The attack came as the Hached al-Chaabi, a pro-Iranian paramilitary alliance opposed to the US presence in Iraq, staged a military parade near Baghdad in the presence of senior officials.
The drone attack happened overnight, the Kurdistan counterterrorism unit said, with two people hitting a house and causing damage while the payload of the third failed to explode.
The US consulate condemned the attack in a tweet, saying “this attack represents a flagrant violation of Iraqi sovereignty.”
US interests in Iraq have come under repeated attacks in recent months, but the use of drones is a relatively new tactic.
The United States systematically accuses Iraqi factions linked to Iran for rocket and other attacks on Iraqi facilities housing its personnel.
So far this year, there have been 43 attacks against US interests in Iraq, where 2,500 US troops are deployed as part of an international coalition to fight the jihadist group Islamic State.
The vast majority were bombs against logistics convoys, while 14 were rocket attacks, some of which were claimed by pro-Iranian factions that aim to pressure Washington to withdraw all its troops.
In April, a drone loaded with explosives struck the Iraqi coalition headquarters in the military section of Arbil airport, the Iraqi Kurdish regional capital.
The tactic poses a puzzle for the coalition, as drones can evade air defenses.
In May, a drone loaded with explosives struck the Ain Al-Asad air base housing US troops.
On June 9, three drones loaded with explosives targeted Baghdad airport, where US soldiers are also deployed. One was intercepted by the Iraqi army.
Earlier today, five rockets were fired at Balad Air Base, where US contractors are based, with no casualties or damage.
The attacks on the airport and Balad came as Iraqi authorities released Commander Hashed Qassem Muslah.
Muslah was arrested on May 26 by police on suspicion of ordering the murder of Ihab al-Wazni, a pro-democracy activist who was shot and killed earlier this month by unidentified gunmen on motorcycles.
On Saturday, Hashed, which analysts say has become the predominant force in Iraqi politics, staged a military parade in Diyala province, on the border with Baghdad.
It was the seventh anniversary of the group which fought in 2014 the jihadist group EI which had seized nearly a third of Iraq in a lightning offensive.
During the parade, Hashed displayed various weapons, including vehicle-mounted rocket launchers, according to footage broadcast by Iraqi State TV, to an audience consisting of Prime Minister Mustafa al-Kadhemi.
