Historically, other interstates were given directional suffixes. On every other interstate, the directional suffixes were phased out by giving the route a loop or spur designation. In the case of I-35, since both branches return to a unified interstate beyond the cities of Dallas and Fort Worth, the AASHTO committees allowed the suffixes to remain.
During the 1970s, billboards existed on I-35 encouraging travelers to take the faster and shorter I-35W route.
Interstate 35 splits into two separately named interstate highways just north of Hillsboro, Texas. The routes fork to the northwest and northeast, with Interstate 35W taking the northwest route and Interstate 35E travelling off to the northeast toward Dallas. I-35W travels northwest past the Hillsboro airport through generally rolling farm and ranchlands. It then intersects with US Route 67 on the west side of Alvarado. It continues northwest into the southern edge of Fort Worth. At an intersection with State Highway 174 the route turns due north into greater Fort Worth, passing just west of Fort Worth Spinks Airport. Further north, the road reaches a five level interchange with Interstate 20. The route continues north, reaching downtown Fort Worth. Here it reaches intersections with Interstate 20, U.S. Highway 287, and U.S. Highway 377. I-35W travels north away from downtown concurrent with US 287, next intersecting Interstate 820 just east of Fort Worth Meacham International Airport. Just north of this intersection, US 287 splits to the northwest, along with the southern terminus of U.S. Highway 81. I-35W then gradually shifts to the northeast, passing Fort Worth Alliance Airport and Texas Motor Speedway. It reaches its northern merging point on the southwest side of Denton, merging back together with I-35E to reform Interstate 35, which continues off to the north.
| County |
Location |
# |
Destinations |
Notes |
| Hill |
|
|
I-35 south – Waco |
Southbound exit and northbound entrance |
|
3 |
FM 2959 |
|
|
7 |
FM 934 |
|
|
8 |
FM 66 – Itasca |
|
|
12 |
FM 67 – Covington |
|
| Johnson |
Grandview |
15 |
FM 916 – Grandview, Maypearl |
|
|
16 |
SH 81 south / County Road 201 – Grandview |
|
|
17 |
FM 2258 |
|
|
21 |
County Road 107, Barnesville Road – Greenfield |
|
| Alvarado |
24 |
  I-35 Bus. north / FM 1706 / FM 3136 – Alvarado |
|
| 26A |
US 67 – Cleburne, Dallas |
|
| 26B |
I-35 Bus. south – Alvarado |
Southbound exit and northbound entrance |
|
27 |
County Road 604, County Road 707 |
|
| Burleson |
30 |
FM 917 – Joshua, Mansfield |
|
| 32 |
Bethesda Road, Briaroaks Road |
|
| 35 |
Briaroaks Road, Hidden Creek Parkway |
Southbound exit and northbound entrance |
| 36 |
  Spur 50 / FM 3391 (Renfro Street) to SH 174 south / Hidden Creek Parkway |
|
| Tarrant |
37 |
SH 174 south (Wilshire Boulevard) – Cleburne |
No northbound exit |
| Fort Worth |
38 |
Alsbury Boulevard |
|
| 39 |
FM 1187 (Rendon-Crowley Road) / McAllister Road |
|
| 40 |
Garden Acres Drive |
|
| 41 |
Risinger Road |
|
| 42 |
Everman Parkway |
|
| 43 |
Sycamore School Road |
Northbound exit is via exit 42 |
| 44 |
Altamesa Boulevard |
No southbound exit |
| 45 |
I-20 – Abilene, Dallas |
Signed as exits 45A (west) and 45B (east) |
| 46A |
Felix Street |
Northbound exit is via exit 44 |
| 46B |
Seminary Drive |
|
| 47 |
Ripy Street |
|
| 48A |
Berry Street – TCU |
|
| 48B |
Morningside Drive |
Southbound exit and northbound entrance |
| 49A |
Allen Avenue |
Southbound exit is via exit 49B |
| 49B |
  
US 287 Bus. (Rosedale Street) |
|
| 51 |
  I-30 / US 287 south / US 377 south – Abilene, Dallas |
South end of US 287/US 377 overlap; signed as exits 51A (west) and 51C (east) northbound |
| 51B |
SH 180 east (Lancaster Avenue) – Downtown Fort Worth |
Southbound exit is via exit 51 |
| 52A |
Spur 280 – Downtown Fort Worth |
|
| 52B |
 US 377 north (Belknap Street) / SH 121 north (Airport Freeway) – DFW Airport |
North end of US 377 overlap |
| 52C |
Spur 347 west (Belknap Street) |
Southbound exit and entrance |
| 52D |
Pharr Street |
|
| 52E |
Carver Avenue |
Northbound exit and southbound entrance |
| 53 |
Northside Drive, Yucca Avenue |
|
| 54A |
SH 183 (Northeast 28th Street) |
Signed as exits 54A (east) and 54B (west) northbound |
| 54B |
Papurt Street |
Southbound exit and northbound entrance |
| 54C |
33rd Street, Long Avenue |
Northbound exit and southbound entrance |
| 56A |
Meacham Boulevard |
|
| 56B |
Melody Hills Drive |
Northbound exit and southbound entrance |
| 57 |
I-820 (Northeast Loop) |
Signed as exits 57A (east) and 57B (west) |
| 58 |
Western Center Boulevard |
|
| 59 |
Basswood Boulevard |
|
| 60 |
 US 81 north / US 287 north – Decatur |
North end of US 287 overlap |
| 62 |
North Tarrant Parkway |
Northbound exit and southbound entrance |
| 63 |
Heritage Trace Parkway |
|
| 64 |
Golden Triangle Boulevard, Keller-Hicks Road |
|
| 65 |
SH 170 east (Alliance Gateway Freeway) |
|
| 66 |
Westport Parkway |
|
| Denton |
67 |
Alliance Boulevard |
|
| 68 |
Eagle Parkway |
|
| 70 |
SH 114 – Dallas, Bridgeport |
|
| 72 |
Dale Earnhardt Way |
|
| Northlake |
74 |
FM 1171 – Flower Mound, Lewisville |
|
| Corral City |
76 |
FM 407 – Argyle, Justin |
|
| Argyle |
79 |
Crawford Road, Robson Ranch Road |
|
| Denton |
82 |
FM 2449 – Ponder |
|
| 84 |
FM 1515 (Bonnie Brae Street) |
Northbound exit and southbound entrance |
| 85A |
I-35E south – Dallas |
Northbound exit and southbound entrance |
| 85B |
West Oak Street |
Northbound exit and southbound entrance |
|
I-35 north – Oklahoma City |
Northbound exit and southbound entrance |