Description: Detailed large map of Idaho State, showing cities, towns, county formations, roads highway, US highways and State routes.
Map of Idaho, Idaho map with cities, counties, and roads network.This detailed map is the best map to follow if you want to understand Idaho by counties, cities, and the road network. We will travel as if we are standing at the top edge near Canada and tracing south along the state outline, then west to east across counties, all while pointing to the exact county colors, city dots, and red highway lines you see on the Idaho map with cities, counties, and roads network.
Starting at the slim northern tip where Idaho touches British Columbia in Canada, the county you see right against the border is Boundary County. On this map, Boundary County contains Bonners Ferry as the central labeled town. A short drive south on the north–south road that tracks the Kootenai River brings you into Bonner County, where Sandpoint sits by the large, blue lake-shaped Lake Pend Oreille - the highway west of Sandpoint links toward Washington and Spokane. The red arterial running east from Sandpoint climbs over the mountains into Montana, which you can see labeled to the right of the state boundary line.
Immediately south of Bonner County, the Idaho map shows a more populated hub in Kootenai County with Coeur d'Alene on the lake of the same name. The bold red interstate slicing across the county is I-90, Idaho's most important north–south highway. It connects Coeur d'Alene west to Spokane in Washington and east through the Silver Valley into Montana. Coeur d'Alene is surrounded by resort communities, forest-covered hills, and a web of surface routes leading to lakes and trailheads. This is a good visual checkpoint on the map because the lake outline and the I-90 line make Kootenai County easy to identify.
To the southeast, the long county that hugs the Idaho–Montana border is Shoshone County. Along I-90, you can trace a string of historic mining towns. The map places Shoshone's label along the mountains and river valleys that carry the interstate. South–southwest of there is Benewah County, with St. Maries written near the St. Joe River corridor. Latah County sits to the west and is marked by Moscow, home of the University of Idaho. The map depicts Moscow's position close to the Washington line and near the junction of surface highways that feed into the US-95 corridor, which is the vertical spine you can trace from the Canadian line down to southern Idaho.
As you move down the map, the mix of yellow and green county polygons shows Clearwater County and Nez Perce County. Clearwater includes Orofino, and the map even hints at the Dworshak Reservoir in a pale blue ink patch north of town. West of Clearwater, Nez Perce County is anchored by Lewiston, Idaho's inland port on the Snake River and a key road junction. You'll notice the Snake River doubles as part of the state boundary with Washington through this reach, and red highways branch from Lewiston toward the Camas Prairie and the US-95 ascent into the higher country.
Between these two sits the smaller Lewis County, with Nezperce marked near the county center on the map. South of Lewiston, the thin band of purple county area is Asotin County, Washington, shown only as a neighbor, which helps you visually orient the river canyon and the cross-state travel.
Running down the center is Idaho's namesake, Idaho County, one of the largest counties in the United States outside Alaska. On the map, you can see Grangeville labeled along US-95, and the vast interior is traced by blue river lines representing the Salmon River and its forks. The roads are sparse, as the map effectively communicates this with long gaps between red segments. This helps you understand why travel times across Idaho County are long, even if distances look short.
To the west of Idaho County, along the Snake River, the map places Adams County with Council and New Meadows road references near the valley floors. Southwest of Adams is Washington County, with Weiser, a town you see close to the Oregon line and a junction for US-95 and trans-Snake routes. Those county names help you pin the boundary with Oregon, which hugs Idaho's western edge from the panhandle down to the Owyhee high desert.
Near the lower left third of the map, the county colors cluster tightly and the red highway web thickens. This shows the Treasure Valley and Idaho's most extensive metro. Payette County includes Payette and sits along the confluence of more minor roads entering from Oregon. Immediately south, Canyon County is labeled around Caldwell and Nampa, even though the map foregrounds Caldwell more clearly. East–southeast is Ada County, which contains Boise, the state capital. You can see Boise marked boldly, with river meanders for the Boise River cutting through the valley. The heavy red line is I-84, Idaho's primary interstate that carries traffic from the Oregon border through Nampa, Meridian, Boise, and on toward Mountain Home and the Magic Valley. The map makes this corridor obvious thanks to the thickness of the line and the way it parallels the valley floor.
