Nark:
Here are some non-trinitarian denominations. There are others.
American Unitarian Conference
Various Bible Student churches (Dawn Bible Students, Friends of the Nazarene, etc.)
Christ Fellowship Ministries
Christadelphians
Christian Church of God
Christian Educational Services, or Biblical Unitarians
Christian Science
Church of God General Conference
Church of God of the Abrahamic Faith, or Church of the Blessed Hope
Various Congregationalist churches
Doukhobors
General Assembly of Unitarian and Free Christian Churches
Godfellas
Harvest Herald Ministry
Jehovah's Witnesses
Light of Christ Ministries
Megiddo Church
Molokans
Mormons
Various non-denominational churches
Path of Christ Ministry
Quakers
Religious Science International
Scientology
Spiritualist churches
Unification Church
Unitarian Christian Church
Unitarian/Universalist Association
United Church of Christ
United Pentecostal Church
Unity churches