Using assessor data, municipal zoning data, and visual inspection of aerial imagery, this study concludes that about 13 percent of the land area in Silicon Valley cities is devoted to parking, and that more than half of the average commercial parcel is parking space. This latter fact suggests that minimum parking requirements, if binding, depress Silicon Valley’s commercial and industrial densities, and thus its economic output. In an exploratory empirical exercise, we simulate a reduction in parking requirements from the year 2000 forward and show that under conservative assumptions the region could have added space for nearly 13,000 jobs, equivalent to a 37 percent increase over the actual job growth that occurred during that time. These additional jobs would be disproportionately located in the region’s highest-wage zip codes and could add more than $1 billion in payroll annually, further implying a large productivity gain.