Yes, I realize that I-5 is not really a Two-Digiter, but pretend there's a leading zero.
Evens run east-west, starting in the south and generally increasing in number as you move north. Odds run north-south, starting on the west coast and generally increasing in number as you head east. (Updated 3/18/2006)
| Interstate | Approximate Mileage | Comments |
 | WA: 15-30 | I'm not sure how much of my visit to Seattle was on the interstate. |
 | Total: 117
AL: 22
MS: 42
AZ: 5
CA: 48 | From I-15 in Ontario, CA, to Santa Monica, CA. Also, five miles in Phoenix and Tempe, AZ. Then there's the stretch from the southern terminus of I-65 in Mobile to the Biloxi/Gulfport, Mississippi, area. |
 | Total: 354
UT: 15
AZ: 29.39*
NV: 123.77*
CA: 186 | South from Utah State Road 9 through Arizona to Las Vegas, NV, and then through the California desert to I-10 in Ontario, east of LA. |
ET | GA: 24 | From GA-119 to the end in Savannah, GA. |
A,NT,ST | AZ: 145.76* | I-17 connects I-40 in Flagstaff (elevation 6910 feet) with I-10 in Phoenix (elevation 1090 feet). Why it does not share a number with I-19, I don't know. |
ET | Total: 299
SC: 141.51*
GA: 157 | I've been from the eastern terminus on I-95 in Florence, SC, through Columbia, SC, and August, GA, to GA-6 a couple of miles west of Atlanta. |
A,ET,WT | Total: 316.36
IL: 38.73*
KY: 93.37*
TN: 180.16*
GA: 4.10* | All of it. The eastern terminus is I-75 in Chattanooga, TN, and the western terminus is I-57 in southern Illinois. |
 | CO: 1 | South from Exit 141 all the way down to Exit 140 in Colorado Springs, CO |
ET | Total: 131
NC: 15
SC: 116 | East from Columbia, SC, to I-95 and from the eastern terminus in Charleston, SC, to I-95. In North Carolina, I've been from Columbus to Herndersonville, where the exit numbers had recently been changed to account for starting the numbering at the Tennessee border and not at I-40 in Asheville. Also, I've been on about 10 miles of "Future I-26" north of Asheville, which I suppose is now present I-26 |
ET | Total: 2299
NC: 419.40*
TN 455.28*
AR: 284.69*
OK: 331.03*
TX: 177.10*
NM: 373.51*
AZ: 258 | All the way from its eastern terminus in Wilmington, NC to the Petrified Forest National Park in Arizona, and then from Holbrook, AZ to Kingman, AZ. At several places in Arizona, New Mexico, Texas, and Oklahoma I-40 coincides with the Historic Route 66. I've driven the Nashville-Chapel Hill, NC, trip way too often. In Wilmington there is a mileage sign saying "Barstow, CA 2547." |
NT | Total: 71
MO: 56
IL: 8
AR: 7 | A 3 mile segment in St. Louis, MO, and East St. Louis, IL, where it coincides with I-64 and I-70 while crossing a bridge over the Mississippi River, plus from I-57 northward to Cape Girardeau, MO, and from US-62 southward to I-155, and another 7 mile stretch in Eastern Arkansas from where it joins I-40 heading out of Memphis to US-64. Back in Illinois for the last 6 miles, where it is the Aldai E. Stevenson Expressway, from Cicero Ave to the northern terminus at Lake Shore Drive |
NT,ST | Total: 85
IL: 72
MO: 13 | In southern Illinois, 53 miles from the western terminus of I-24 where I-64 heads off toward St. Louis. In Chicagoland, the last 19 miles from Exit 339 in Richton Park to the northern terminus at I-94. In Missouri, from US-62 to the southern terminus at I-55 |
NT | Total: 31
GA: 20.67*
AL: 10 | From the northern terminus at I-24 in extreme northeastern Georgia to state road 40 in Alabama. |
ET | Total: 264
MO: 1
IL: 78
IN: 4
KY: 28
WV: 25
VA: 184 | From a couple of miles west of Lexington, VA, through where it coincides with I-81 then through Charlottesville, to Richmond where it coincides with I-95. Also, from where it joins I-57 south of Mt. Vernon, IL, across the Mississippi River into St. Louis, MO. Also, a ten mile strech from I-65 in Louisville, KY, across the Ohio River into Indiana to US-150. And 22 miles from I-75 north of Lexington, KY, west to US-127 south of Frankfort, Ky. Plus about 25 miles from US-60 near Crawley, WV, east to White Sulphur Springs, WV. And about ten miles near Covington, VA, and then the eastern terminus in Norfork to the other side of Norfork across the brigde into Hampton. |
