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Highway Multiplexes:
The Most, The Longest, The Most Routes, The Most Duplicates and more

 

Current Multiplex Counts by State (Interstates, US Routes, and State Routes only)

State Multiplexes Duplexes Triplexes Quadruplexes 5+ -plexes
Alaska 1 1
Connecticut 114 106 7 1
Delaware 65 59 6
District of Columbia 5 5
Florida          
Hawaii
Indiana          
Maryland 57 50 6 1
Massachusetts 175 158 17
Michigan          
New Jersey          
New York 227 185 38 4
Ohio          
Pennsylvania 428 394 31 3 1 (5)
Rhode Island 46 41 3 2
Virginia (list) 286 239 41 6
Washington 40 35 5
Québec 104 97 7

 

Longest Duplexes by State/Province/Country

State/Province/
Country
Longest Duplex Length
(miles)
Location
United States      
Canada      
Alaska AK 1/AK 4 14 Gakona Junction
Connecticut      
Delaware 9 404 12.42 Georgetown
District of Columbia
ALTERNATE
1
50
2 Washington
Florida      
Indiana      
Maryland 68 40 67.3 Keysers Ridge to Hancock
Massachusetts      
Michigan      
New Jersey      
New York 20 5 79 Avon to Auburn
Ohio      
Pennsylvania 70 76 *87.22 New Stanton to Breezewood
Rhode Island      
Virginia      
Washington      
Québec      
*When I-99 is extended northward past I-80 to I-180/US 15 (in 201x?), I-99/US 220 will be the longest PA multiplex at about 135 miles long.

 

Longest Triplexes by State/Province/Country

State/Province/
Country
Longest Triplex Length
(miles)
Location
United States      
Canada      
Alaska
Connecticut      
Delaware 301 71 896 3.40 Summit Bridge
District of Columbia
Florida      
Indiana      
Maryland 595 50 301 11.9 W of Annapolis
Massachusetts      
Michigan      
New Jersey      
New York      
Ohio      
Pennsylvania      
Rhode Island      
Virginia      
Washington      
Québec      

 

Longest Quadruplexes by State/Province/Country

State/Province/
Country
Longest Quadruplex Length
(miles)
Location
United States      
Canada      
Alaska
Connecticut      
Delaware
District of Columbia
Florida      
Indiana      
Maryland 595 50 301 2 1.4 Annapolis
Massachusetts      
Michigan      
New Jersey      
New York      
Ohio      
Pennsylvania
279
TRUCK
19
22
30
1 Pittsburgh
Rhode Island      
Virginia 77 81 11 52 5.75 E of Wytheville
Washington      
Québec      

 

Current Duplicated Multiplexes by State/Province/Country

Duplicated Multiplexes Count Locations
North to South or West to East
Interstate/Interstate
90 94 2 Tomah, WI to Madison, WI
Chicago, IL
Interstate/US Route
10 90 6 San Antonio, TX
Alleyton, TX
Brookshire, TX
Houston, TX
Beaumont, TX
Lake Charles, TX
15 89 4 Lehi, UT
North Salt Lake, UT
Centerville, UT
Great Falls, MT
20 80 4 Jonesville, TX
Mound, LA to Vicksburg, MS
Edwards, MS to Clinton, MS
Meridian, MS
25 20 26 87 2 Casper, WY
Douglas, WY
25 26 87 2 Casper, WY
Douglas, WY to Dwyer, WY
25 85 87 3 Cheyenne, WY
Denver, CO
Castle Rock, CO to Co/NM border
25 87 2 Buffalo, WY to Casper, WY
Douglas, WY to Raton, NM
27 87 2 Lubbock, TX
Tulia, TX
29 59 2 St. Joseph, MO
Fillmore, MO
29 81 2 Fargo, ND
Pembina, ND
35 69 2 Kansas City, KS
Liberty, MO
35 77 4 Waco, TX
Gainesville, TX
Moore, OK
Edmond, OK
37 281 2 Whitsett, TX
San Antonio, TX
39 51 3 Wausau, WI to Stevens Point, WI
Plover, WI to Portage, WI
South Beloit, IL to Normal, IL
44 277 281 2 Burkburnett, TX
Lawton, OK
55 51 2 Akers, LA
Jackson, MS
55 61 2 Hayti, MO
Scott City, MO
59 11 3 McCalla, AL
Meridian, MS
Nicholson, MS to Alton, LA
64 60 3 Callaghan, VA
Clifton Forge, VA
Hampton, VA
65 31 3 Warrior, AL
Thach, AL
70 6 7 Great River, UT to Mack, CO
Palisade, CO to Parachute, CO
Parachute, CO to Rifle, CO
New Castle, CO to Gypsum, CO
Vail, CO to Dillon, CO
W of Georgetown, CO to Idaho Springs, CO
Denver, CO
70 24 3 Limon, CO to Siebert, CO
Burlington, CO to Levant, NE
Kansas City, KS to Kansas City, MO
70 40 12 Lawson to Golden, CO
Aurora to Limon, CO
Campus to Topeka, KS
Kansas City, KS & MO
Blue Springs, MO to Wentzville, MO
East Saint Louis, IL
Pocahontas, IL
E of Marshall, IL
Fairview, OH
Wheeling, WV
Hancock, MD
Mount Airy, MD
77 21 3 Elkin, NC to Jonesville, NC
Mooresville, NC to Lake Norman, NC
Charlotte, NC to S of NC/SC line
77 52 2 N of Rocky Gap, VA
E of Wythewville, VA
78 22 2 Fredericksburg, PA to Allentown, PA
Bloomsbury, NJ to Lebanon, NJ
80 6 4 Lorah, IA to Dexter, IA
Altoona, IA to Lambs Grove, IA
Durant, IA to Davenport, IA
Gary, IN
80 30 3 Green River, WY to Walcott, WY
Laramie, WY to Cheyenne, WY
E of Cheyenne, WY to Pine Bluffs, WY
81 11 2 E of Wytheville, VA
S of Natural Bridge, VA
84 6 3 Danbury, CT
Newtown, CT to Southbury, CT
Farmington, CT to Manchester, CT
84 30 11 Portland, OR
Bonneville, OR to Cascade Rocks, OR
Cascade Rocks, OR to Hood River, OR
Hood River, OR to Mosier, OR
The Dalles, OR to Pendleton, OR
Pendleton, OR to La Grande, OR
La Grande, OR to North Powder, OR
Baker City, OR to Lime, OR
S of Huntington, OR to Palisades Corner, ID
Fruitland, ID to Bliss, ID
Burley, ID to E of Rupert, ID
85 29 4 Greensboro, NC to High Point, NC
Lexington, NC to Spencer, NC
Kings Mountain, NC to Grover, NC
Greenville, SC to Anderson, SC
90 12 2 Missoula, MT to Garrison, MT
Forsyth, MT to Miles City, MT
90 14 4 Sheridan, WY
Gillette, WY to Moorcroft, WY
Sundance, WY to Wall, SD
Dresbach, MN
90 87 2 Buffalo, WY
Wyola, MT
94 12 3 Miles CIty, MT
St. Paul, MN
Ann Arbor, MI
94 41 2 Milwaukee, WI to N of Wadsworth, IL
Northbrook, IL
95 1 5 Norwood, MA
Pawtucket, RI
New London, CT
Old Lyme, CT
New York City, NY to Fort Lee, NJ
95 17 2 Fredericksburg, VA
Coosawatchie, SC
95 301 2 Lumberton, NC
Santee, SC
540 71 2 Fort Smith, AR
Fayetteville, AR
Interstate/State Route
190 324 2

