I have a book with the electoral maps for the last two German elections of the Wiemar era. The map looks pretty familiar in that the socialist constituencies were mostly in the north and east while the conservative constituencies were in the south and west. SPD, the traditional German socialist party, won those constituencies in the previous election, but the Nazis took those constituencies away from SPD this election.
So much for the myth the Nazis weren't real socialists but were conservatives. No, it was socialist voters who handed them their plurality.