Washington, D.C.

Washington, D.C., formally the District of Columbia and commonly referred to as Washington, "the District", or simply D.C., is the capital of the United States of America.

I am Iron Man
In 2011, Tony Stark was called to Washington to appear before the Senate Armed Services Committee’s Weaponized Suit Defense Program Hearings. Though Senator Stern demanded from Stark to turn the Iron Man suit over to the military, Stark refused.

Battle of New York
After the battle of New York, Captain America settled in Washington, D.C.

Aldrich Killian's War
Not knowing that it was a show, President Matthew Ellis called the Mandarin from here in order to save the life of a Roxxon Oil Corporation accountant.

Vice President Rodriguez was with his family in Washington, D.C. when he was alerted of the Kidnapping of President Ellis, but, as an A.I.M. sympathizer, decided to do nothing.

Hunt for the Clairvoyant
After the arrest of Grant Ward for killing Thomas Nash, Melinda May told Phil Coulson that Nick Fury had returned to the Triskelion. Coulson told her that Ward's tribunal would be there.

Project Insight
After Director of S.H.I.E.L.D. Nick Fury asked World Security Council Secretary Alexander Pierce to postpone Project Insight, he was involved in a pitched battle in the streets of D.C. against HYDRA agents and the Winter Soldier.

The World Security Council came to Washington, D.C. in order to launch Project Insight, but it was stopped by Captain America, Falcon, and Maria Hill as Black Widow posted online all of S.H.I.E.L.D.'s secret intelligence. Subsequently, the Triskelion was destroyed by one of the Helicarriers, and Senate hearings were held that ultimately labelled S.H.I.E.L.D. as a terrorist organization.

S.H.I.E.L.D. Civil War
Natasha Romanoff and Maria Hill appeared at hearings at the United States Capitol after the S.H.I.E.L.D. Civil War.

After Maria Hill left a Senate hearing concerning the dissolution of S.H.I.E.L.D., she was approached by Melinda May concerning her knowledge of Project T.A.H.I.T.I. and who was its leader.

Ian Quinn went to Washington, D.C. to meet with representatives from the United States Armed Forces in order to sell them one thousand Deathlok Soldiers to fight in the war on terror.

After the battle on the Triskelion, the Winter Soldier went to Captain America’s wing of the Smithsonian, where he intensely looked at the part of the exhibit about himself, implying he was starting to remember about his past as Bucky Barnes.

Potomac Plaza
Glenn Talbot was enjoying time with his wife and son, discussing the lad's future when a hooded man bumped him. When the phone started ringing, Talbot realized that it was planted on him and told his family to flee. Talbot answered the call from Phil Coulson who warned him that he was in danger. Talbot refused to listen and called on his personal cellphone for military back-up. Suddenly, Talbot was attacked by Carl Creel. After a fist fight, Melinda May intervened, knocking Creel away from Talbot. Military back-up arrived, as the Absorbing Man tried to hit May with a ball and chain. Skye fired a Taser Projectile Launcher that stunned him. The military surrounded Creel who surrendered. Meanwhile, Isabelle Hartley, dressed as a soldier, told Talbot that she was escorting him to safety. When a Military Leader came to escort Talbot, he was already gone, kidnapped at gunpoint by Melinda May.

Trivia

 * Scenes from the film Captain America: The Winter Soldier that are set in Washington were actually filmed there, and filming took place at the National Mall and the Theodore Roosevelt Bridge.