ST | Total: 626
AL: 367.00*
TN: 121.71*
KY:137 | Mobile, AL, up through Alabama and Tennessee to Nashville and up through Kentucky to I-71 in Louisville, KY. Read more about Alabama's Welcome Center on I-65. |
 | VA: 4 | I've only been on the part where I-66 coincides with US-17 South in Fauquier County, Virginia. |
ET | MD: 40 | From where US-220 North joins it on the western edge of Cumberland, Maryland, to the eastern terminus at the junction of it, I-70, and US-522 at the narrowest part of Maryland around Hancock. |
 | IN: 57 | I've been from US-6 in northeastern Indiana down to I-469 north of Fort Wayne, and from I-469 south of Fort Wayne to Indiana state road 22. |
 | Total: 986
PA: 20
IL: 2
MO: 251.66*
KS: 424.15*
CO: 100
UT: 189 | From I-64 in East St. Louis, IL, through St. Louis (where 70 is the Mark McGwire Highway) all the way across Missouri, all the way across Kansas to where US-24 South splits off at Limon, CO. Then from US-50 in Grand Junction, CO, to US-89 in Sevier, UT. Also, 15 miles from Old Exit 8 to Old Exit 9 on the Pennsylvania Turnpike. Plus, 5 or so miles where it coincides with I-79 in southwest Pennsylvania. |
 | Total: 141
KY: 96
OH: 45 | From Louisville, KY, through Cincinnati, OH, to US-68 in Clinton County. |
A? | NC: 30? | I-73 will eventually go from Michigan to South Carolina, but to my knowledge as of January 19, 2004, the only place where I-73 currently exists is south of Asheboro, NC, where it coincides with I-74 and for the most part with US-220. From Asheboro northward, it is Future 73/74 for about 10 miles before Future 74 veers off to the northwest with US-311, while Future 73 continues along with US-220 to Greensboro. Where it goes after the intersection with I-85, I don't know. | |
 | Total: 95
IN: 39
OH: 9
NC: 47? | I went from Greensburg, IN, home of the aspen tree growing out of the county courthouse, eastward the western side of the Cincinnati metropolitan area. Also the new southern part from I-77 near Mt. Airy, NC, to US-52 where it becomes the "Future I-74 Corridor" to Winston-Salem. See also the note for I-73. |
 | Total: 727
MI: 12
OH: 142
KY: 75
TN: 76
GA: 355.11*
FL: 142 | From Cleveland, TN, through Chattanooga, through Atlanta and southern Georgia to somewhere in central Florida. Also about 50 miles in and around Knoxville, TN, from where US-25W joins I-75 near Caryville, through the place where it coincides with I-640 and then with I-40 plus 4 miles after they split. |
(Eastern)
ET | Total: 64
NJ: 3.04*
PA: 61 | We took the Pennsylvania Turnpike from I-376 (Old Exit 6) to Donegal (Old Exit 9) on our way to Frank Lloyd Wright's Fallingwater. The toll was $1.45 (2003 dollars). Then in the Philadelphia area, I took I-76 from it's eastern terminus on I-295 in the New Jersey suburbs, across the Walt Whitman Bridge (Toll $3.00 (2006 dollars)) into South Philadelphia and then followed the Schuykill River to Exit 27 at Valley Forge. |
 | Total: 173
SC: 75
NC: 35
VA: 69.4*
WV: 9 | From Charlotte, NC, to Columbia, SC, and then also from I-74 near Mt. Airy, NC, through western Virginia to Princeton, WV, where I-77 becomes a toll road. There is a ten mile stretch in western Virginia where 77 North and 81 South (and 77 South and 81 North, too) coincide. It's nice to go both North and South at the same time. Then there's 15 miles south of I-40 near Statesville, NC. |
WT | Total 105
PA: 75.23*
NJ: 30 | I drove from I-287 in New Jersey westward to Pennsylvania state road 61, the exit with the giant Cabela's store. If I had known it was "being touted as Pennsylvania's future #1 tourist attraction," I might have stopped, but I had to get to the forty-year-old coal mine fire under Centralia. Okay, maybe not because the second time I drove past it, we continued on to the western terminus at I-81. |
 | Total 236
WV: 64
PA: 172 | From US-33 in West Virginia northward to I-90 just south of Erie, PA. In West Virginia, I saw this poor pug on the back his owner's motorcycle trailer. It did not look happy. |
ET | Total: 55
PA: 51
