The documents about Alagastesheim and Bergen (Laurenziberg) in the lists of holdings from the Lorsch and Fulda Abbeys beginning in 766-767 allow inferences about cropraising, livestock raising, winegrowing, fruitgrowing and individual inhabitants’ wealth.

Eventually, for over 400 years, from the latter half of the 14th century until the end of the Old Empire, there arose the Amt of Algesheim under the governance of Amtmänner, Landschreiber, Amtskeller (all titles for various officials) and Schultheißen (roughly “sheriffs”) of the Mainz overlords.

Eickemeyer gave the community a modern shape by reforming fire control, restructuring finances, expanding the town's building work, and furthering schooling and agriculture.

The Rheinischer Volksbote (“Rhenish Messenger”), first published by the printer Reidel in 1869 and under Father Koser's editorship, was for decades a regionally important organ of the Catholic Centre Party.

A teacher preparation institute (an institution that prepared students for teacher's college), known to locals as the Lateinschul (“Latin School”) or the Aljesemer Hochschul (“Algesheim College”, in dialectal German), a childcare centre, a credit and savings union on a coöperative basis, a farmers’ and consumers’ association, and not least of all the newly built Catholic parish church and the establishment of church music in 1888 confirm Peter Koser's religious and sociopolitical contributions in a time of political and ideological struggles.

After the dissolution or banning of democratic political parties and ecclesiastical associations, and the Gleichschaltung of clubs, opponents of National Socialism were progressively isolated and intimidated.

In the context of the dispute over the Reichskonkordat between the German Empire and the Roman Curia, members of the Centre, and also two Social Democrats, were defamed as separatists and traitors to the Fatherland, resulting in their being delivered to Osthofen Concentration Camp.

The 600th anniversary of Gau-Algesheim's elevation to town in 1355 was recalled by a days-long festival in the summer of 1955, which formed the high point, and indeed the completion of the phase of reconstruction and restoration of traditional structures.

Within a few years, the roadbridge (Bundesstraße 41) over the railway line (1957), the cycling sport hall (1960), the new Catholic kindergarten (1961) and the expansion of the Albertus-Hospital (1962) and the primary school (1963) changed the town's face.

The town's arms might be described thus: Gules a cross crosslet pattée couped top and bottom by a wheel in each of chief and base spoked of six lozengy argent.