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We present a comprehensive catalog of observations and stellar populationproperties for 23 highly secure host galaxies of fast radio bursts (FRBs). Oursample comprises six repeating FRBs and 17 apparent non-repeaters. We present82 new photometric and eight new spectroscopic observations of these hosts.Using stellar population synthesis modeling and employing non-parametric starformation histories (SFHs), we find that FRB hosts have a median stellar massof $\approx 10^{9.9}\,M_{\odot}$, mass-weighted age $\approx 5.1$ Gyr, andongoing star formation rate $\approx 1.3\,M_{\odot}$ yr$^{-1}$ but span wideranges in all properties. Classifying the hosts by degree of star formation, wefind that 87% (20/23 hosts) are star-forming, two are transitioning, and one isquiescent. The majority trace the star-forming main sequence of galaxies, butat least three FRBs in our sample originate in less active environments (twonon-repeaters and one repeater). Across all modeled properties, we find nostatistically significant distinction between the hosts of repeaters andnon-repeaters. However, the hosts of repeating FRBs generally extend to lowerstellar masses, and the hosts of non-repeaters arise in more optically luminousgalaxies. While four of the galaxies with the most clear and prolonged rises intheir SFHs all host repeating FRBs, demonstrating heightened star formationactivity in the last $\lesssim 100$ Myr, one non-repeating host shows this SFHas well. Our results support progenitor models with short delay channels (i.e.,magnetars formed via core-collapse supernova) for most FRBs, but the presenceof some FRBs in less active environments suggests a fraction form through moredelayed channels.

The Demographics, Stellar Populations, and Star Formation Histories of Fast Radio Burst Host Galaxies: Implications for the Progenitors