US Citizenship and Immigration Services (USCIS):

Telephone: 1-800-375-5283
USCIS Home Page
InfoPass
Online Case Tracking
USCIS Photo Guidelines
Change of Address
USCIS Civil Surgeon Locator
100 Questions(English)
100 Questions(Spanish)
100 Questions(Chinese)

US Immigration and Customs Enforcement (USICE):

USICE Home Page

U.S. Customs and Border Protection Homepage (USCBP):

USCBP Home Page

Department of State (DOS):

DOS Home Page
DOS Forms
DOS - Visa Bulletin

Department of Labor (DOL):

DOL Home Page
DOL Processing Time
Prevailing Wage
PERM Online System

California Employment Development Department (EDD):

EDD CalJOBS Job Listing
EDD California Labor Market Information

Department of Justice:

US Embassies and Consulates