
Red zones are “No Parking” zones. Do not park in a red zone at any time, under any circumstances. Watch for red zones at:

White zones are for passenger loading and unloading during certain hours with a time limit of five minutes. Check nearby signs or stencils on the curb for effective hours.
The driver must remain with the vehicle at all times (limited exceptions apply at preschools and hospitals).
White zones are typically used for:

Green curbs are for short-term parking, generally less than 10 minutes. Standard effective hours are 9:00 am to 6:00 pm, Monday through Saturday.
In metered areas, green meters will have either a 15 or 30 minute time limit.
Vehicles bearing disabled placards or plates are exempt from the time limits for green curbs/meters.
Green curbs/meters are typically used for:

Yellow zones are for active freight loading and unloading only by commercial vehicles. Check nearby signs or stencils on the curb for effective hours. Vehicles without a commercial license plate parked in a yellow zone will be cited and can be towed if the sign specifies it is a tow zone.
Six-Wheel Truck Loading Zones are indicated by signs only. When signed for six wheels or more, such trucks can use the zone. Six wheel loading zones can typically be distinguished by their red-capped meters in metered areas.
Yellow zones are typically used for large businesses or properties that receive or deliver a lot of shipments.

Blue zones are parking spaces for people with a valid disabled parking permit. They are effective 24/7 except for street cleaning or when restricted by a special event or construction permit.
Never block access to a blue zone or park in one without a valid placard/permit. The fine is severe and your vehicle may be towed.
Blue zones are normally located in areas with high public use, such as:
Here's a list of blue zones on public streets.