One third of Eastleigh Borough Council is elected each year, followed by one year without election.
| Election | Overall control | Lib Dem | Conservative | Labour | Ind. | |
|---|---|---|---|---|---|---|
| 1973 | 5 | 13 | 20 | 4 | ||
| 1976 | 1 | 36 | 6 | 1 | ||
| 1978 | 1 | 37 | 4 | 1 | ||
| 1979 | 2 | 34 | 7 | 1 | ||
| 1980 | 4 | 31 | 9 | - | ||
| 1982 | 8 | 25 | 11 | - | ||
| 1983 | 11 | 22 | 11 | - | ||
| 1984 | 14 | 20 | 10 | - | ||
| 1986 | 19 | 16 | 9 | - | ||
| 1987 | 21 | 15 | 8 | - | ||
| 1988 | 23 | 15 | 6 | - | ||
| 1990 | 22 | 16 | 6 | - | ||
| 1991 | 20 | 17 | 7 | - | ||
| 1992 | 19 | 19 | 6 | - | ||
| 1994 | 22 | 18 | 4 | - | ||
| 1995 | 27 | 13 | 4 | - | ||
| 1996 | 31 | 7 | 6 | - | ||
| 29 | 7 | 8 | - | |||
| 29 | 7 | 8 | - | |||
| 28 | 9 | 7 | - | |||
| 31 | 9 | 4 | - | |||
| 30 | 10 | 4 | - | |||
| 32 | 9 | 3 | - | |||
| 34 | 7 | 3 | - | |||
| 37 | 5 | 2 | - | |||
| 38 | 4 | 2 | - | |||
| 39 | 4 | 1 | - | |||
| 38 | 4 | 0 | 2 | |||
| 40 | 4 | 0 | 0 | |||
| 40 | 4 | 0 | 0 | |||
| 38 | 6 | 0 | 0 | |||
| 38 | 6 | 0 | 0 | |||
| 32 | 4 | 0 | 3 | |||
| 34 | 2 | 0 | 3 | |||
| 32 | 2 | 0 | 5 | |||
| 33 | 1 | 0 | 5 | |||
| 2023 | 35 | 1 | 0 | 3 | ||
| 2024 | 35 | 1 | 0 | 3 | ||