List of Interstate Highways

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Primary interstates are the major interstate highways of the United States and are assigned a one or two-digit route number. Even route numbers are assigned to east/west routes, with the lower numbered routes being further south (I-10) and higher numbered routes in the north (I-90). Similarly, odd route numbers are assigned to north/south routes, with the lower numbered routes being further west (I-5) and the higher numbered routes being further east (I-95).

Three-digit Interstates are spur or loop interstates that usually service large cities and suburbs. The last two digits of a three-digit interstate are always the number of the parent route, the primary interstate where it originated. If the first digit is odd, the interstate is typically a spur route while if the first digit is even, the interstate is typically a loop route. Three-digit interstates are covered in their parent route's article, and those that have their own articles are linked below. (In the table below, interstates designated with an asterisk are "secret" interstates -- that is, they are not signposted as interstates.)

• Notable exceptions to these numbering standards are Interstate 238 in California and Interstate 99 in Pennsylvania.

Contents 1 Primary Interstates 2 Hawaiian Interstates 3 Alaskan and Puerto Rican Interstates 4 External links

Primary Interstates

Image:I-4.svg Interstate 4	- Tampa, FL (I-275) to Daytona Beach, FL (I-95)
Image:I-5.svg Interstate 5	- San Ysidro, CA (Mexican border) to Blaine, WA (Canadian border) Associated routes: I-105 | I-205 | I-305* | I-405 | I-505 | I-605 | I-705 | I-805
Image:I-8.svg Interstate 8	- San Diego, CA to Casa Grande, AZ (I-10)
Image:I-10.svg Interstate 10	- Santa Monica, CA to Jacksonville, FL (I-95) Associated routes: I-110 | I-210 | I-310 | I-410 | I-510 | I-610 | I-710 | I-910
Image:I-12.svg Interstate 12	- Baton Rouge, LA (I-10) to Alton, LA (I-10)
Image:I-15.svg Interstate 15	- San Diego, CA (CA-15) to Sweetgrass, MT (Canadian border) Associated routes: I-115 | I-215 | I-315* | I-515
Image:I-16.svg Interstate 16	- Macon, GA (I-75) to Savannah, GA Associated route: I-516
Image:I-17.svg Interstate 17	- Phoenix, AZ (I-10) to Flagstaff, AZ (I-40)
Image:I-19.svg Interstate 19	- Nogales, AZ (Mexican border) to Tucson, AZ (I-10)
Image:I-20.svg Interstate 20	- Kent, TX (I-10) to Florence, SC (I-95) Associated routes: I-220 | I-520 | I-820
Image:I-22.svg Interstate 22	- Memphis, TN (I-55 & I-40) to Birmingham, AL (I-20, I-59 & I-65) Under construction - opening 2006
Image:I-24.svg Interstate 24	- Pulley's Mill, IL (I-57) to Chattanooga, TN (I-75) Associated route: I-124
Image:I-25.svg Interstate 25	- Las Cruces, NM (I-10) to Buffalo, WY (I-90) Associated route: I-225
Image:I-26.svg Interstate 26	- Colonial Heights, TN (I-81) to Charleston, SC (US-17) Associated routes: I-126 | I-526
Image:I-27.svg Interstate 27	- Lubbock, TX (US-87) to Amarillo, TX (I-40)
Image:I-29.svg Interstate 29	- Kansas City, MO (I-35 & I-70) to Pembina, ND (Canadian border) Associated routes: I-129 | I-229
Image:I-30.svg Interstate 30	- Fort Worth, TX (I-20) to Little Rock, AR (I-40) Associated routes: I-430 | I-530 | I-630
Image:I-35.svg Interstate 35	- Laredo, TX (US-83) to Duluth, MN (MN-61) Associated routes: I-35E | I-35W | I-135 | I-235 | I-335 | I-435 | I-535 | I-635
Image:I-37.svg Interstate 37	- Corpus Christi, TX (US-181) to San Antonio, TX (I-35)
Image:I-39.svg Interstate 39	- Normal, IL (I-55) to Wausau, WI
Image:I-40.svg Interstate 40	- Barstow, CA (I-15) to Wilmington, NC (NC-132) Associated routes: I-140 | I-240 | I-440 | I-540 | I-840
Image:I-43.svg Interstate 43	- Beloit, WI (I-39, I-90 and I-94) to Green Bay, WI (US-41)
Image:I-44.svg Interstate 44	- Wichita Falls, TX (US-287) to St. Louis, MO (I-55) Associated routes: I-244 | I-444*
Image:I-45.svg Interstate 45	- Galveston, TX (TX-124) to Dallas, TX (I-30) Associated route: I-345*
Image:I-49.svg Interstate 49	- Lafayette, LA (I-10) to Shreveport, LA (I-20)
Image:I-55.svg Interstate 55	- La Place, LA (I-10) to Chicago, IL (US-41) Associated routes: I-155 | I-255
Image:I-57.svg Interstate 57	- Miner, MO (I-55) to Chicago, IL (I-94)
Image:I-59.svg Interstate 59	- Alton, LA (I-10 & I-12) to Lookout Mountain, GA (I-24) Associated routes: I-359 | I-459 | I-759
