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If you include its atmosphere, Pluto is larger than Earth. Michael Simons at New Horizons explains how this can be.

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DISCUSSION

Can't say that's something that ever occurred to me before, but it does make sense. That far from the sun the solar wind is going to be far weaker than it is in our neck of the solar woods. weaker magnetic storms weaker solar wind would, I would think, make it easier for Pluto to gravitationally hold onto gas and dust particles, allowing for a much larger atmosphere than would be possible for a rocky body of the same size closer to the sun.

The title of the article is still a little misleading, if technically correct. From a pure volume perspective, yes, Pluto would be larger, but in terms of raw mass and density the poor thing isn't ever going to be close.