However, the UK portion of these users totalled just under 5m, whereas 8.7m of the Guardian's 19.7m unique users were from the UK.
Guardian Unlimited, which includes and , saw its unique users climb from 16m in December, an increase of almost 24%. Its unique users figure is up by 25.5% from a year ago.
Times Online, which includes and , also held firm in third position with 15m unique users, a rise of 35% from the 11.2m users it recorded during December. The site's users are up by 38.5% from January 2007.
Almost 6m of the Times Online's unique users were from the UK in January.
also performed well last month, recording a 17% rise in unique users to 12.4m during January. This figure is up by 65% from a year ago. The website reached 5.3m UK users, which was up 80% from a year earlier.
The Sun Online network, covering , and , remains in fifth position despite a 27% rise in unique users from December to 13.3m in January. Its unique users are up by almost 40% on January 2007. Almost 5.5m of the site's unique users were from the UK.
The did not release its ABCe figure despite relaunching last month.