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The interstate highway route marker may or may not have the state name displayed. For the business route marker, go to the Business Highways page.
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INTERSTATE HIGHWAY NO. 10
Approved BPR, 10-1-59; Adm Cir 180-59
From the Texas-New Mexico State Line northwest of El Paso via El Paso and a junction with Interstate Route IH 20 southwest of Pecos to a junction with Interstate Route IH 35 in San Antonio and from another junction with Interstate Route IH 35 in San Antonio via Houston to the Texas-Louisiana State Line at or near Orange. (El Paso, Hudspeth, Culberson, Jeff Davis, Reeves, Pecos, Crockett, Sutton, Kimble, Kerr, Gillespie, Kendall, Bexar, Guadalupe, Caldwell, Gonzales, Fayette, Colorado, Austin, Waller, Fort Bend, Harris, Chambers, Jefferson, and Orange Counties)
[Ports To Plains Highway, with US 84, US 183, US 190 and SH 36 (H.C.R.# 157, 5/7/85)]
INTERSTATE HIGHWAY NO. 20
Minute Order 65684, 12-2-71; Adm Cir 125-71
From junction with IH 10 southwest of Pecos via Pecos, Fort Worth and Dallas to the Texas-Louisiana State Line east of Marshall. (Reeves, Ward, Crane, Ector, Midland, Martin, Howard, Mitchell, Nolan, Taylor, Callahan, Eastland, Erath, Palo Pinto, Parker, Tarrant, Dallas, Kaufman, Van Zandt, Smith, Gregg and Harrison Counties)
INTERSTATE HIGHWAY NO. 27
DOT Ltr, 12-19-75; Adm Cir 5-76
From a junction with IH 40 BU 287-B in Amarillo southerly to a connection with Loop 289 FM 1585 south of Lubbock. (Potter, Randall, Swisher, Hale, and Lubbock Counties)
INTERSTATE HIGHWAY NO. 30
Minute Order 65684, 12-2-71; Adm Cir 125-71
From a junction with IH 20 near the Parker-Tarrant County Line via Fort Worth and Dallas to the Texas-Arkansas State Line near Texarkana. (Parker, Tarrant, Dallas, Rockwall, Hunt, Hopkins, Franklin, Titus, Morris, and Bowie Counties)
INTERSTATE HIGHWAY NO. 35
Approved BPR 10-1-59; Adm Cir 180-59
From the International Boundary at Laredo via San Antonio and Austin to the junction of Interstate Routes IH 35 W and IH 35 E at or near Hillsboro and from the junction of Interstate Routes IH 35 W and IH 35 E at or near Denton to the Texas-Oklahoma State Line north of Gainesville. (Webb, LaSalle, Frio, Medina, Atascosa, Bexar, Guadalupe, Comal, Hays, Travis, Williamson, Bell, Falls, McLennan, Hill, Denton, and Cooke Counties)
INTERSTATE HIGHWAY NO. 35E
Approved BPR, 10-1-59; Adm Cir 180-59
From the junction of Interstate Routes IH 35 and IH 35 W at or near Hillsboro via Dallas to the junction of Interstate Routes IH 35 and IH 35 W at or near Denton. (Hill, Ellis, Dallas, and Denton Counties)
INTERSTATE HIGHWAY NO. 35W
Approved BPR, 10-1-59; Adm Cir 180-59
From the junction of Interstate Routes IH 35 and IH 35 E at or near Hillsboro via Fort Worth to the junction of Interstate Routes IH 35 and IH 35 E at or near Denton. (Hill, Johnson, Tarrant, and Denton Counties)
INTERSTATE HIGHWAY NO. 37
Approved BPR, 10-1-59; Adm Cir 180-59
From US 181/SH 35 & SS 544 in Corpus Christi to a junction with Interstate Route IH 35 in San Antonio. (Nueces, San Patricio, Live Oak, Atascosa, and Bexar Counties)
INTERSTATE HIGHWAY NO. 40
Approved BPR 10-1-59; Adm Cir 180-59
From the Texas-New Mexico State Line near Glenrio via Amarillo to the Texas-Oklahoma State Line east of Shamrock. (Deaf Smith, Oldham, Potter, Carson, Gray, Donley, Gray, and Wheeler Counties)
INTERSTATE HIGHWAY NO. 44
Approved AASHTO, 6-29-82; Adm Ltr 8-82
From 8th Street, 0.3 miles south of US 277 & SS 479, in Wichita Falls northerly concurrent with US 277 and US 281 to the Texas-Oklahoma State Line northeast of Burkburnett. (Wichita County)
INTERSTATE HIGHWAY NO. 45
Minute Order 65684, 12-2-71; Adm Cir 125-71
From SH 87 & SS 342 in Galveston via Houston to junction with IH 30 in Dallas. (Galveston, Harris, Montgomery, Walker, Madison, Leon, Freestone, Navarro, Ellis, and Dallas Counties)
INTERSTATE HIGHWAY SPUR NO. 110
Approved BPR, 3-28-67; Adm Cir 29-66
In El Paso, from a junction with Interstate Route IH 10 southerly to the Cordova Port of Entry. (El Paso County)
INTERSTATE HIGHWAY SPUR NO. 345
Minute Order 65684, 12-2-71; Adm Cir 125-71, 12-15-71
In Dallas from the junction of IH 30 & IH 45 north to a connection with US 75 & Spur SS 366. (Dallas County)
INTERSTATE HIGHWAY LOOP NO. 410
Minute Order 62561, 7-31-69; DOT Ltr, 7-7-69; Adm Cir 62-69
From IH 35 at Fratt westerly, southerly, easterly and northerly to another point on IH 35 near Fort Sam Houston. (Bexar County)
INTERSTATE HIGHWAY LOOP NO. 610
Approved BPR, 9-6-62; Adm Cir 133-62
From a junction with Interstate Route IH 10 in the eastern part of Houston circumferentially around the city to the point of beginning. (Harris County)
INTERSTATE HIGHWAY LOOP NO. 635
Minute Order 69106, 7-31-74; Adm Cir 77-74
From IH 20 southeast of Dallas, north and west to SH 121. (Dallas and Tarrant Counties)
INTERSTATE HIGHWAY LOOP NO. 820
Minute Order 65684, 12-2-71; Adm Cir 125-71
From IH 20 southwest of Fort Worth north, east and south to IH 20 southeast of Fort Worth. (Tarrant County)