In northern Abilene, the highway runs near the western shore of Fort Phantom Hill Lake, leaving the city limits north of the FM 1082 intersection.

FM 600 runs through rural areas of Jones County, intersecting US 180 east of Anson and has a short overlap with SH 6 through the town of Avoca.

[17] It proceeds north, passing through the community of Eula and crossing FM 18 before reaching its northern terminus at exit 297 of I-20 west of Clyde.

A previous route numbered FM 606 was designated in Jones County on July 26, 1945, from US 180 at Boyds Chapel 4 miles (6.4 km) north to Hamlin Lake.

The route is primarily rural and does not go through any major cities or communities, other than passing just east of Taylor, where it has a brief concurrency with FM 112 and crosses US 79.

Farm to Market Road 624 (FM 624) is located in La Salle, McMullen, Live Oak, Jim Wells, and Nueces counties.

On March 24, 1958, the road was extended north to Plymouth Oil Field, replacing FM 1068 and completing its current route.

RM 648 was designated on August 21, 1945, as Farm to Market Road 648 (FM 648), running from US 87 northwest to Doss and then north 2.8 miles (4.5 km).

[85] The highway enters Webb County and passes through Mirando City before reaching its northern terminus at SH 359 west of Oilton.

Ranch to Market Road 652 (RM 652) is a 58.6-mile-long (94.3 km) route in Culberson, Reeves, and Loving counties near the New Mexico state line.

On July 25, 1960, the western terminus was adjusted, so that RM 652 now met US 62 north approximately 10.0 miles (16.1 km) northeast of Pine Springs.

The road itself is approximately 5 miles (8.0 km) long, and at the western terminus, two spurs to the north and south provide prison access.

[107] FM 660 begins in rural eastern Ellis County at an intersection with SH 34 just over 1 mile (1.6 km) east of Ennis.

It travels northbound from the east–west stretch of SH 34, bridging Fourmile Creek before it banks east as it merges onto Crisp Road.

[115][nb 10] It crosses I-35E again (passing over the Boxcar Willie Memorial Overpass) and also SH 342 in Red Oak before terminating at FM 983 near Ferris.

[120] The route travels to the south along Cameron Street before turning to the east, and passes Alice International Airport before entering Nueces County.

Approximately 6 miles (9.7 km) north of Gail is a junction with FM 2350, which leads to Fluvanna and the Brazos Wind Ranch, to the east.

Farther north, near the Borden–Garza county line, FM 669 reaches a high point that divides the drainage of the upper Brazos and Colorado rivers.

Less than a mile north of the county line is a historical marker that describes an archaeological site where the "Garza Point" was first identified.

These distinctive arrowheads were constructed from local flint, chert, and obsidian by Native Americans living and hunting in this area around A.D. 1440 to 1500.

[141] Around 5 miles (8.0 km) north of the Borden–Garza county line, FM 669 crosses the Double Mountain Fork, a major tributary of the upper Brazos River.

[142] From the colorful sandy bed of the Double Mountain Fork, FM 669 climbs 450 feet (140 m) over a distance of 6 miles (9.7 km) as it ascends the Caprock to the high plains of the Llano Estacado.

FM 670 was designated on November 28, 1945, to run from US 80 (later SL 333; now BI 20-H) in Westbrook north and west 3.7 miles (6.0 km) to Butler Camp.

The highway travels in a generally eastern direction along Mile 5 Road and intersects SH 364 in La Homa, then enters Alton.

[159] The route's designation was extended further northward to 3 miles (4.8 km) north of Capps Corner on December 2, 1953, and to Illinois Bend on September 29, 1954; the same day also so the lengthening to Forestburg.

A previous route numbered FM 680 was designated on February 21, 1946, as an extension of Georgia Street in Amarillo, from the Potter County line south to US 87.

[174] The route runs north to Sanford, where it begins a concurrency with RM 1319 northwestward into the Lake Meredith National Recreation Area.

After exiting the recreational area, RM 687 travels northeast through unincorporated portions of the county to its northern terminus at SH 152 west of Stinnett.

[173][175] RM 687 was designated as Farm to Market Road 687 (FM 687) on June 4, 1946, from SH 136 north 6.8 miles (10.9 km) to Sanford.

Farm to Market Road 695 (FM 695) runs from US 54, northeast of Dalhart, eastward and southward a distance of approximately 3.324 miles (5.349 km).