Image:I-64.svg Interstate 64	- St. Louis, MO (I-270) to Chesapeake, VA (I-264 & I-664) Associated routes: I-164 | I-264 | I-464 | I-564 | I-664
Image:I-65.svg Interstate 65	- Mobile, AL (I-10) to Gary, IN (I-90) Associated routes: I-165 | I-465 | I-565 | I-865
Image:I-66.svg Interstate 66	- Middletown, VA (I-81) to Washington, D.C. (US-29)
Image:I-68.svg Interstate 68	- Morgantown, WV (I-79) to Hancock, MD (I-70)
Image:I-69.svg Interstate 69	- Indianapolis, IN (I-465) to Port Huron, MI (Canadian border) Associated route: I-469
Image:I-70.svg Interstate 70	- Cove Fort, UT (I-15) to Baltimore, MD (I-695) Associated routes: I-170 | I-270 | I-370 | I-470 | I-670
Image:I-71.svg Interstate 71	- Louisville, KY (I-64) to Cleveland, OH (I-90) Associated routes: I-271 | I-471
Image:I-72.svg Interstate 72	- Hannibal, MO (US-61) to Champaign, IL (I-57) Associated route: I-172
Image:I-73.svg Interstate 73	- Candor, NC (US-220) to Greensboro, NC (I-40 & I-85)
Image:I-74.svg Interstate 74	- Bettendorf, IA (I-80) to Cincinnati, OH (I-75) Associated route: I-474
Image:I-75.svg Interstate 75	- Ft. Lauderdale, FL (FL-826) to Sault Ste. Marie, MI (Canadian border) Associated routes: I-175 | I-275 | I-375 | I-475 | I-575 | I-675
Image:I-76.svg Interstate 76	- West - Denver, CO (I-70) to Big Springs, NE (I-80)
Image:I-76.svg Interstate 76	- East - Westfield Center, OH (I-71) to Camden, NJ (I-295) Associated routes: I-176 | I-276 | I-376 | I-476 | I-676
Image:I-77.svg Interstate 77	- Columbia, SC (I-26) to Cleveland, OH (I-90) Associated route: I-277
Image:I-78.svg Interstate 78	- Bordnersville, PA (I-81) to New York City, NY Associated routes: I-278 | I-478* | I-678 | I-878*
Image:I-79.svg Interstate 79	- Charleston, WV (I-77) to Erie, PA (PA-5) Associated routes: I-279 | I-579
Image:I-80.svg Interstate 80	- San Francisco, CA (U.S. Route 101) to Fort Lee, NJ (I-95) Associated routes: I-180 | I-280 | I-380 | I-480 | I-580 | I-680 | I-780 | I-880 | I-980
Image:I-81.svg Interstate 81	- Dandridge, TN (I-40) to Fisher's Landing, NY (Canadian border) Associated routes: I-181 | I-381 | I-481 | I-581
Image:I-82.svg Interstate 82	- Ellensburg, WA (I-90) to Hermiston, OR (I-84) Associated route: I-182
Image:I-83.svg Interstate 83	- Baltimore, MD to Harrisburg, PA (I-81) Associated route: I-283
Image:I-84.svg Interstate 84	- West - Portland, OR (I-5) to Echo, UT (I-80) Associated route: I-184
Image:I-84.svg Interstate 84	- East - Scranton, PA (I-81) to Sturbridge, MA (I-90) Associated routes: I-384 | I-684
Image:I-85.svg Interstate 85	- Montgomery, AL (I-65) to Petersburg, VA (I-95) Associated routes: I-185 | I-285 | I-385 | I-485 | I-585 | I-985
Image:I-86.svg Interstate 86	- West - Heyburn, ID (I-84) to Pocatello, ID (I-15)
Image:I-86.svg Interstate 86	- East - Erie, PA (I-90) to Elmira, NY (NY-17)
Image:I-87.svg Interstate 87	- New York, NY (I-278) to Champlain, NY (Canadian border) Associated routes: I-287 | I-587 | I-787
Image:I-88.svg Interstate 88	- West - Moline, IL (I-80) to Chicago, IL (I-290)
Image:I-88.svg Interstate 88	- East - Binghamton, NY (I-81) to Schenectady, NY (I-90)
Image:I-89.svg Interstate 89	- Concord, NH (I-93) to Highgate Springs, VT (Canadian border) Associated route: I-189
Image:I-90.svg Interstate 90	- Seattle, WA to Boston, MA Associated routes: I-190 | I-290 | I-390 | I-490 | I-590 | I-690 | I-790 | I-890 | I-990
Image:I-91.svg Interstate 91	- New Haven, CT (I-95) to Derby Line, VT (Canadian border) Associated routes: I-291 | I-391 | I-691
Image:I-93.svg Interstate 93	- Canton, MA (I-95) to St. Johnsbury, VT (I-91) Associated routes: I-293 | I-393
Image:I-94.svg Interstate 94	- Billings, MT (I-90) to Port Huron, MI (Canadian border) Associated routes: I-194 | I-294 | I-394 | I-494 | I-694 | I-794 | I-894
Image:I-95.svg Interstate 95	- Miami, FL (U.S. Route 1) to Houlton, ME (Canadian border) Associated routes: I-195 | I-295 | I-395 | I-495 | I-595 | I-695 | I-795 | I-895
Image:I-96.svg Interstate 96	- Muskegon, MI (US-31) to Detroit, MI (I-75) Associated routes: I-196 | I-296* | I-496 | I-696
Image:I-97.svg Interstate 97	- Annapolis, MD (US-50) to Baltimore, MD (I-695)
Image:I-99.svg Interstate 99	- Bedford, PA (I-76) to Bald Eagle, PA (US-220)
Image:I-238.svg Interstate 238	- Hayward, CA (I-580) to San Lorenzo, CA (I-880)

