OCN: Optical Carrier Level N: OCN: Operational Carrier Number: OCN: Open Communications Networks Inc. OCN: Operations Control Number: OCN: Office Control Number: OCN: Owning Company Number (LEC calling cards) OCN: Original Call Number: OCN: Operational Company Number: OCN: Oceanography: OCN: Open College Network: OCN: Original Cost New: OCN: Office of Child Nutrition: OCN