The 1998-1999 television season is the 53rd network season in United States television history. It began on Monday, September 14, 1998 and ended on Sunday, May 30, 1999. The effective start date of the 1998-99 season for the purposes of audience measurement was Monday, September 14, 1998 through Saturday, September 18, 1999.
Universe estimates used to calculate a program or network's rating within that particular demographic for the 1998-99 TV season.
| Demographic | Population | Share |
|---|---|---|
| Households | 99,400,000 | |
| Persons 2+ | 263,410,000 | |
| Persons 2-11 | 39,430,000 | 15.0% |
| Persons 18-49 | 123,900,000 | 47.0% |
| Persons 25-54 | 116,820,000 | 44.4% |
| Females 18-49 | 62,660,000 | 23.8% |