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County Highway

Number	Southor west terminus	North or east terminus	Length (mi)^[1]	(km)	Cities or Areas served	Notes
A1	SH-28 near Mud Lake	SH-22 near Lily Hot Springs	18.207	29.301	Monteview.	known as Monteview Highway.
A2	US 20 near Macks Inn	I-15 near Dubois	999.999	1,609.342	Kilgore.
A3	US 20 near Idaho Falls	SH-48 near Lewisville	999.999	1,609.342	Lewisville	known as Lewisville Highway.
A4	I-15 near Lewisville	SH-48 in Ririe	999.999	1,609.342	Ririe	known as Ririe Highway.
D1	SR-23 at Utah state line south of Weston	US 91 near Downey	999.999	1,609.342	Oxford, Clifton, Dayton, Weston
G3	near the Magic Mountain Ski area	US 30 in Hansen	999.999	1,609.342	Rock Creek Canyon, Magic Mountain Ski area.	Rock Creek Scenic Byway
K1	SH-55 near Caldwell	I-84 in Caldwell	999.999	1,609.342	Caldwell	10th Ave South
K3	SH-55 near Caldwell	SH-19 in Caldwell	999.999	1,609.342	Caldwell	Farmway Road
P1	SH-7 in Ahsahka	SH-3 near Kendrick	999.999	1,609.342	Southwick, Cavendish	Formerly State Highway 7
P2	US 12 in Lewiston	US 95 near Sweetwater	999.999	1,609.342	Lewiston	An alternate highway to Lewiston
P3	US 12 in Myrtle	US 95 near Craigmont	999.999	1,609.342	Gifford and Reubens

County Highway System

The County highway system in Idaho currently has 11 signed county routes. These routes are assigned a letter prefix depending on their location throughout the state, Much like the County Highway System in California. Though there are not specific milepoint logs for the county highways with the Idaho Department of Transprotation, there are some references to these highways in the state milepoint logs, and on the official Idaho State Highway Map^[2] and in the current versions of the Rand McNally Road Atlas.^[3]

The Prefix Regions currently used are:

A = Eastern Idaho (Idaho Falls)
D = Eastern Idaho (Preston)
G = South Central Idaho (Twin Falls)
K = Southwestern Idaho (Caldwell)
P = North Central Idaho (Lewiston)

Idaho County Highways

A1

County Highway A1 or A1 passes through Monteview in eastern Idaho. The highway is 18.290 miles long. Its northern terminus is with State Highway 22 (Milepost 53.155) near Lidy Hot Springs, and its southern Terminus is with State Highway 28 (Milepost 17.700). This road is known as STC 6755 on the Idaho state Milepoint Log, and locally as Monteview Highway.

A2

County Highway A2 or A2

A3

County Highway A3 or A3

A4

County Highway A4 or A4

D1

County Highway D1 or D1

G3

County Highway G3 or G3

K1

County Highway K1 or K1

K3

County Highway K3 or K3

P1

County Highway P1 or P1

P2

County Highway P2 or P2

P3

County Highway P3 or P3

References

^ "Idaho Milepoint Log". Idaho Transportation Department. 2008-02-01. Retrieved 2008-05-24. {{cite web}}: Cite has empty unknown parameter: |coauthors= (help)
^ Idaho Official Highway Map (Map) (2004, 2006 ed.). Rand McNally & Co.
^ The Road Atlas '07 (Map) (2007 ed.). Rand McNally & Co. p. 31.

[milepointlog-1] "Idaho Milepoint Log". Idaho Transportation Department. 2008-02-01. Retrieved 2008-05-24. {{cite web}}: Cite has empty unknown parameter: |coauthors= (help)

[2] Idaho Official Highway Map (Map) (2004, 2006 ed.). Rand McNally & Co.

[3] The Road Atlas '07 (Map) (2007 ed.). Rand McNally & Co. p. 31.

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[2]

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