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Description: Microplastic (MP) pollution threatens coastal ecosystems, particularly filter-feeding Eastern oysters (*Crassostrea virginica*). From winter 2023 to fall 2024, MPs in water and oyster tissues from the Patuxent and Potomac Rivers were analyzed using FTIR microscopy. Water MP concentrations were significantly higher in the Patuxent (558.81 ± 165.78 particles L⁻¹) than in the Potomac (351.71 ± 65.46 particles L⁻¹), whereas tissue concentrations did not differ significantly. Overall water and tissue concentrations were not significantly correlated; however, the 20–100 µm fraction showed a significant positive correlation (*r* = 0.69, *p* = 0.003). Oysters preferentially accumulated 20–100 µm MPs while excluding particles >300 µm. Fragments dominated both water and tissue samples. Polyamide was most abundant in the Patuxent, while ethylene-vinyl acetate dominated the Potomac. These findings highlight the importance of MPs <100 µm in oyster bioaccumulation, trophic transfer, and seafood exposure risk.

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