The crowning of the new Rose of Tralee Maria Walsh drew a peak-minute audience of 760,300 viewers on RTÉ One on Tuesday night and an average of 694,000 viewers.
Tuesday night's show had a reach (net number or percentage of people who have seen a particular piece of broadcast output) of nearly 1.7m viewers and a share of 50% of those watching television at the time.
The Rose of Tralee Festival was also streamed live and is available on demand on www.rte.ie/player.
Over 62,200 streams have been recorded to date, with 28,049 of this being from the live online simulcasts on both nights.
RTÉ Player's backstage show, Live from the Red Room, presented by Aidan Power, drew audiences of over 10,000 for its live streaming.
Rose of Tralee host Dáithí Ó Sé said: "This is my fifth year presenting the Rose of Tralee and I felt the atmosphere around Tralee town leading up to the show was electric.
"I'm delighted for this year's Rose Maria. Her wonderful and unique personality really shone through during the week and also on stage. She will be a great ambassador for the Rose of Tralee."
RTÉ's executive producer for the show, Michael Kealy, said: "The viewership figures for this year's show are fantastic. A share of 50% for the second night means one in two people in Ireland watching television at that time tuned in to The Rose of Tralee.
"Ever the professional, Dáithí Ó Sé's energetic personality made the live event much more fun for the Roses! I wish the newly-crowned Rose of Tralee Maria Walsh all the best in future."
Source: TAM Ireland Ltd/ Nielsen TAM, Live plus VOSDAL (Viewing On Same Day As Live) data, National Individuals.
Streaming figures from comScore Digital Analytix.