So this map may be informative on the real size of the Stanford University Campus https://campus-map.stanford.edu/.

The campus includes zones for traditional classrooms, agricultural, residential, hospital, shopping center, commercial real estate, hazardous industrial areas and so forth. The area is a Venn diagram of governments controlling parts of the campus land, which includes: 2 counties, 2 city limits, a census designated area, state property (I-280) and unincorporated areas. This distinction is important because the areas overlap.

To reduce confusion, it's probably better to state that the Stanford University Campus reflects the Stanford University map with some tweaks from the Santa Clara County Tax Assessor, which has more precise property lines within the county.