N11 is a three-digit shortcut to reach special community services. The numbers are set aside by the Federal Communications Commission (FCC) and operated by the provider of the special community service.
For example, the Washington Department of Transportation pays for and operates the 511 service describing road and traffic conditions.

This is what each N11 code is used for:

• 211 Public, health, and community services.
• 311 Non-emergency police, fire and municipal business. Local and municipal governments will administer 311 calls.
• 511 Road and traffic conditions. The state department of transportation or designated local departments of transportation will administer 511 calls in most cases.
• 711 Telecommunications Relay Service (TRS) for the speech and hearing impaired.
• 811 Call before you dig number arranges for utilities to be located and marked.
• 911 Emergency response.

CenturyTel - UT-061321 - (211, 311, 511 and 711).

Embarq - UT-041092 (211, 311, 511 and 711).

Qwest - UT-030263 (211, 311, 511 and 711) and UT-051356 (811).

Verizon - UT-031039 (511) and UT-060023 (211).