North of Boise, the polygon labeled Boise County stretches into the mountains. Places like Idaho City and the high country trailheads sit up here, and the roads on the map grow thin and curvy as they trace the ridgelines and river canyons. Gem County sits just to the northwest of Emmett, which you'll spot along a smaller network of feeder roads.
Moving northeast from Boise County, the long vertical county is Valley County, with Cascade and McCall on the Payette River drainage and Payette Lake shown in blue near McCall. The map helps you see how the valley road connects to Adams County near New Meadows and then to US-95 north–south traffic. East of Valley County, the larger peach polygon is Custer County, with Challis and the rugged Salmon–Challis region. You will see fewer road lines here, telling you that this is wilderness country dominated by river gorges and peaks like the Lost River Range to the east.
On the map's eastern center, Lemhi County hugs the Montana line and features Salmon as its county seat, where US-93 runs north–south linking the Lost Trail Pass to the south toward Challis and to the north into Montana. Trace the red highway in this area, and you will notice it follows river valleys because the peaks are high and the passes are limited.
Return to the Boise corridor and follow I-84 southeast. You first encounter Elmore County with Mountain Home marked and a road spur heading toward Bruneau and the Owyhee uplands. East of Elmore sits Camas County, a small yellow rectangle with Fairfield near the heart of the Camas Prairie. South of Camas lies Gooding County, home to Gooding, and to its east is Jerome County, with Jerome situated right along the interstate. The map then shows Twin Falls County with Twin Falls labeled close to the canyon carved by the Snake River. The famous Perrine Bridge corridor aligns with the red highway line through town. On the south side of the river, Cassia County includes Burley and Declo, and to its north, Minidoka County includes Rupert. Follow the red lines and you'll see I-84 running west–east and I-86 branching from Declo to American Falls.
At the same latitude but farther east, the teal block is Blaine County with Hailey and Ketchum in the Wood River Valley, plus Sun Valley ski country that the map hints at via road forks and the basin shape north of Hailey. Just southeast of Blaine, the compact light green polygon is Camas County, already noted, and further east, you reach Lincoln County with Shoshone. South of Blaine, you'll find Camas again on your way back toward Elmore. This knot of small counties illustrates how the map's color blocks and closely spaced town labels tell you the southern Snake River Plain is Idaho's most traveled corridor.
Drop back onto I-84 eastbound. After American Falls, the interstate meets I-15 at Pocatello in Bannock County. The map prominently marks Pocatello as a key junction city, with routes leading north to Idaho Falls and south to Utah. North of Bannock, Bingham County includes Blackfoot, and northeast is Bonneville County with Idaho Falls. The river line looping through Idaho Falls is the Snake River as it arcs around the city. East of Bonneville is Teton County, bordering Wyoming, and north of Teton is Fremont County with St. Anthony. Between Bonneville and Fremont lies Madison County, home to Rexburg. West of Madison is Jefferson County with Rigby, which this map references through road junctions, even if the city label is lighter.
Just south of Fremont and Madison is Clark County, a thin band along the Montana line with sparse roads and vast rangelands. Southwest of there lies Butte County with Arco, a node the map places along US-20 that also links west to Carey and the Wood River country. South of Butte, the map shows Power County with American Falls, and to its southeast, Caribou County with Soda Springs. Directly south along the Utah line is Oneida County with Malad City, Franklin County with Preston, and Bear Lake County with Montpelier near the famous turquoise lake that straddles Idaho and Utah. These county blocks help you visualize how the Snake River Plain bows around the southeast corner and how I-15 cuts a clean north–south line on the map with spurs to each county seat.
