The Rajon located in the west of the country on the border with Romania, which runs along the river Prut. In Rajon is the 430 m high Dealul Bălăneşti the highest elevation of Moldova.
In addition to the capital of Rajon Ungheni consists of the city and the communities Corneşti Agronomovca, Alexeevca, Boghenii Noi, Buciumeni, Bumbata, Buşila, Cetireni, Chirileni, Cioropcani, Condrăteşti, s.Corneşti, Cornova, Costuleni, Floriţoaia Veche, Hîrceşti, Macaresti, Măgurele, Mănoileşti, Morenii Noi, Năpădeni, Negurenii Vechi, Petreşti, Pirlita, Rădenii Vechi, Sculeni, Sinesti, Teşcureni, Todiresti, Unţeşti, Valea Mare and Zagarancea.
The neighboring districts of Ungheni are Calarasi, Falesti, Nisporeni, Sîngerei and Teleneşti.
The Rajon Ungheni exists since 2003. Until February 2003, the area belonged in common with today's Rajons Calarasi and Nisporeni the now defunct county Ungheni ( Judeţul Ungheni ).
1959 86 741 people were living in what is now Rajons. Up to 117 364 104 545 of about 110 264 in 1970 in 1979 in 1989 until 2004, as in all of Moldova decreased the population of the Rajons that was in that year 110 545 In the following decades, the population steadily increased. .
According to the 2004 census put the Moldovans at 88.5 % the proportionally largest ethnic group in Rajon Ungheni, followed by Ukrainians at 7.0 %, with 2.5% of the Russians and the Romanians at 1.5%. Smaller minorities form the Gagauz and Bulgarians, each with 0.1%.