| Name | Count | Years active |
|---|---|---|
| Mills & Boon | 8771 | 1880, 1957, 1960, 1963-2004 |
| Mills and Boon | 1847 | 1959, 1962-1964, 1967-1996, 1998 |
| Mills & B. | 713 | 1970-1994, 1996 |
| Mills &Boon | 116 | 1969-1970, 1974, 1976, 1984, 1986-1987, 1989-1997 |
| Mills& Boon | 105 | 1969-1970, 1977, 1983-1985, 1989-1997 |
| Harlequin | 73 | 1983-1985 |
| Mills & Boon Ltd | 65 | 1970-1971, 1980, 1987 |
| Millsand Boon | 43 | 1971-1976, 1978-1980 |
| Mills and Boon Ltd | 34 | 1968, 1971 |
| Mills & B | 28 | 1966-1969, 1971, 1977, 1984, 1987 |