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The Spitzer Survey of Stellar Structure in Galaxies (S4G) is a volume,magnitude, and size-limited survey of 2352 nearby galaxies with deep imaging at3.6 and 4.5um. In this paper we describe our surface photometry pipeline andshowcase the associated data products that we have released to the community.We also identify the physical mechanisms leading to different levels of centralstellar mass concentration for galaxies with the same total stellar mass.Finally, we derive the local stellar mass-size relation at 3.6um for galaxiesof different morphologies. Our radial profiles reach stellar mass surfacedensities below 1 Msun pc-2. Given the negligible impact of dust and the almostconstant mass-to-light ratio at these wavelengths, these profiles constitute anaccurate inventory of the radial distribution of stellar mass in nearbygalaxies. From these profiles we have also derived global properties such asasymptotic magnitudes (and the corresponding stellar masses), isophotal sizesand shapes, and concentration indices. These and other data products from ourvarious pipelines (science-ready mosaics, object masks, 2D imagedecompositions, and stellar mass maps), can be publicly accessed at IRSA(http://irsa.ipac.caltech.edu/data/SPITZER/S4G/).

The Spitzer Survey of Stellar Structure in Galaxies (S4G): Stellar Masses, Sizes and Radial Profiles for 2352 Nearby Galaxies