Hawaiian Interstates

The interstate highways in Hawaii are signed with the standard Interstate shield, with the letter "H-" prefixed before the number. They are fully controlled-access routes built to the same standards as the mainland Interstate routes.

• Image:I-H1.svg Interstate H-1

Associated route: I-H-201

• Image:I-H2.svg Interstate H-2
• Image:I-H3.svg Interstate H-3

Alaskan and Puerto Rican Interstates

The Federal Highway Administration funds four routes in Alaska and three routes in Puerto Rico under the same program as the rest of the Interstate Highway system. However, these routes are not required to meet the same standards as the mainland routes:

"Highways on the Interstate System in Alaska and Puerto Rico shall be designed in accordance with such geometric and construction standards as are adequate for current and probable future traffic demands and the needs of the locality of the highway." [1]

Alaska's "Interstates" are unsigned, though they all have state highway numbers (which don't match the Interstate numbers).[2]

• Image:I-A1.svg Interstate A-1
• Image:I-A2.svg Interstate A-2
• Image:I-A3.svg Interstate A-3
• Image:I-A4.svg Interstate A-4

Like Alaska, Puerto Rico signs its "Interstates" as territorial routes, and the numbers do not match their official Interstate designations. However, many of the territory's routes are freeway-standard toll roads.[3]

• Image:I-PR1.svg Interstate PRI-1
• Image:I-PR2.svg Interstate PRI-2
• Image:I-PR3.svg Interstate PRI-3

Template:Ed rightMain Interstate Highways (major in pink)														Image:I-blank.svg
4	5	8	10	12	15	16	17	19	20	22	24	25	26	27	29
30	35	37	39	40	43	44	45	49	55	57	59	64	65	66	68
69	70	71	72	73	74	75	76 (W)		76 (E)		77	78	79	80	81
82	83	84 (W)		84 (E)		85	86 (W)		86 (E)		87	88 (W)		88 (E)
89	90	91	93	94	95	96	97	99	(238)		H-1	H-2	H-3
Unsigned			A-1	A-2	A-3	A-4	PRI-1		PRI-2		PRI-3
Lists		Main - Auxiliary - Suffixed - Business - Proposed - Unsigned Gaps - Intrastate - Interstate standards

External links

• Alaska Roads - Interstate ends photos
• Puerto Rico road photos
• The Dwight D. Eisenhower National System of Interstate and Defense Highways Route Log and Finder List
• 3-digit Interstate Highways