| UA | United Artists 
| Others |
| UA | United Association
| Others |
| UA | United Atom
| Others |
| UA | Uniting Ambition
| Others |
| UA | Universal Access
| Others |
| UA | Universal Accessibility
| Others |
| UA | Universal Army
| Others |
| UA | Universe of Actions
| Others |
| UA | Universidad de Alicante
| Others |
| UA | University Affairs
| Others |
| UA | University Australia
| Others |
| UA | University of Alabama
| Others |
| UA | University of Arizona
| Others |
| UA | Unknown Armies
| Others |
| UA | Unlimited Access
| Others |
| UA | Unlimited Adventures
| Others |
| UA | Unlimited Ammo
| Others |
| UA | Unmanned Aircraft
| Others |
| UA | Unnumbered Acknowledge
| Others |
| UA | Unnumbered Acknowledgement
| Others |
| UA | Unreal Annihilation
| Others |
| UA | Unstable Angina
| Others |
| UA | Unstoppable Alliance
| Others |
| UA | Up Armor
| Others |
| UA | Update Attribute
| Others |
| UA | Update Australia
| Others |
| UA | Upper A
| Others |
| UA | Upper Airway
| Others |
| UA | Upper Arm
| Others |
| UA | Upper Austria
| Others |
| UA | Urban Agglomeration
| Others |
| UA | Urban Animals
| Others |
| UA | Urban Apps
| Others |
| UA | Urban Arcana
| Others |
| UA | Urbanized Area
| Others |
| UA | Urchin Account
| Others |
| UA | Uric Acid
| Others |
| UA | Urinalysis
| Others |
| UA | Urinary Albumin
| Others |
| UA | Urinary Analysis
| Others |
| UA | Urine analysis
| Others |
| UA | Uronic Acid
| Others |
| UA | User Acquisition
| Others |
| UA | User Agent
| Others |
| UA | User Authored
| Others |
| UA | Uterine Activity
| Others |
| UA | Uterine Artery
| Others |
| UA | Uterine Aspiration
| Others |
| UA-05 | Vinnytska oblast, Ukraine
| Others |
| UA-07 | Volynska oblast, Ukraine
| Others |