In the battle for dominance in the ever-evolving real estate information and online listings space, Zillow (Z) and Trulia (TRLA) have emerged as the big dogs on the block.

Together, Trulia and Zillow’s 84.6 million unique visitors in May 2014 account for twice the number of unique visitors as the next three real estate websites put together, according to the Beyond Syndication 2014 report from Clareity Consulting.

The next three services, which includes the once dominant’s Move (MOVE), altogether had 40.2 million unique visitors in May.

In May, Zillow had 53.8 million unique visitors to its website.

Click the chart to enlarge.

More recently, Trulia and Zillow both reported record-breaking traffic for June. Zillow has increased its traffic in each of the last five months, topping out at just shy of 83 million in June, which eclipsed May’s total by 1.5 million visitors.

Zillow is continuing to increase its own market share while its real estate search partner Yahoo maintains respectable traffic over 5%. Zillow also just added MSN to its “powered by” search partner list, and MSN has historically maintained around 2% of real estate traffic. Zillow’s network now includes AOL, HGTV’s Front Door, Yahoo and MSN.

Trulia is experiencing traffic growth of nearly 50% year over year and reported a record number of 51 million unique visitors in May. Mobile monthly unique visitors in the first quarter of 2014 increased by 68% the same period last year. remains steady, but pretty flat, even falling slightly when long-term partnerships with AOL and MSN were terminated.

NAR and Move last week launched PR and ad campaigns last week to showcase the “value of the local knowledge and accurate data” NAR members bring to the table.

According to Move, the site’s “Accuracy Matters” campaign aims to emphasize that “provides the most accurate, up-to-date and comprehensive real estate listings and content available online.”

“This effort is critically important for our industry as we unite under a common goals of providing the most accurate market data available online along with the deep local knowledge and Realtor expertise that buyers and sellers need,” NAR president Steve Brown said in the release.

Most recently, Move and Zillow have been involved in what looks to be a particularly nasty legal battle over the hiring of Errol Samuelson.

Samuelson is currently the chief industry development officer for Zillow. He was hired away from Move and in early March. Later in March, Move and NAR sued Zillow for breach of contract, alleging that Samuelson stole trade secrets and intellectual property from Move and brought it with him to Zillow.

In early July, Move and NAR won the opening battle in the suit, when Washington State Superior Court Judge Barbara Linde issued a preliminary injunction in the case, finding that Samuelson misappropriated trade secret information by acquiring it using improper means, and by copying it without authorization.