 |
400 metres Freestyle, Women |
Olympic |
38 |
31 |
| 2008 |
400 metres Freestyle, Women |
Olympic |
41 |
34 |
| 2012 |
400 metres Freestyle, Women |
Olympic |
35 |
27 |
| 2016 |
400 metres Freestyle, Women |
Olympic |
32 |
25 |
| 2020 |
400 metres Freestyle, Women |
Olympic |
26 |
19 |