  We present a study on the possible association of unidentified $\gamma$-ray
sources in the Third EGRET (3EG) catalog with different types of galactic
objects such as Wolf-Rayet and Of stars, supernova remnants (SNRs), and OB
associations (considered as pulsar tracers). We have made use of numerical
simulations of galactic populations of $\gamma$-ray point sources in order to
determine the statistical significance of the positional coincidences. New
constraints on pure chance association are presented for SNRs and OB
associations, and it is shown that massive stars present marginally significant
correlation with 3EG sources at a $3\sigma$ level.
