What is the emergency number to contact emergency services in the United States?

The emergency number to contact emergency services in the United States is 911. This number is specifically designated for urgent situations requiring immediate assistance from police, fire, or medical services. When a caller dials 911, they are connected to an operator who can quickly assess the situation and dispatch the necessary emergency responders.

In contrast, the other options serve different purposes or are relevant in other countries. For instance, 411 is typically used for directory assistance and not for emergency services. The number 999 is used in the United Kingdom for emergencies, while 112 is the emergency number in many parts of Europe and can also be used to reach emergency services in the U.S. if no local emergency numbers are accessible. However, in the context of the U.S., 911 is clearly the correct and widely recognized number for emergency assistance.