Millennial Media published its latest S.M.A.R.T report for June this morning, showing that the US mobile Web has grown by 3% — from 75.3M to 77.4M active users.

Millennial’s US unique audience reach also increased 2% since May’s report, growing from 61.5M to 62.9M users month-over-month, showing an impressive 81% reach of the mobile Web.  As another interesting demographical stat, the report states that Hispanic and Black multi-cultural audiences continue to lead in mobile data usage in the US, with Millennial’s June rankings of the top US mobile DMAs being comprised of high multi-cultural populations.  The top 5 DMAs for June were Los Angeles, Dallas, Houston, Phoenix and Sacramento.

This month’s spotlight was on the Entertainment ad vertical, as the industry as a whole in embracing mobile in a big way.  For example, a 300% increase in DVD-release campaigns since Q2 2009 signaled recognition by movie studios that mobile advertising can be used to effectively drive results across all product release windows — i.e. motion picture releases, DVD releases, VOD and more.

In terms of engagement, Millennial is reporting that mobile Web destinations continue to represent the majority, with nearly 80% of Millennial’s entire “Campaign Destination Mix” for June.  Rich media campaigns and app-download campaigns continue to show increased movement as well.

As always, you can view the entire report for all the statistical goodies Millennial publishes.  It can be downloaded here.