Route 16G operates between the neighborhood of Arlington Mill and Pentagon City station, providing local stops through Columbia Pike.

The 16H serves a portion of Leesburg Pike to expand service to the marketplace of Skyline City.

[4] These routes runs between Pentagon City Station and the neighborhood of Arlington Mill.

Although WMATA recognized the neighborhood as Columbia Heights West, instead of Arlington Mill.

The Four Mile Run segment was discontinued, and route 16W continues to serve Skyline City via South George Mason Drive.

The Four Mile Run segment was discontinued, and route 16W is rerouted to South George Mason Drive.

[8] The first option was to extend to Skyline City via Jefferson Street, Leesburg Pike and George Mason Drive to Seminary Road.

The second option was to extend to Northern Virginia Community College (Alexandria Campus) via Jefferson Street and Leesburg Pike.

The Columbia Pike–Pentagon City Line began to modify service, by simplifying routes into different portions.

Route 16K which served between the neighborhood of Arlington Mill and Pentagon Station was discontinued on June 24, 2018.

[12][13] During WMATAs 2024 Fiscal Year budget, the proposed 16G and 16H consolidation was brought back up, except it would be extended to Crystal City and be renamed into Route 16M.

[14] During the COVID-19 pandemic, the route began operating on its Saturday supplemental schedule beginning on March 16, 2020.