NJ: 4 | In eastern Pennsylvania from I-81 to BUS. US-209 in East Stroudsburg, and then that little part in New Jersey where it coinicides with I-95 headed toward the George Washington Bridge. It doesn't actually make it across the bridge though. |
ST | Total: 687.3
TN: 75.66*
VA: 324.92*
WV: 26.00*
MD: 12.08*
PA: 232.63*
NY: 16 | From the southern terminus at I-40 in eastern Tennessee up to I-88 in Binghamton, NY. (See comments for I-77.) |
NT | Total: 72
PA: 50.8*
MD: 22 | From the norther terminus at I-81 in Harrisburg, PA, to I-695 in Baltimore, MD. |
(Eastern) | Total: 91
PA: 1
NY: 71.79*
CT: 18 | From US-209 in extreme eastern Pennsylvania across New York to Connecticut State Road 34 east of Danbury. |
NT,ST | Total: 583
VA: 67*
NC: 233*
SC: 105*
GA: 116
AL: 62 | I lack only a small part in the southern part of Atlanta and then from Opaleika, Alabama, to Newnan, Georgia. |
NT | NY: 60 | From the northern terminus at the Canadian boarder five miles to US-11 in upstate New York, and from New York State Road 9N in Lake George, NY, to New York State Road 50 in Saratoga Springs, NY. Also from I-95 in the Bronx up into Yonkers, and then the part where it coincides with I-287 going across the Tappen Zee Brigde. |
(Eastern)
A,ET,WT | NY: 117.75* | EASTERN PART ONLY--From the eastern terminus in Schenectady, NY, and the western terminus at I-81 in Binghamton, NY. |
 | VT: 10 | From US-2 to I-189 in Burlington, VT |
 | Total: 137
IL: 22
PA: 25
NY: 70 | On the Dan Ryan and John F. Kennedy Expressways, from where it joins I-94 to where I-190 splits off toward Chicago-O'Hare International Airport. Then following Lake Erie from I-79 south of Erie, PA, following Buffalo, NY, a route mostly flanked by vineyards. |
 | Total: 118
MA: 16
NH: 102 | From I-95 on the northern side of Boston, MA, to somewhere in the White Mountains in New Hampshire. Occasionally we took US-3 which parallels I-93, like to avoid the toll portion between Manchester, NH, and Concord, NH. |
ET | Total: IL: 19
MI: 87 | On the Dan Ryan and John F. Kennedy Expressways, from the northern terminus of I-57 to where I-90 splits off. I've been on part of the brief stretch in Illinois and Indiana where I-94 runs south of I-90, violating the general principle that the higher even numbers are to the north of the lower ones. In Michigan, I-94 starts right after the US customs booths in Port Huron. I took it from there down to I-696 in the suburb spawned by Detroit. Then I also took it from Ann Arbor into downtown Detroit. Due to all the construction, most of the on ramps getting back were closed. The city seems to be doing anything it can to keep people from fleeing Detroit. |
 | Total: 900
GA: 4
SC: 198.76*
NC: 124
VA: 143
DC: 0.11*
MD: 110.01*
DE: 23.43*
PA: 30
NJ: 80
NY: 18
CT: 70
RI: 42.36*
MA: 56 | There's the part from New Haven, CT, through Providence, RI, to I-93 on the northern side of Boston. In New Jersey, there is the part on the western side of Trenton, from the Pennsylvania border to the interchange with US-1 and I-295, where I-95 ends. I've also been on the New Jersey Turnpike from where it intersects I-195 east of Trenton and northward. (It continues southward and the takes the NJ Turnpike Extension to the Delaware River on I-276.) I have taken it through northern New Jersey across the George Washington Bridge into to I-87 in The Bronx, and then also from the I-695 interchange in the Bronx northward through Westchester County to I-287. In Pennsylvania, I have taken it from the New Jersey border southward to the exit for the Tacony-Palmyra Bridge. Plus, from Exit 1 in Pennsylvania, southward through Delaware, Maryland, Washington, DC, and norther Virginia, to where I-295 joins in Petersburg, VA. Oh and then there's the part from US-64 around Rocky Mount, NC, northward to US-58 in Emporia, VA, and the stretch from I-40 in eastern North Carolina through South Carolina across the Savannah River into Georgia to Georgia State Road 21. |
 | MI: 30? | With all the construction in Detroit, I'm unsure how much of it I've been on. |
If the first digit is odd, then it is technically a spur, linking a city not on the interstate to the interstate. An even first digit indicates a loop or bypass connecting one interstate with itself or another interstate.
