The name Ivan was used for three tropical cyclones in the Atlantic Ocean, one in the Western Pacific Ocean, one in the South-West Indian Ocean, and one in the Australian region.
In the Atlantic:
The name Ivan was retired after the hurricane of 2004 and was replaced by Igor for the 2010 season.
In the Western Pacific:
In the South-West Indian:
In the Australian region:
The name Grace has been used for nineteen tropical cyclones worldwide: six in the Atlantic Ocean, ten in the Western Pacific Ocean, two in the Australian region of the South Pacific Ocean. and one in the South-West Indian Ocean.
The name Kate has been used for nineteen tropical cyclones worldwide, five in the Atlantic Ocean, one in the western Pacific Ocean, ten in the western Pacific Ocean, and three in the Southern Hemisphere.
The name Karen has been used for seventeen tropical cyclones worldwide: six in the Atlantic Ocean, nine in the Western Pacific Ocean, one in the South-West Indian Ocean, and one in the Australian region.
The name Gloria has been used for eighteen tropical cyclones worldwide: three in the Atlantic Ocean, two in the Australian region, one in the South-West Indian Ocean, and twelve in the Western Pacific Ocean. It has also been applied to one extratropical European windstorm.
The name Agnes has been used for a total of sixteen tropical cyclones worldwide: one in the Atlantic Ocean, thirteen in the Western North Pacific Ocean, one in the South-West Indian Ocean, and one in the South Pacific Ocean.
The name Fred has been used for a total of six tropical cyclones worldwide, three in the Atlantic Ocean, two in the Western Pacific Ocean, and one in the Australian region of the Indian Ocean.
The name Amy or Ami has been used for sixteen tropical cyclones worldwide: one in the Atlantic Ocean, two in the Australian region of the Indian Ocean, one in the South-West Indian Ocean, one in the South Pacific Ocean, and eleven in the Western Pacific Ocean.
During 2004, tropical cyclones formed within seven different tropical cyclone basins, located within various parts of the Atlantic, Pacific and Indian Oceans. During the year, a total of 132 systems formed with 82 of these developing further and were named by the responsible warning centre. The strongest tropical cyclone of the year was Cyclone Gafilo, which was estimated to have a minimum barometric pressure of 895 hPa (26.43 inHg). The most active basin in the year was the Western Pacific, which documented 29 named systems, while the North Atlantic, despite only amounting to 15 named systems, was the basin's most active season since 1996. Conversely, both the Eastern Pacific hurricane and North Indian Ocean cyclone seasons experienced the fewest cyclones reaching tropical storm intensity in recorded history, numbering 12 and 4, respectively. Activity across the southern hemisphere's three basins—South-West Indian, Australian, and South Pacific—was spread evenly, with each region recording seven named storms apiece. Throughout the year, 28 Category 3 tropical cyclones formed, including seven Category 5 tropical cyclones formed in the year.