is Mormonism still practiced?

Yes it is. In fact, in 2012, the Republican candidate for president, Mitt Romney, was (and is) a Mormon. The home of the LDS church (Church of Jesus Christ of Latter-Day Saints) is in Salt Lake City, Utah; but there are Mormon houses of worship in many states of the United States, and Mormons send missionaries to share their faith all over the world.

Another Answer:

Yes! As of 2013, there are over 14.5 million members of the Church of Jesus Christ of Latter-day Saints (the "Mormon" church) around the world. Mormon congregations are in every state of the United States and nearly every nation (a handful of strict communist and Middle Eastern nations exluded). The practice of Mormonism has only increased since it was founded in 1830.