| Interstate | Approximate Mileage | Comments |
(Biloxi, MS)
A | MS: 4.10* | This short little spur provides access to the eastern end of Biloxi from I-10 in D'Iberville. |
A | TN: 11.17* | This spur connects I-40/75 to US-129 in the greater Knoxville area, providing quick access from the west to McGhee Tyson Airport and Alcoa and Maryville. |
(Caruthersville, MO, and Dyersburg, TN) | Total: 14
MO: 11
TN: 3 | I-155 provides the only bridge across the Mississippi between Cairo, IL, and Memphis, TN. |
(Mobile, AL)
A | AL: 4.90 | It's easier to get to downtown Mobile thanks to I-165. |
A? | TN: 7? | I may have been on all of it, but I'm not sure. I've driven from I-81 north to the terminus in Kingsport although I'm not quite sure where the end is. I think it's at US-11W, but the road, which is also US-23 the whole way, continues as a multilane limited-access highway for two more miles. However, my main concern is on the other side of I-81 toward Johnson City. Although my map says this is I-181, too, the actual exit on I-81 pointed to I-26 South. |
(Greenville, SC) | SC: 2 | I've been on the northern part of the spur, which provides quick access from the west to the municiply-mandated "cool" downtown of Greenville. On the south side of I-85, however it is the new "Southern Connector," a financially insolvent toll road, which in theory provides quicker access to I-385 for people from the western Greenville suburbs who want to go to Columbia. |
A | VT: 1.49* | This spur connects I-89 and US-7 in Burlington, VT. |
(Chicago) | IL: 1 | This spur connects I-90 with Chicago-O'Hare Int'l Airport, but I haven't been all the way into the airport, only to US-12/US-45. |
(Buffalo)
A | NY: 28.34* | This spur takes one from I-90 from eastern Buffalo, through downtown along the Niagara River, across Grand Island, around the city of Niagara Falls, NY, ending in a bridge to Canadawith Chicago-O'Hare Int'l Airport, but I haven't been all the way into the airport, only to US-12/US-45. |
A | NJ: 34.17* | This spur connects I-295 on the east side of Trenton to I-95/New Jersey Turnpike and then extends out to the Garden State Turnpike on the Jersey Shore near Point Pleasant. |
(Las Vegas, NV) | NV: 9 | I-215 allows ready access to the southern end of Las Vegas Blvd, a.k.a. the Strip, and McCarran International Airport, a.k.a. LAS, when entering town from the southeast via US-93/95, which is also known as |
(Asheville, NC)NC: 9.14* | This loop goes more through downtown Asheville and will eventually connect to I-26 North of Asheville. | |
A | TN: 2* | A Dead Interstate--In Nashville circa 2000 the route of I-65 through the city changed to eliminate this number for the stretch that connected I-65 with I-40 on the northwest side of town. |
(Washington, DC) | MD: 10 | I've taken this from the Beltline in Bethesda, MD, out to Rockville, MD. |
(Knoxville)
A | TN: 2* | I-275 picks up the direct northern approach to downtown Knoxville when I-75 veers off to the west with I-640. |
(Cincinnati) | Total: 39
OH: 27
KY: 12 | I-275 rings Cincinnati, including a portion in Kentucky. I've been on the eastern side from I-71 southward to I-71/75 and then on the western side from I-74 northward to US-27. |
(Charlotte) | NC: 5 | This loops tightly around downtown Charlotte. |
| PA: 10 | Since I-79 lies to the west of Pittsburgh, I-279 loops off to connect it with downtown. I was really surprized to find a run-away truck ramp just before the Ft. Pitt Tunnel, which leads directly to the Ft. Pitt Bridge. Our hotel was on I-279 and required us fighting the morning bumber-to-bumber traffic. I have never been so glad that I walk to school every morning. |
 | GA: 10 | I guess I've been on about about the WSW eighth of this loop around Atlanta. |
(Chicago)
A | IL: 29.84* | This loop connects I-90/I-94 in downtown Chicago to I-90 on the northwest side of town. |
 | IL: 18 | In Chicago, this loop connects I-94 on the south side to I-94 on the north side, but I've only been on the part from I-294 to Cicero Ave. |
(New Jersey)
