You would be quite surprised at the number of gated communities within the Denver metro area. Most are single family homes, but some are patio homes or townhomes. This list only includes neighborhoods that are gated, not those individual acreage properties with a gate at their entry. If you are looking for a property in a gated community, let me know, I can find it!
Many times you won't find any listings in most of these communities, so here is the list of active listings in a gated community in the Denver Metro area. This link will give you all gated communities within the Denver Metro area, but within this search, you can narrow your choices down to cities or counties and by price.
I have listed them by the City they are located in -
Cottage Grove (condos/townhomes)
Reunion (homes backing to golf course)
Grant Ranch (there is a small area)
Cherry Creek Vista (just the larger homes)
Palomino Park (condos & townhomes)
There is a section of Roxborough that is gated also.