The Commercial Bank of Ethiopia says that it has resumed financial services in Shire, Alamata and Korem, allowing people to deposit money and receive funds from abroad.
The announcement comes after the federal government and Tigrayan rebels signed a peace deal on 2 November that would reopen access to Tigray, which has been severely limited during the two-year conflict.
The United Nations says the conflict has displaced more than two million people and driven hundreds of thousands to the brink of famine.
The UN World Food Programme, says more than 13 million people in northern Ethiopia now depend on humanitarian aid, including more than 90 percent of Tigray's population of six million.