Texas State Highway 123

State Highway 123
SH 123; mainline in red, business routes in blue
Route information
Maintained by TxDOT
Length	71.2 mi[1] (114.6 km)
Existed	by 1933[1]–present
Major junctions
South end	US 181 / Bus. US 181 / SH 80 in Karnes City
Major intersections	US 87 in Stockdale US 90 in Seguin I-10 in Seguin
North end	I-35 / Loop 82 in San Marcos
Location
Country	United States
State	Texas
Counties	Karnes, Wilson, Guadalupe, and Hays
Highway system
Highways in Texas Interstate US State Toll Loops Spurs FM/RM Park Rec
← SH 122 → SH 124

State Highway 123 (SH 123) is a north–south state highway in Texas, United States, that connects U.S Route 181 (US 181) in Karnes City with Interstate 35 (I-35) in San Marcos. The route was initially proposed in 1927 and has had minimal changes to its routing since then.