The population trend reversed in 2020, increasing to 8,000 residents. This increase could be attributed to new housing developments, changes in zoning laws, or shifts in demographic preferences towards urban living.

Data from 2022 shows a population of 7,997, indicating a slight decrease from 2021 but maintaining the neighborhood's high-density character. With an estimated 3,064 housing units, Horizon Hill likely features compact living spaces, possibly including high-rise apartments and condominiums.

The high population density suggests that residents of Horizon Hill have access to numerous urban amenities in close proximity. This may include public transportation, diverse dining and shopping options, and cultural venues. Green spaces are likely limited and heavily utilized.

Horizon Hill's high density is notable within Rockville, which is generally considered a suburban area in the Washington D.C. metropolitan region. This suggests that Horizon Hill may be a particularly dense area within a broader suburban context.

The recent population growth and consistently high density indicate that Horizon Hill remains an attractive location for urban living. It may appeal to young professionals, students, or those seeking a car-optional lifestyle with easy access to urban amenities and public transportation.