  We report on sensitive radio observations made with the VLA at 8.5 GHz,
centered on the Hubble Deep Field (HDF). We collected data in the A, CnB, C,
DnC, and D configurations, corresponding to angular resolutions ranging from
0.3" to 10". We detected 29 radio sources in a complete sample within 4.6' of
the HDF center and above a flux density limit of 9.0 microjy (5 sigma). Seven
of these sources are located within the HDF itself, while the remaining 22
sources are covered by the Hubble Flanking Fields (HFFs) or ground based
optical images. All of the sources in the HDF are identified with galaxies with
a mean magnitude R = 21.7, while the mean magnitude of the identifications
outside the HDF is R = 22.1. Three radio sources have no optical counterparts
to R = 27. Based on a radio and optical positional coincidence, we detected an
additional 19 radio sources in this field (seven of which are contained in the
HDF) with 6.3 microjy < S < 9.0 (3.5 sigma < S < 5 sigma) and and R < 25, but
which are not included in the complete sample.
  At least 2/3 of the optical identifications of these microjansky radio
sources are with disk systems (i.e., irregulars, mergers and spirals). We
briefly discuss the possible physical mechnisms driving the strong evolution in
the microjansky radio galaxy population. [truncated]
