| State: | ID |
| Route: | 19 |
| Map Custom: | yes |
| Map Notes: | SH-19 highlighted in red |
| Type: | SH |
| Length Mi: | 20.855 |
| Length Ref: | [1] |
| Direction A: | West |
| Terminus A: | near Homedale |
| Junction: | in Wilder |
| Direction B: | East |
| Terminus B: | in Caldwell |
| Previous Type: | SH |
| Previous Route: | 16 |
| Next Type: | US |
| Next Route: | 20 |
| Counties: | Canyon, Owyhee |
State Highway 19 (SH-19) is a state highway in Idaho from the Oregon state line to Interstate 84 (I-84) and U.S. Route 30 (US 30) in Caldwell. SH-19 is signed as an east–west highway.
Its western terminus is at the Oregon state line; the highway continues west then north as Oregon 201. After passing through Homedale, it is concurrent with US 95 to Wilder. SH-19 then turns east, passing through Greenleaf before ending at I-84 in Caldwell.
SH-19 was extended through downtown Caldwell to an interchange with I-84 in 2022 as part of a long-term relinquishment of I-84 Business to the city government.[2]
| State: | ID |
| Type: | SH-Conn |
| Route: | 19 |
| Length Mi: | 0.045 |
| Location: | Caldwell |
State Highway 19 Connector is a short one-way route connecting SH-19 and I-84 Bus.