It appears not to be. Here are the ones in Santa Clara County:
- Milpitas
- Mountain View
- Palo Alto Santa
- San Jose
- Sunnyvale
- Unincorporated Area (Lexington
Hills area, overlapping Santa
Clara and Santa Cruz Counties)
I don't know why it says "Palo Alto Santa"
Edit: I guess it's "Palo Alto Santa" to disambiguate between Palo Alto, which is in Santa Clara County, and East Palo Alto, which is in San Mateo County (BTW the westmost point of East Palo Alto is east of the westmost point of Palo Alto, but the eastmost point of East Palo Alto is not east of the eastmost point of Palo Alto).