Arizona
Arkansas
California
(sort
of) 
Colorado
Connecticut
District of Columbia
Georgia
Florida
Illinois
Indiana
(<1
mi)
Iowa
(<1
mi) 
Kansas
(historic
route)
Kentucky
(<1
mi)
Maryland
(+
spur) 
Michigan
Minnesota
Missouri
(<1
mi) 
(<1
mi)
Nebraska
Nevada
New Hampshire
New Jersey
New Mexico
New York
North Dakota
(secret)
Ohio
Oklahoma
(secret)
Oregon
Pennsylvania
Rhode Island
South Carolina
South Dakota
Tennessee
Texas
(secret)
Virginia
West Virginia
Wisconsin
Wyoming
Completely clinched 2-digit interstates and all US routes
(4 miles short on I-27)
Arkansas
California
(sort
of)
Colorado
Connecticut
District of Columbia
Georgia
Florida
Illinois
Indiana
(<1
mi)Iowa
(<1
mi)
Kansas
(historic
route) Kentucky
(<1
mi)Maryland
(+
spur) Michigan
Minnesota
Missouri
(<1
mi) (<1
mi) Nebraska
Nevada
New Hampshire
New Jersey
New Mexico
New York
North Dakota
(secret)
Ohio
Oklahoma
(secret)
Oregon
Pennsylvania
Rhode Island
South Carolina
South Dakota
Tennessee
Texas
(secret)
Virginia
West Virginia
Wisconsin
Wyoming
Completely clinched 2-digit interstates and all US routes
(4 miles short on I-27)
| Iowa
highways <15 miles |
                                 |
| Iowa highways 15-30 miles |
         |
| Iowa highways 30-60 miles |
 |
| Iowa highways 60-90 miles |
  |
| Iowa highways >90 miles |
   |