Hong Jin-wook, the ministry's director general for Middle East affairs and head of the delegation, held meetings with Brad Smith, the deputy director of the Office of Foreign Assets Control at the Treasury Department, and Nick Stewart, an official of the State Department, on Thursday, Yonhap reported.
The delegation's visit to Washington came after another South Korean delegation visited Tehran on Monday and Tuesday for consultations over the resumption of humanitarian trade exempt from anti-Iran sanctions.
"The two sides positively evaluated the results of the delegation's visit to Iran and agreed to accelerate follow-up consultations over the resumption of medical and other (humanitarian) exports to Iran," the ministry said in a press release.
South Korea has reportedly sought to export humanitarian products to Iran through a mechanism similar to the Swiss Humanitarian Trade Arrangement, which is a payment method designed to facilitate Swiss companies' sales of food and medicine to Iran.
Though humanitarian exports are not subject to sanctions, South Korean firms had difficulty resuming their sales of medicines and other products to Iran due to fears that they could be affected by the sanctions.