Entering Rockwall County, the highway enters the town of McLendon-Chisholm. In the community, FM 548 shares a short overlap with SH 205. Exiting the town, the highway continues to run in a northeast direction, before making a nearly 90-degree turn to the northwest. Just south of the intersection with SH 276, FM 548 turns to the north, entering Royse City a few miles to the north. The highway intersects with I-30 before ending at SH 66 in downtown.
