Radio-frequency absorption line observations of 20 sources were used to calibrate the relation between radio surface brightness and linear diameter. Distances for 116 SNR were derived using the new calibration. The catalog lists galactic longitude and latitude in decimal degrees, source name, flux density (in 10^-26^W/m^2^/Hz) at 1GHz, mean angular diameter of the source (arcmin), surface brightness at 1GHz, diameter of the remnant (pc), distance of the remnant (kpc), scale height from the galactic plane (pc), radial distance to the center (kpc), and references (by number given in the original publication).