Loop 203 (1948) The first use of the Loop 203 designation was in Collin County as a loop off then-proposed US 75 in
McKinney. On May 25, 1954, the route was unchanged, but was signed as US 75 Business after US 75 was rerouted. Loop 203 was cancelled on October 28, 1961, and removed from the highway system.
Loop 203 (1977) The next use of the Loop 203 designation was in Haskell County as a loop off US 277 in
Weinert. The route was signed as US 277 Business rather than Loop 203. Loop 203 was cancelled on June 21, 1990, and transferred to Bus. US 277. ==Loop 204==