  We study the phenomenology of a vector dark matter (VDM) in a $U(1)_X$ gauged
extension of the Standard Model (SM) which is connected to the type II seesaw
framework via the Higgs portal. When this $U(1)_X$ symmetry is spontaneously
broken by the vacuum expectation value (VEV) of a complex scalar singlet, the
gauge boson $Z^\prime$ becomes massive. The stability of the dark matter (DM)
is ensured by the introduction of an exact charge conjugation symmetry. On the
other hand, the $SU(2)_L$ triplet scalar generates light neutrino masses
through the type II seesaw mechanism. We have studied the phenomenology of the
usual WIMP DM considering all possible theoretical and experimental constraints
that are applicable. Due to the presence of triplet scalar, our scenario can
accommodate the observed $2\sigma$ deviation in $h \to Z \gamma $ decay. We
have also briefly discussed the possibility of non-thermal production of DM
from the decay of the same complex scalar that is responsible for the breaking
of this $U(1)_X$ symmetry.
