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We characterize the binary population in the young and nearby OB associationScorpius OB2 using available observations of visual, spectroscopic, andastrometric binaries with intermediate-mass primaries. We take into accountobservational biases by comparing the observations with simulated observationsof model associations. The available data indicate a large binary fraction (>70% with 3sigma confidence), with a large probability that all intermediatemass stars in Sco OB2 are part of a binary system. The binary systems have amass ratio distribution of the form f(q) ~ q^-0.4. Sco OB2 has a semi-majoraxis distribution of the form f(log a) ~ constant (Opik's law), in the range5-5e6 Rsun. The log-normal period distribution of Duquennoy & Mayor results intoo few spectroscopic binaries, even if the model binary fraction is 100%. ScoOB2 is a young association with a low stellar density; its current populationis expected to be very similar to the primordial population. The fact thatpractically all stars in Sco OB2 are part of a binary (or multiple) systemdemonstrates that multiplicity is a fundamental factor in the star formationprocess, at least for intermediate mass stars.

The primordial binary population II: Recovering the binary population for intermediate mass stars in Sco OB2