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This study documents expression of dopamine (DA) receptors on leukocyte subpopulations using flow cytometric techniques to identify dopamine receptors with subtype-specific antibodies. Of the D1-like receptor family (D₁ and D₅), only D₅ was detected, and of the D2-like receptor family (D₂, D₃ and D₄), all dopamine receptors were detected. T-lymphocytes and monocytes had low expression of dopamine receptors, whereas neutrophils and eosinophils had moderate expression. B cells and NK cells had higher and more consistent expression. Dopamine receptors D₃ and D₅ were found in most individuals whereas D₂ and D₄ had more variable expression. D₁ was never found.