Section 2 of the Shalya Parva of Mahabharat mentions the kings whose support Duryodhan had in the great war:
This wide earth is as much ours as it is of Pritha's son. Bhagadatta and Kripa and Shalya and the two princes of Avanti and Jayadratha and Bhurishrava and Sala and Somadatta and Bahlika and Ashvatthama and the chief of the Bhojas and the mighty prince of Magadha and Vrihadvala and the ruler of the Kasi and Shakuni the son of Subala and many thousands of Mlecchas and Sakas and Yavanas, and Sudakshina the ruler of the Kambojas and the king of the Trigartas and the grandsire Bhishma and Bharadwaja's son and Gotama's son (Kripa) and Srutayush and Ayutayush and Satayush of great energy, and Jalasandha and Rishyasringa's son and the Rakshasa Alayudha, and the mighty-armed Alambusa and the great car-warrior Subala--these and numerous other kings, O best of monarchs, have taken up arms for my sake, prepared to cast away their very lives in great battle, stationed on the field amidst these, and surrounded by my brothers, I will fight against all the Parthas and the Pancalas and the Cedis, O tiger among kings, and the sons of Draupadi and Satyaki and Kunti-Bhoja and the rakshasa Ghatotkaca.
Do we have more details about the kings mentioned by Duryodhan and their respective kingdoms (with geographical location)? I am not interested in a complete list of kings that fought the war just the ones who supported Duryodhan.