Denmark uses population registers. A person is classified as Iranian-origin if they are:
The descendant category requires that neither parent is a Danish citizen born in Denmark. Third-generation (both parents Danish-born citizens) are not counted as Iranian-origin.
Source: Statistics Denmark (DST) — Population Register, 2026
Source: Statistics Denmark (DST) — Population Register, 2026
Source: Statistics Denmark (DST) — Population Register, 2026