populous
superpopulated
thickly settled
confining
close
crowdy
teemingly
mobbed
thick
throngful
thronged
press
crush
jam
legion
everybody and their dog
everyone and their brother
pack
school
everyone and his brother
everyone and their mother
everyone and their dog
zooey
everybody and their brother
rookery
hive
wall-to-wall
zooish
dring
heaving
overcrowdedly
horde
megapopulation
thrang
host
huddle
crowdedly
everybody and his cousin
overpopulous
jammed
heap
athrong
flock
multitudinous
thickset
in droves
close-serried
congested
pour
the whole world and his dog