Recently our local city emergency services partnered with Smart 911 to improve emergency response, becoming the first city in Northern California to implement the system. The system allows citizens to proactively provide important information about yourself and your family to the 911 center before an emergency happens. The system is tied to your phone number so even if you call from a cell phone, if it's registered in the system, they will have your information. You can give them as much or as little information as you are comfortable giving.
From Smart911.com: Smart911 allows you to proactively provide details on your family and home that 9-1-1 may need in order to send help in the event of an emergency. It is private and secure, and funded by local municipalities and 9-1-1 centers so that it is free to you. Smart911 is endorsed by citizens, community groups and public safety officials. While not yet deployed everywhere across the U.S., its availability is growing daily. Even if it is not yet in your area, it will work anywhere you travel.