People are down voting you, but I don't know why. There has been much written about the explosion of 6 figure government jobs in the last decade or two.
So roughly the same as the US population as a whole, where ~16% make > 100K. (Note that this percentage is of all workers, including part time workers. Part time workers are under represented in the federal government workforce compared to the broader workforce)
The median salary for city workers in Palo Alto is above $100k. The amusing thing is many of the jobs below $100k are meter-readers and other parking enforcement. The city runs its own utilities, etc., so has a fairly sizable workforce relative to population.