These six segments are located in Tylertown, Columbia, Hattiesburg, Beaumont, McLain, and Lucedale.

MS 198 is legally defined in Mississippi Code § 65-3-3 as the designation for former sections of US 98 that have been relocated by the completion of new alignments.

The highway passes more businesses before leaving the downtown and heading into wooded areas with some homes.

Here, the highway heads past several businesses before turning east onto Broad Street.

From this interchange, MS 198 heads east into Forrest County on Hardy Street, a four-lane divided highway that passes several businesses.

The highway passes to the south of the University of Southern Mississippi before ending at an intersection with US 49.

The highway heads through dense forests, curving southeast near a few homes as it runs a short distance to the southwest of Canadian National's Beaumont Subdivision railroad line.

The road passes through more forests before entering Beaumont, where it heads near a mix of residences and businesses.

The road heads through dense forests with some homes, passing under Canadian National's Beaumont Subdivision railroad line.

The highway continues through more rural areas, heading more to the east and passing under MS 63, at which point the railroad tracks run immediately to the north of the road.

MS 198 curves southeast away from the tracks into more forests, eventually entering Lucedale.

The road heads through wooded areas of homes before turning east and passing through the commercial downtown.

The road leaves Lucedale, crossing the Canadian National line and heading into a mix of farmland and woodland with some development.

[18] In 1941, the portions of road in Hattiesburg, east of Beaumont, in McLain, and northwest of Lucedale were paved.

[27] By 1998, MS 198 was marked on the six former alignments of US 98 in Tylertown, Columbia, Hattiesburg, Beaumont, McLain, and Lucedale.