List of intrastate Interstate Highways

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The intrastate Interstate Highways in the contiguous United States, highlighted in red, not including Interstates 73 and 99.

There are several intrastate Interstate Highways; that is, Interstate Highways that are located entirely within one state. The concept seems contradictory at first; it is important to note that the word "Interstate" refers to the way the entire group of highways is funded (as a national system of interconnected highways), not to the route each given highway travels.

[edit] Within the contiguous 48 states

Interstate Highway	Route	Length[1]
Interstate 4	Tampa, FL (I-275) to Daytona Beach, FL (I-95)	132.3 mi
Interstate 12	Baton Rouge, LA (I-10) to Slidell, LA (I-10/I-59)	85.6 mi
Interstate 16	Macon, GA (I-75) to Savannah, GA	166.8 mi
Interstate 17	Phoenix, AZ (I-10) to Flagstaff, AZ (I-40)	145.8 mi
Interstate 19	Nogales, AZ (Mexican border) to Tucson, AZ (I-10)	63.4 mi
Interstate 27	Lubbock, TX (US-87) to Amarillo, TX (I-40)	124.1 mi
Interstate 37	Corpus Christi, TX (US-181) to San Antonio, TX (I-35)	143.0 mi
Interstate 43	Beloit, WI (I-39 & I-90) to Green Bay, WI (US-41)	191.6 mi
Interstate 45	Galveston, TX (TX-124) to Dallas, TX (I-30)	284.9 mi
Interstate 49	Lafayette, LA (I-10) to Shreveport, LA (I-20)	208.3 mi
Interstate 73	Candor, NC (US-220) to Greensboro, NC (I-40 & I-85)	12.3 mi
Interstate 86 (west)	Heyburn, ID (I-84) to Pocatello, ID (I-15)	62.9 mi
Interstate 87	New York, NY (I-278) to Champlain, NY (Canadian border)	333.5 mi
Interstate 88 (west)	Barstow, IL (I-80) to Hillside, IL (I-290)	140.6 mi
Interstate 88 (east)	Binghamton, NY (I-81) to Schenectady, NY (I-90)	117.8 mi
Interstate 96	Muskegon, MI (US-31) to Detroit, MI (I-75)	192.1 mi
Interstate 97	Annapolis, MD (US-50) to Baltimore, MD (I-695)	17.6 mi
Interstate 99	Bedford, PA (I-70/I-76) to Bald Eagle, PA (US-220)	53.0 mi

[edit] Outside of the contiguous 48 states

As Alaska and Hawaii do not share land borders with any other U.S. state, their Interstate highways are all located fully within their respective state's boundaries. Puerto Rico is not a state; however, it also has highways funded by the Federal Government as Interstate highways.

[edit] Signed Interstates

H-1, H-2, and H-3 stand for Hawaii-1, Hawaii-2, and Hawaii-3, respectively. These freeways are part of the Interstate Highway System and are thus called Interstate highways.

Interstate Highway	Route	Length[1]
Interstate H-1	Kapolei, HI (HI-93) to Honolulu, HI (HI-72)	27.2 mi
Interstate H-2	Pearl City, HI (H-1) to Wahiawā, HI (HI-99)	8.3 mi
Interstate H-3	Hālawa, HI (H-1) to Marine Corps Base Hawaii	15.3 mi

[edit] Unsigned Interstates

Interstate highways in Alaska and Puerto Rico are not signed as Interstate highways, and are designated as such primarily for purposes of Federal funding. Interstates A-1 through A-4 are located in Alaska, and Interstates PRI-1 through PRI-3 are located in Puerto Rico. These highways are not required to meet interstate standards, and as a result, most portions of these interstate highways are not grade-separate freeways. Freeways in Puerto Rico are primarily toll roads that are not funded through the Eisenhower Interstate System. Very few freeways exist in Alaska; they are located primarlily near Anchorage, Fairbanks, and Wasilla.

Interstate Highway	Route	Length[1]
Interstate A-1	Anchorage, AK (A-3) to Canadian border	408.2 mi
Interstate A-2	Tok, AK (A-1) to Fairbanks, AK (A-4)	202.2 mi
Interstate A-3	Anchorage, AK (A-1) to Soldotna, AK	148.1 mi
Interstate A-4	Palmer, AK (A-1) to Fairbanks, AK (A-2)	323.7 mi
Interstate PRI-1	Ponce, PR (PRI-2) to San Juan, PR (PRI-2)	71.1 mi
Interstate PRI-2	Ponce, PR (PRI-1) to San Juan, PR (PRI-3)	138.1 mi
Interstate PRI-3	San Juan, PR (PRI-2) to Ceiba, PR	40.6 mi

[edit] Notes

Trivia sections are discouraged under Wikipedia guidelines. The article could be improved by integrating relevant items and removing inappropriate ones.

• This list only includes the primary Interstate highways (those with route numbers less than 100). Most (but not all) three digit Interstates are intrastate. Interstate H-201 is considered a three digit Interstate as well.

• Interstate 73 may eventually reach Michigan and South Carolina.

• Interstate 49 may eventually reach Kansas City, Missouri.

• Interstate 99 may eventually extend through New York but it currently has no direct connection with any other interstate. Surface roads connect it with I-70/I-76 at its south end.
• Interstates 19 and 87 reach the Mexican and Canadian borders, respectively, but do not cross any state lines.

[edit] References

1. ^ ^{a b c} FHWA Route Log and Finder List: Table 1. Federal Highway Administration (2002-10-31). Retrieved on 2007-08-16.

edit Main Interstate Highways (multiples of 5 in pink)
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		Primary			Main - Intrastate - Suffixed - Future - Gaps
		Auxiliary			Main - Future - Unsigned
		Other			Standards - Business - Bypassed