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We present microlens parallax measurements for 21 (apparently) isolatedlenses observed toward the Galactic bulge that were imaged simultaneously fromEarth and Spitzer, which was ~1 AU West of Earth in projection. We combinethese measurements with a kinematic model of the Galaxy to derive distanceestimates for each lens, with error bars that are small compared to the Sun'sGalactocentric distance. The ensemble therefore yields a well-definedcumulative distribution of lens distances. In principle it is possible tocompare this distribution against a set of planets detected in the sameexperiment in order to measure the Galactic distribution of planets. Sincethese Spitzer observations yielded only one planet, this is not yet possible inpractice. However, it will become possible as larger samples are accumulated.

Pathway to the Galactic Distribution of Planets: Combined Spitzer and Ground-Based Microlens Parallax Measurements of 21 Single-Lens Events