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Over large portions of the Milky Way, the WISE catalog is now statistically complete for all HII regions ionized by single O-stars. With such a catalog, we can begin to examine the overall Galactic HII region population, and to compare massive star formation in the Milky Way with that of external galaxies. Our current investigations include the z-distribution of massive star formation regions and the Sun's height above the midplane, the form Galactic HII region luminosity function, massive star formation in the far outer Galaxy, the Galactic electron temperature gradient, a strange cluster of HII regions near to the Galactic center, the distribution of ionized gas in the inner Galaxy, and the luminosity and star formation rate of the Milky Way.