  We analyze 3."5 resolution, high sensitivity radio continuum images of the
nearby spiral galaxy NGC 4258 at 6 and 20 cm derived from multiple observations
used to monitor the radio supernova SN 1981K (Van Dyk et al. 1992, [ApJ, 396,
1995]). Seven bright H II region and five supernova remnant candidates are
identified. Extinctions to the H II regions are estimated for the first time
from a comparison of radio flux densities to new optical fluxes derived from
H-alpha observations by Dutil & Roy (1999, [ApJ, 516, 62]). The bright end of
the H II region luminosity function is established at each wavelength. The
luminosity functions are best fit by power laws consistent with the shape of
previously published radio and optical luminosity functions for a number of
galaxies. The supernova remnants are all about 2--3 times the radio luminosity
of Cas A. In addition, the galaxy's nucleus is shown to have been variable over
the SN 1981K monitoring period. The spectral index (alpha) distribution of the
anomalous radio arms is investigated and found to be relatively uniform at
alpha = -0.65 +/- 0.10.
