Idaho State Highway 66

{{Short description|State highway in Latah County, Idaho, United States}}

{{Use mdy dates|date=January 2025}}

{{Infobox road

|state=ID

|type=SH

|route=66

|map={{maplink|frame=yes|plain=yes|frame-align=center|frame-width=290|frame-height=310|type=line|raw={{Wikipedia:Map data/Wikipedia KML/Idaho State Highway 66}}}}

|map_custom=yes

|map_notes=SH-66 highlighted in red

|maint=ITD

|length_mi=0.992

|length_round=3

|length_ref={{cite web|title=State Highway 66 Milepoint Log|url=http://itd.idaho.gov/highways/milepointlog/mplog/StateHighway66.html|publisher=Idaho Transportation Department|accessdate=April 29, 2012|archive-url=https://web.archive.org/web/20120512104649/http://itd.idaho.gov/highways/milepointlog/mplog/StateHighway66.html|archive-date=May 12, 2012|url-status=dead}}

|direction_a=West

|terminus_a=Palouse Cove Road at Washington state line

|direction_b=East

|terminus_b={{jct|state=ID|US|95}} near Viola

|counties=Latah

|previous_type=SH

|previous_route=64

|next_type=SH

|next_route=67

}}

State Highway 66 (SH-66) is a state highway located entirely within Latah County, Idaho, United States. It travels for less than {{convert|1|mi|km|spell=in}} from Palouse Cove Road at the Washington state line to U.S. Route 95 (US-95) north of Viola. The highway is maintained by the Idaho Transportation Department.