We have combined radio continuum observations of the giant spiral galaxy NGC~6946 at 20 and 6 cm made with the VLA in various array configurations, which were originally used to monitor the radio supernova SN~1980K (Weiler et al.~1986, 1992). The maps we derive from this dataset are of superior signal-to-noise ($\sigma \simlt 0.04$ mJy/beam at 20 cm) and spatial resolution ($\sim 4$'' at 20 cm) to those previously published by other investigators. We present a preliminary atlas of individual thermal and nonthermal sources, including flux densities and spectral indices, and make a comparison with optical H$\alpha$ maps (e.~g., Bonnarel et al.~1986). In particular, we identify the radio counterpart to the very luminous X-ray supernova remnant (Schlegel 1993), which is $\sim 2000$ times more powerful than Cas~A in the radio. We also give an upper limit for the large scale nonthermal cosmic ray background of the galaxy.