Arizona
Arkansas
California
(sort
of) 
Connecticut
Georgia
Illinois
Indiana
(<1
mi)
Iowa
(<1
mi) 
Kansas
(historic
route)
Kentucky
(<1
mi)
Maryland
(+
spur)
Michigan
Minnesota
Missouri
(<1
mi) 
(<1
mi)
Nebraska
New Hampshire
New Jersey
New Mexico
New York
North Dakota
(secret)
Ohio
Oklahoma
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)
Unclinched: 1, 2, 3, 9, 10, 12, 16, 25, 31, 32, 38, 39, 48, 81, 110, 136, 140, 141, 143, 183
Arkansas
California
(sort
of)
Connecticut
Georgia
Illinois
Indiana
(<1
mi)Iowa
(<1
mi)
Kansas
(historic
route)Kentucky
(<1
mi)Maryland
(+
spur)Michigan
Minnesota
Missouri
(<1
mi) (<1
mi) Nebraska
New Hampshire
New Jersey
New Mexico
New York
North Dakota
(secret)
Ohio
Oklahoma
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 |
    |
Unclinched: 1, 2, 3, 9, 10, 12, 16, 25, 31, 32, 38, 39, 48, 81, 110, 136, 140, 141, 143, 183
|
77.6% (2240/2886) |
Embarcadero to BR 80 (Sacramento); N jct. I-15 to east end. Interestingly, the distance from the west Iowa border to I-15 and the east Iowa border to I-95 are nearly identical, putting my "halfway point" of one-piece traveled I-80 by Newton. |
|
76.5%
(1112/1454) 73.6% (1263/1717) |
S end of
Minnesota split to N end of Texas split; S end of Texas split to TX 71 SPLITS: All I-35W in MN and TX; 24 mi. I-35E MN 1454=mileage excluding both splits; 1717=mileage including both splits |
|
57.8% (1761/3048) |
US 16 (Buffalo) to US 14 (Moorcroft); US 14 to W jct. SD 240; E jct. SD 240 to SD 63; US 83 to 3 miles east of north I-94 split; Wisconsin Dells to US 9 except between exits 145 and 178 in Ohio |
|
54.0% (1161/2151) |
Eisenhower
Tunnel/Dillon to I-25;
Limon CO to Colby KS; I-135 to IL 203; I-55/270 to IL 4; Old US 31 in
Indianapolis to US 15/I-270 minus five miles in downtown Columbus |
|
42.4% (404/952) |
North end to
I-90/94; I-74 duplex;
I-155 to BR 55 (Springfield); BR 55 to I-270; E jct. IL 3 to MS 302 |
|
40.3% (149/370) |
I-35E to I-45; US 59 to east end |
 |
37.2% (514/1382) |
WA 432 to US 199; US 97 to downtown Sacramento |
|
28.7% (511/1783) |
US 24 to US 12; I-40 duplex; I-24 to I-285; I-85 to US 27 except between I-475 junctions |
|
28.5% (726/2546) |
AZ 64 to
I-17; I-27 to E jct. I-35; I-30 to 3rd St. Memphis; W jct. I-24 to TN 66 |
|
23.7% (456/1924) |
Kittery ME to I-80; I-40 to I-26 |