In 1927 the two communities of Osterholz and Scharmbeck were merged under the name of Osterholz-Scharmbeck and in 1929 town privileges were granted.
1927. aastal liideti Osterholzi ja Scharmbecki omavalitsused Osterholz-Scharmbecki nime all ja 1929. aastal anti linnaõigus.