Below are the top 25 programs on cable on Sunday, 2/21/21. Items of note include the series premiere of Allen v. Farrow on HBO, Stanley Tucci: Searching for Italy on CNN, and the premiere of When Calls the Heart on Hallmark.
(Note: Click any show with its name in orange to be taken to its page in the TV Ratings Guide Cable Ratings Database.)
| Show | Network | 18-49 Viewers | Viewers (mil.) | 
| 90 Day Fiancé | TLC | 0.72 | 2.44 | 
| Real Housewives of Atlanta | Bravo | 0.51 | 1.43 | 
| NBA: Nets v. Clippers | ESPN | 0.5 | 1.51 | 
| Sister Wives | TLC | 0.32 | 1.48 | 
| NHL: Flyers v. Bruins | NBCSN | 0.31 | 1.02 | 
| NBA Courtside | ESPN | 0.31 | 0.87 | 
| Home Town | HGTV | 0.3 | 2.16 | 
| Food That Built America | History | 0.29 | 1.25 | 
| Sportscenter | ESPN | 0.28 | 0.78 | 
| Home Town | HGTV | 0.25 | 1.62 | 
| Girl Meets Farm | Food | 0.23 | 1.00 | 
| Worst Cooks in America | Food | 0.22 | 0.83 | 
| Modern Marvels | History | 0.21 | 0.88 | 
| Watch What Happens Live | Bravo | 0.21 | 0.63 | 
| NHL Live | NBCSN | 0.2 | 0.64 | 
| Stanley Tucci: Searching for Italy | CNN | 0.2 | 1.64 | 
| When Calls the Heart | Hallmark | 0.19 | 2.14 | 
| Liga MX | TUDN | 0.19 | 0.42 | 
| Momma Named Me Sheriff | Adult Swim | 0.18 | 0.35 | 
| She Believes Cup | FS1 | 0.18 | 0.57 | 
| Sportscenter | ESPN | 0.18 | 0.47 | 
| Last Week Tonight with John Oliver | HBO | 0.18 | 0.75 | 
| Food That Built America | History | 0.17 | 0.86 | 
| NBA Pre-Game | ESPN | 0.17 | 0.48 | 
| PGA Tour: Genesis Invitational | Golf | 0.17 | 1.16 | 
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| Highlights Below the Chart: | 
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| Lincoln: Divided We Stand | CNN | 0.14 | 1.23 | 
| Allen v. Farrow | HBO | 0.06 | 0.39 | 
| American Gods | Starz | 0.05 | 0.20 | 
| The Circus | Showtime | 0.03 | 0.26 | 
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