This was a big rise from the previous Tuesday, following the Easter break, when Campbell Live was watched by 221,900 people aged 5 and older (5.3 per cent of the audience) and 63,700 in the 25-54 bracket (3.4 per cent).
MediaWorks spokeswoman Rachel Lorimer said the TV3 parent company would not comment on Campbell Live's ratings while the show was still under review.
But yesterday staff of the show, headed by veteran broadcaster John Campbell, took to Twitter to thank its viewers for support, writing: "Thanks for sticking with us New Zealand. See you tonight!"
Since it was announced that Campbell Live was under review, three separate petitions to save the show have gathered more than 95,000 signatures between them.
Former Labour leader David Cunliffe gave the nod to the broadcaster by changing his Twitter profile picture to a mugshot of Campbell.
Prime Minister John Key told NewstalkZB many Kiwis wanted to watch lighter, more entertaining shows in the 7pm timeslot, like TVNZ rival Seven Sharp.
Mr Key said commercial television's role was not to hold the Government to account.
"It is to entertain its viewers and follow news stories. A great many of those don't involve the Government, some do."
Mazda, which has sponsored Campbell Live for seven years, would not comment on the announcement that the show was being reviewed.
"[MediaWorks'] announcement is their business, it certainly has no involvement from Mazda," spokesman Glenn Harris said.
Meanwhile, Paul Henry's new show premiered on April 7 to an audience of 51,200 in the 5-plus demographic and 19,700 in the 25 to 54 demographic.
The numbers equate to approximately 1 per cent of both demographics, and the show's ratings have remained at that level throughout the week.
"We are very happy with the way Paul Henry has launched," Ms Lorimer said.
She said compared with previous weeks across the same three-hour time slot, TV3's ratings had jumped 82 per cent among 25 to 54-year-olds.
Between April 7 and 13, TV One's Breakfast was watched by an average of 2.8 per cent of Kiwis aged 5 and over, and 2.4 per cent aged between 25 and 54.