With the adoption of the North American Regional Broadcasting Agreement (NARBA), the station moved to its current 1310 AM frequency in 1941.

In 1978, after two failed attempts to sell the stations to Moffat Communications, the Canadian Radio-television and Telecommunications Commission (CRTC) approved their sale to Maclean-Hunter.

On October 12, 2010, the station announced it would be adopting an all-news format, to be branded 1310 News, taking effect the following Monday, October 18, at 6:00 a.m.[4] CIWW is the fourth Rogers station to adopt a 24-hour all-news format after CFTR Toronto, CKWX Vancouver, and CFFR Calgary.

The company also owns four other stations that combine the all-news format (during morning and afternoon drive) with talk programming.

Rogers announced on November 5, 2013 that CIWW would begin carrying Sportsnet Radio programing from Toronto sister station CJCL for the bulk of its schedule.

[5][6] On November 24, 2014, CIWW made a slight change to their schedule, which included morning news beginning a half-hour earlier at 5:00 am, Talk to the Hand was renamed to The Ed Hand Show and began airing for three hours, from 10 – 1 pm.

On March 18, 2016, the station named Mark Sutcliffe, a long-time Ottawa broadcaster and future mayor, as host of Ottawa Today, airing weekdays from 9 a.m. to 1 p.m, and repeated every weekend from 8 a.m. On May 10, 2016, it was announced that former CTV Ottawa news anchor Carol Anne Meehan would be hosting The Carol Anne Meehan Show, which aired from 1 to 3 p.m.

On September 16, 2016, afternoon newscasts started beginning at 3 p.m.On December 3, 2020, at 10:00 a.m., CIWW rebranded as CityNews, and began simulcasting on sister station CJET-FM (101.1) while continuing to broadcast on 1310.

(AM static)CJET-FM returned to its former country format on 101.1 FM when the callsign was changed to CKBY-FM, while 92.3 became CJET-FM which briefly simulcast CKBY-FM, stunting Christmas music on November 1, then back to its Jack FM format on December 27, 2023.

[13] As CityNews, local all-news blocks were heard from 5 to 6 AM weekday mornings, and also during All News Afternoons drive times.

On weekends, all-news blocks were heard in the mornings and overnights, with Best Of talk show segments airing in the afternoons and CBS Sports Radio in the evenings.

The station was also the Ottawa affiliate of the Toronto Blue Jays Radio Network.