Every year Variety lists the top TV Networks in the US in prime time.  Very close between CBS, NBC and ABC with only ABC showing growth this past year.  Scroll way down to see the most popular networks for all viewers 7+ and then top 50 networks 18-49.  Also included archive years to compare last year to the numbers of previous seasons.
Top-Rated Channels of 2025: TV Network Ratings Winners & Losers