The Brentwood-Darlington Neighborhood Association dates to 1974 when it was founded as the Errol Heights Improvement Association, serving the neighborhoods of Errol Heights, Brentwood, Darlington, Harney Park, Woodmere, and Crystal Springs.

The resents of the area identify as 72.0% White, 10.4% Asian, 3.6% Black, 1.6% American Indian, and 5.4% are mixed race.

The streets were divided into a grid pattern with long blocks with many of the roads leading to the nearby town of Milwaukie rather than Portland.

As an unincorporated neighborhood of Portland many homes were inadequately constructed and roads in a state of disarray due to the lack of services in the area.

Brentwood-Darlington received many attempts of annexation into Portland in 1961, 1971, and 1977 but the efforts made failed due to opposition of the residents of the area.