I think you mean the rise of national-socialism, not so much of fascism in pre-war Germany, but putting that aside for a moment;

The first electoral breakthroughs enjoyed by the Nazis came in Protestant rural areas, such as Schleswig-Holstein and Lower Saxony, where peasant voters had earlier registered discontent with their traditional representatives from the DNVP (German National People's Party or Nationalists). In fact this was more than a little ironical, as Nazi propaganda had initially targeted urban workers, and the Nazi agrarian programme developed in 1928 was only in response to the expansion of support in these areas. Subsequently the constituencies with the highest proportion of Nazi voters were in Protestant farming communities; and by 1932 the stream of peasant deserters to Hitler's party had become a torrent. Many rural labourers, often influenced by the estate managers, voted for the NSDAP in July 1932. Indeed, the scale of agrarian support for the party in that election suggests the Nazis were able not only to win the support of peasants and rural labourers but also that of some large landowners.

Voters in large urban centres were less susceptible to Nazi electoral propaganda. In July 1932, the NSDAP's support in the Grosstadte (over 100,000 inhabitants) was 10 per cent lower than the national average. Though there had been a significant increase in support among German workers between 1930 and 1932, this was less marked in the larger cities; and nearly half the working-class newcomers to the party ranks between 1925 and 1932 came from villages of under 5,000 inhabitants. And proportionally few of the working-class storm-troopers of the SA came from the big cities.

In part this pattern reflects the point that Hitler and his followers were able to build support in small provincial towns and rural areas more effectively than in the large cities precisely because political mobilisation was less developed in the provinces and the countryside. SPD (Social Democrat) and KPD (Communist) support had been and was still concentrated in the big cities, and the electoral drive of the NSDAP encountered powerful traditions and loyalties there. This urban/rural divide was reinforced by another factor: the Nazis were relatively unsuccessful in gaining the electoral support of the unemployed, who were also concentrated in Germany's largest cities.

Source/much more : Dick Geary, Professor of Modern History at the University of Nottingham.