Abbess,
    Christian Orthodox       
Abbot,
    Christian Orthodox        
Accountant        
Acting Official       
Adjutant General     
Admiral         
Admiral, Texas Navy   
Adventist Minister       
Alderman         
Archbishop, Catholic        
Archbishop,
   Christian Orthodox        
Archdeacon, Episcopal        
Archimandrite        
Architect
Archpriest        
Ambassador, Goodwill
Ambassador of one country
   to another country      
Ambassador of the U.S.
   to another country
   by a U.S. citizen       
Ambassador of the U.S.
   to the U.K.  
American Indian Chief        
Assemblyman
   U.S., State / or           
   Assemblywoman            
Assistant Secretary
Associate Justice,
   U.S. Supreme Court          
Associate Justice of a
   State Supreme Court
Astronaut      
Attorney         
Attorney General           
Attorney General,
       Assistant   
Attorney, U.S.         
Australian Officials    
Awards, Name on an

Baron, Baroness           
British Officials,
   Royalty, Nobility     
Brother, Catholic         
Brother,
   Christian Orthodox          
Bishop, Catholic            
Bishop,
   Christian Orthodox         
Bishop, Episcopal        
Board Member     
Boy        
Brigadier General       
Business Cards      

Canadian Officials    
Candidate    
Captain,
   USA, USAF, USMC     
Cardinal             
Certificate, Name on a 
Chairman
    Federal Reserve      
Chairwoman      
Chancellor      
Chaplain in the
    Armed Services        
Chaplain of Congress          
Chargé d’Affaires         
Chief Executive Officer 
Chief Judge          
Chief Justice,
      U.S. Supreme Court 
Chief Justice, of a State
      Supreme Court             
Chief of Police          
Chief of Staff     
Chief Operating
   Officer          
Child            
Chiropractor     
City Manager    
Clergy & Religious
    Officials     
Club Official          
Colonel, Kentucky      
Colonel, USA, USAF,
    or USMC     
Commandant       
Commissioner, Court     
Commissioner         
Commodore of a         
      Yacht Club         
Congressman, U.S.               
Congresswoman, U.S.   
Consul and or
   Consul General    
Consultant      
Corporate Executive         
Councilman
    Councilwoman      
Counselor (Diplomat)      
Countess     
County Officials       
Couples     
    U.S. Military
    U.S. Officials
    Private Citizens    
    Same Sex
Curator        

Dalai Lama          
Deacon         
Dean, academic            
Dean, clergy            
Deceased Persons        
Degree, honorary      
Delegate, U.S., State            
Dentist             
Deputy Chief of Mission
Deputy Marshal
Deputy Secretary      
Designate, Elect,
    Pro Tempore      
Diploma, Name on a   
Diplomats      
Director      
District Attorney           
Doctor, Chiropractor     
Doctor of Dentistry           
Doctor of Medicine              
Doctor, Military           
Doctor of
   Veterinary Medicine          
Doctor, Optometrist   
Doctor of Osteopathy            
Doctor, Other Disciplines     
Doctorate        
Doctorate, honorary      

Earl            
Elect, Designate
   Pro Tempore      
Emeritus/emerita      
Eminence     
Emperor    
Engineer    
Esquire, Esq.       
Excellency           

Family     
Fiancee      
Firefighter    
First, Second,
   Third , etc .        
First Lady, Spouse
   of the President of
   the United States 
First Lady, Member
    of Her   
    White House Staff      
First Lady, Spouse
   of a U.S. Governor
   or Lt. Gov.    
First Lady, Spouse
   of a U.S. Mayor    
First Lady
   of a Church      
First Lieutenant   
Former Officials    
Freeholder       

Gay Couple      
Geshe
General
    USA, USAF, USMC
Girl       
Goodwill Ambassador      
Governor General         
Governor, Lieutenant 
Governor, Lt., Spouse   
Governor, Tribal Council          
Governor, U.S. State       
Governor, Former    
Governor
    Spouse of     
Governor's Staff,
    Member of      
Governors, Board of 

