What is the size of a standard parking spot?

It depends on the code of each state or municipality. However, here is a reference from a town in MA. # Parking area aisles in a ninety (90) degree layout shall be no less than twenty-four (24) feet wide to provide adequate width for vehicles to enter or leave parking spaces in a single motion. Aisles in a parking area using other than ninety (90) degree angles shall provide adequate width for vehicles to enter or leave the parking spaces in a single motion. # Parking space dimensions # Parking spaces in a layout other than parallel shall not be less than nine (9) feet in width and nineteen (19) feet in length. # Parking spaces in a parallel layout shall not be less than twenty four (24) feet in length, measured parallel to the travel lane, and have a width not less than nine (9) feet, perpendicular to the travel lane. Chapter 185, Section 21 of the Code of the Town of Franklin, Parking, loading and driveway requirements, is hereby amended as follows: Zoning ordinances usually dictate sizes based on vehicle size. They may vary from 8' x 18' to 10' x 20' in general. The MUTCD (Manual on Uniform traffic control devices) which is the national wide standard states the a parking space minimum is 8'x22' and 8'x20' for compact vehicles except on the ends. The end spaces in a line may be as short as 18'.