Amazon's Kindle Fire took second place with 5.7 percent of online traffic last month, according to Chitika.
Apple's iPad continues to surpass the competition in Web traffic.
Among all tablets in the U.S. and Canada, the iPad scooped up an 84.3 percent chunk of online trafficduring June in the U.S. and Canada, Chitika reported on Tuesday. That percentage is based on the number of ad impressions seen by the advertising and Web analytics firm from June 15 to 21. That data is extrapolated to provide an estimate for the entire month.
The iPad's share represented a two percentage point gain from May and marked its highest number since the start of the year.
Most other tablets saw a decline in ad impressions from May, with the exception of Barnes & Noble's Nook, which saw its traffic grow by 37 percent. The bump in Web traffic was likely fueled by consumer demand for the Nook following B&N's extended Father's Day promotion.
Amazon's Kindle Fire took second place with a 5.9 percent share, followed by the Samsung Galaxy Tab with 4.2 percent, and the Nook with 1.2 percent.
Chitika's data incorporates around 300 million ad impressions in the U.S. and Canada and are measured by page views instead of unique visitors, according to the company. But the number of impressions can vary depending on the data being measured and the length of the study.