High Commissioner    
Honorable, The          
Honorary Ambassador       
Honorary degrees
Honorary doctorate    
Honourable, The       

Indian Chief         
Inspector General    
Interim Official   
Introductions       
Invitations  
   Writing &  
   Addressing  
Invitations
    Military:
    Writing &
    Addressing

Judge, former     
Judge of US City
     County or State     
Judge, US Federal            
Junior, Senior,
    I, II, III, etc .       
Justice, Associate
     Federal
     Supreme Court
Justice, Associate
     State
     Supreme Court

King     
Knight      

Late, The
   (deceased persons)        
Lawyer      
Lesbian Couple    
Lieutenant      
Lieutenant Colonel,     
   USA, USAF, USMC          
Lieutenant General,
   USA, USAF, USMC      
Lieutenant Governor         

How to Address a Member of State Legislature:
Senator, Representative, Delegate,
Assemblyman, or Assemblywoman

MEMBER OF A STATE SENATE
      State senators use Senator as an honorific: addressed in writing and orally as Senator (name). State senators are addressed as State Senator (name) or Mr./Ms. (name) in Washington, DC, especially in the presence of United States Senators.

MEMBER OF OTHER STATE LEGISLATURES
      Most formally use Mr./Ms. (name) and identify as a member of (name of legislature).
      HOUSE OF DELEGATES: Delegates may less formally use Delegate as an honorific, most typically in conversation and for clarity: "Delegate Wilson will be here in ten minutes," or "Hello, this is Delegate Raymond Wilson's office, may I help you?"
      STATE ASSEMBLY: This pattern of use is also typical for members of an State Assembly and use of Assembly Member, Assemblyman and Assemblywoman as honorifics used for clarity.

Envelope, official:
    The Honorable
        (Full name)
            (Name of state legislature)
                (Address)

Letter salutation for other than a member of a senate:
    Dear Mr./Ms. (surname):

Letter salutation for a member of a senate:
    Dear Senator (surname):

    (See note above about addressing Senators)

How to Address a Former Elected State Official?
How do you address in writing a former state senator?
          -- R.W.

How do I address a letter to a former member of our state assembly?
          -- Roy O.

Dear R.W. and Roy O.,
          A state official elected in a general election is addressed as "the Honorable".  The rule is for former and retired officials: once one is "the Honorable" one is "the Honorable" for life.
          Retired/Former senators, since they are not one-officeholder-at-a-time officials, they continue to be addressed as Senator (Surname).
          Former members of other assemblies are formally addressed in a salutation or conversation as Mr./Ms./etc. (Surname) while in office, but as a practice many use Delegate/Representative/Delegate (Surname) in a salutation or conversation. It's not formal and traditional, but it's a common practice and useful when one wants to make sure everyone knows who the member is an current elected official and not just another Mr./Ms./etc.
        If you are addressing a letter relating to his/her public service, or it is social correspondence (a letter to a neighbor, a holiday note, or get-well card) -- address the envelope and use in the letter's address block:
                  The Honorable (Full Name)
                  (Address)
          If you are writing to someone who served as a state senator, but is now working in some commercial/professional role --  e.g., they are now your insurance agent, attorney, or stock broker -- and you are writing to them in the context of this commercial/professional endeavor -- address him/her as:
                  Mr./Ms./Dr./etc. (Full Name)
                  (Address)
.         In the salutation or in conversation use:
                  Mr./Ms./Dr./etc. (Surname)
         In the US we address people as pertinent to the situation. Each of us has many names and each is correct in a specific time and place. E.g., a woman named "Ann Robinson" might be addressed as "Mrs. Robinson", "Ann", "Sweetheart" or "Mom".  Each name is an appropriate form of address in a certain situation. How one is addressed relates to (1) who is addressing the person? and (2) in which role is the person being addressed?
        In the US our tradition is that we address people as pertinent to the situation.
         -- Robert Hickey

All about The Honorable
Link to Q&A just on officials in the U.S. addressed as The Honorable