Niagara Falls, NY
Buffalo, NY

US Route/US Route
1 15 501 2 Sanford, NC
Southern Pines, NC
1 378 2 Lexington, SC
Columbia, SC
1 401 2 Raleigh, NC
Wise, NC
6 20 3 Freemont, OH
Cleveland, OH
Euclid, OH
6 34 2 Holdrege, NE
Princeton, IL
6 44 2 Hartford, CT
Providence, RI
6 50 2 Delta, UT
Grand Junction, CO
6 202 2 Peekskill, NY
Brewster, NY to Danbury, CT
6 322 2 Cleveland, OH
Meadville, PA
7 202 2 Danbury, CT
Brookfield, CT
12 20 2 Chicago, IL
Gary, IN
14 16 2 Yellowstone Nat'l Park, WY to Cody, WY
Uctoss, WY to Moorcroft, WY
19 74 2

Ranger, NC to Lauada, NC
Dellwood, NC

19 460 2

Tazewell, VA
Princeton, WV

20 26 3 Vale, OR to Mountain Home, ID
Butte City, ID to Atomic City, ID
Shoshoni, WY to Orin, WY
29 78 2 Atlanta, GA
Athens, GA
50 56 2 Fort Dodge, KS to Kingsley, KS
Gardner, KS to Overland Park, KS
59 69 2 Lufkin, TX
Narcissa, OK
59 71 2 Savannah, MO
Acorn, AR to Texarkana, AR
60 62 3 Cairo, IL to Wickliffe, KY
Paducah, KY
Versailles, KY
60 421 2 Frankfort, KY
Lexington, KY
61 67 2 Davenport, IA
Kirkwood, MO to Crystal City, MO
62 82 2 Brownfield, TX
Lorenzo, TX
64 264 2 Raleigh, NC to Wendell, NC
Manteo, NC to Nags Head, NC
64 412 2 Enid, OK
Tulsa, OK
74 76 2 Whiteville, NC to Wilmington, NC
Wrightsville, NC
90 98 2 Mobile, AL
Spanish Fort, AL
278 371 2 Rosston, AR
Nashville, AR
US Route/State Route
4 32 2 Schuylerville, NY
Mechanicville, NY
9 9A 2 Croton-on-Hudson, NY
Yonkers, NY
9 9N 2 Elizabethtown, NY
Lake George, NY
US 9W 32 3 Saugerties, NY
Kingston, NY
Newburgh, NY
11 26 2 Whitney Point, NY
Evans Mills, NY
20 5 2 Irving to Silver Creek, NY
Avon to Auburn, NY
41 MI 26 2 Phoenix, MI
Houghton, MI
59 10 2 Miami, OK
Grove, OK to Kansas, OK
69 KS 7 2 Fort Scott, KS
Columbus, KS
101 CA 1 3 San Francisco, CA
San Luis Obispo, CA
Las Cruces to Ventura, CA
222 272 2 Lancaster, PA
Wakefield, PA
State Route/State Route
9 10 2 Maysville, KY
Charters, KY
28 30 2 Blue Mountain, NY to Indiana Lake, NY
Margaretville, NY
WI 32/WI 57 2 De Pere, WI
Mequon, WI

 

Sources: Adam Froehlig, Douglas Kerr, Dan Moraseski, various maps and atlases, the newsgroup misc.transport.road, and the multiplex sites linked in the first table.

 


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