This dataset includes the numerical model input files used to generate the simulation presented in "Assessing Vertical Coordinate System Performance in the Regional Modular Ocean Model 6 configuration for Northwest Pacific" To run the model using these files, most should be placed in an INPUT/ directory within the working directory. However, the following files—data_table, diag_table, field_table, and input.nml—should be located at the top level of the working directory. For large datasets, a time-limited subset is provided for the first year of the simulation. Please note that this dataset does not include ERA5 atmospheric forcing data, which can be accessed separately at https://doi.org/10.24381/cds.adbb2d47.