The following streets are not included in Portland's street systems:

U.S. Presidents (12 of 43):

• John Adams (#3) and JQ (#6) were not in any original grids.  Adams St off of NW Miller has been annexed.
  
• Millard Fillmore (#13)
• Rutherford B. Hayes (#19)
• William McKinley (#25) was not honored in any original grid.  SE McKinley Rd. has been annexed.
• Calvin Coolidge (#30)
• Herbert Hoover (#31) despite living in Newberg during his childhood.
• Harry Truman (#33)
• Dwight Eisenhower (#34) 
• John F Kennedy (#35) was not honored in any original grid.  Kennedy Ct. off of NW Miller has been annexed. 
• Richard Nixon (#37)
• Ronald Reagan (#40)

Governors of Oregon:

• Most are not represented on street names

Mayors of Portland:

• Most are not represented on street names 

States of the Union (21 of 50 with 7 partials):

• Alabama
• Arizona
• Arkansas
• Colorado
• Connecticut
• Georgia
• Hawaii (this street used to exist off of N. Alaska)
• Indiana
• Kansas
• Kentucky
• Louisiana
• Maine (for obvious reasons)
• New Hampshire (though Hampshire is)
  
• New Jersey (though Jersey is)
  
• New Mexico
• North Carolina (though Carolina is)
• North Dakota (though Dakota is)
• Ohio
• Oklahoma
• Pennsylvania
• Rhode Island
• South Carolina (though Carolina is)
• South Dakota (though Dakota is)
• Tennessee
• Utah
• West Virginia (though Virginia is)
• Wisconsin
• Wyoming

Oregon Counties (13 of 39):

• Champoeg (historic) 
• Coos
• Crook
• Deschutes
• Douglas
• Gilliam was not honored in any original grid.  Gilliam Ln off of NW Miller has been annexed.
• Josephine
• Klamath
• Malheur
• Morrow
• Tuality (historic) 
• Umpqua (historic) 
• Wallowa