Geospatial evaluation of disparities in neurosurgical access in the United States

•Neurosurgical access is geospatially varied within the United States.•The Great Plains, Rocky Mountains, and Southwest have the lowest neurosurgeon access.•Mid-Atlantic, Central Texas, and Southern Montana have greatest neurosurgeon access.•Rural-adjacent neurosurgeons service patients from surrounding, low-access counties.•Urban areas with many neurosurgeons often have proportionally less access per person.