A | Total: 73.77*
DE 5.71*
NJ: 68.06* | From the Delaware Memorial Bridge, I-295 goes from Wilmington, DE, between the New Jersey Turnpike and the Delaware River to the norther side of Trenton. |
(Richmond) | VA: 37 | I've been on this loop from US-330 down the eastern side of the Richmond-Petersburg metropolitan area. |
A | MI: 1.06* | I'm not sure what the point of this tiny spur in downtown Detroit is. |
A | PA: 14.70* | In downtown Pittsburgh, this spur goes along the northern shore of the Monongehala, heading east allowing quicker access to the Pennsylvania Turnpike. |
A | VA: 1.67* | This spur is really more of a glorified exit ramp having no actual exits and ending at a stoplight. It allows direct access from I-81 with downtown Bristol, Virginia, and then across State Street to Bristol, Tennessee. |
 | SC: 7 | This spur connects downtown and the eastern side of Greenville, SC, with I-26 heading toward Columbia. I've only been from the northern terminus to I-85 though. |
(Washington, DC) | Total: 10
VA: 8
DC: 2 | This spur goes from the I-495 Beltway in Virginia through Alexarandia and Arlington into Washington, DC. |
(Los Angeles) | CA: 35 | We got on the 405 from I-10 near Santa Monica, but I'm not sure where in Orange County we got off heading toward Edison International Field of Anaheim, home of the Anaheim Angels. |
(Nashville)
A | TN: 7.64* | The Nashville 440 starts at I-40 west of downtown and then loops south, where it crosses I-65 before ending in I-24 and I-40 (The interchange is difficult to explain exactly). |
(Raleigh) | NC: 10 | The Raleigh 440, the Inner and Outer Beltlines, encircles downtown Raleigh, but in order for it to be a full loop, I-40 and I-440 overlap for 7 miles on the south side of town. It would be so much simpler if they didn't overlap so that I-440 would not be a loop and could therefore be labled with "East" and "West" and not "Inner" and "Outer." |
A | IN: 30.83* | I-469 loops around the eastern side of Fort Wayne, IN. I took it because the electronic message board told me to take it to avoid the construction delay. Did I save time? I can't say for sure, but it seems unlikely. |
(Washington, DC) | Total: 56
VA: 15.28*
DC: 0.11*
MD: 41* | The Capitol Beltway circumscribes Washington, DC, and several Virginia and Maryland suburbs. |
(Long Island, NY) | NY: 30 | The Long Island Expressway brings the northern half of Long Island in to Manhattan. I've been on it from NY-454 towards the Islip airport to the Cross Island Parkway in Queens towards the Throg's Neck Bridge. |
(Las Vegas) | NV: 5 | As US-93 and US-95 approach Las Vegas from the southwest, I-515 escorts them up the eastern side of Las Vegas to I-15 on the northern side of town. |
(Raleigh) | NC: 9 | I've been on the first part of this spur which splits off I-40 between RTP and RDU and heads off towards north Raleigh. It currently goes to US-1 but is being extended further. Someone told that eventually it will circle all the way around Raleigh, which makes me think it could become the "Outer Outer Beltline" and the "Inner Outer Beltline." |
A | AL: 21 | This spur connects Huntsville, AL, with I-65 across the Tennessee River from Decatur, AL. |
A | PA: 3* | This little spur takes Veterans Bridge across the Allegheny in order to connect I-279 with the eastern side of downtown Pittsburgh. |
A? | SC: 3 | This spur connects BL-85 to downtown Spartanburg, SC. The signs on the side of North Pine Street say that it is actually I-585 (and not "TO I-585") despite being a regular multilane highway with stoplights, which seem contractory to the whole interstate thing. I believe I ate lunch at a Taco Bell that technically has an unnumbered "exit" on I-585. |
A | TN: 11* | In Knoxville, TN, this loop goes around the northern side of town. For about 4 miles, I-640 coincides with I-75. |
(Baltimore) | MD: 18 | On this loop around Baltimore, I've been on the part that connects I-83 and I-95 on the western side of the city. |
A | MI: 28* | I-696 connects I-94 and I-96 through many northern Detroit suburbs. |
