The current upper crustal and in-depth tectonic structures and evolution of the Adria microplate, located between the large Eurasian and African tectonic plates, have been the primary focus of numerous scientific publications. These studies have concluded a wide range of interpretations, some of which are contradictory, since the earliest paleotectonic models over a hundred years ago. Our main goal is to integrate tectonics and stratigraphy at the upper crust level along two regional transects with deep geophysical data to create a numerical model of the current crust and upper mantle structure at lithospheric scale. Additionally, the results indicate a minimum width of the Adria microplate. The two lithospheric transects through Adria document its deep structure with two sets of limited lithospheric slabs, possibly only the continental part under the Apennines and Dinarides and with opposite dips. In addition, the Ionian oceanic subduction to the north under the Tyrrhenian Sea may correspond to the oceanic part corresponding to the continental delaminated slabs under the Apennines and still connected to the westernmost end of Calabria. Along the southern transect, using already published structural cross-sections, we determine a total shortening of about 300 km, distributed in almost equal parts between the Apennines and Dinarides fold belts. These values allow the reconstruction a minimum width of the Adria microplate of 1050 km before middle-late Jurassic, and thus before its deformation during the long-lasting closure of the complex Neotethys Ocean basins.