As you scan the outer frame, the map clearly shows Washington to the west of the panhandle, Oregon alongside the western and southwestern counties, and Nevada at the lower left. On the bottom edge are Utah in the south center and Wyoming on the southeast edge. To the right of Idaho, you see Montana along a long, rugged border, and at the top, the hatched band marks Canada. The road symbols demonstrate where the border crossings concentrate: Bonners Ferry north toward British Columbia, the I-90 corridor from Coeur d'Alene to Montana, US-93 from Salmon to Lost Trail Pass, and I-15 north from Idaho Falls toward Dillon, Montana.
Because this Idaho map with cities, counties, and a road network is detailed, it lets you confirm the most critical routes at a glance.
I-84: Oregon border to Boise, Nampa, and Caldwell, then to Mountain Home, Jerome, Twin Falls, Burley, and into Utah.
I-86: Splits near Declo and goes to American Falls, then rejoins I-15 near Pocatello.
I-15: Utah to Pocatello, Blackfoot, Idaho Falls, then north to Montana.
I-90: Spokane through Coeur d'Alene and the Silver Valley into Montana.
US-95: Canada through Bonners Ferry, Sandpoint, Coeur d'Alene area, Moscow, Lewiston, Grangeville, New Meadows, Council, Weiser, and south to the Oregon line.
US-12: Lewiston to Orofino and east over Lolo Pass toward Missoula, Montana.
US-93: Nevada line through Twin Falls and Shoshone to Challis and Salmon, then north to Montana.
US-20 and US-26: From the Oregon line through Boise and Mountain Home to Arco and Idaho Falls. Following these lines on the map reinforces how Idaho's cities cluster along the Snake River Plain and around the panhandle lakes, while central mountain counties show far fewer road connections.
For residents, travelers, and geography students, this map provides the most dependable frame for trip planning, permitting, and school district research. County boundaries define sheriff's offices, road departments, and public lands districts. On this Idaho map, the contrasting colors keep each county readable even where the shapes are narrow, such as Teton, Clark, and Shoshone, or broad, such as Idaho County and Owyhee County in the southwest. Owyhee appears in the bottom left corner as a large teal block with few town labels, indicating this is remote ranch and canyon country with long distances between services. That visual cue helps you plan fuel and lodging in places like Mountain Home, Twin Falls, or Jordan Valley in neighboring Oregon before you venture into Owyhee backroads.
We will now devote lines to each county as it appears on the attached map. Each entry lists the county seat or main city label that you can see, nearby towns if shown, and the key road or river patterns that the detailed map highlights. This keeps the writing perfectly aligned with what the user sees.
County seat and label on map: Bonners Ferry.
Map cues: River valley running west–east, road north to the Canadian border.
Travel note: Connects to US-95 south to Sandpoint and to border crossings toward British Columbia.
Primary city on the map: Sandpoint on Lake Pend Oreille.
Road pattern: Junction of US-95 with eastbound routes to Montana.
Map insight: Lake outline and bridges mark Sandpoint as a scenic hub.
City on map: Coeur d'Alene on its namesake lake.
Road: I-90 crosses the county west to east.
Neighbor cues: Spokane to the west in Washington and Silver Valley to the east.
Map highlight: Long, narrow county straddling I-90 in the mountains.
Function: Gateway between the panhandle and Montana's high passes.
City on map: St. Maries along the St. Joe River.
Road pattern: Local connectors to US-95 and mountain backroads.
City on the map: Moscow.
Geography: Palouse hills, farm roads, easy access to Washington State University across the line in Pullman.
City on map: Orofino.
Hydrology: Dworshak Reservoir is shown north of town.
Highway: US-12 corridor east toward Lolo Pass.
City on map: Lewiston.
Rivers: Snake and Clearwater meet here.
Travel: Junction of US-95, US-12, and routes into Washington.
City on map: Nezperce.
Context: A Small county between Nez Perce and Idaho counties on the Camas Prairie.
City on map: Grangeville.
Map feel: Massive, sparsely roaded interior, blue lines for the Salmon River.
Travel reality: Long scenic drives with limited east–west crossings.
Cities on the map: Council, New Meadows area reference.
Connector: US-95 links it to Weiser south and Riggins north.
City on map: Weiser at the Oregon line.
Role: Cross-border commerce and farm services.
City on map: Payette.
Network: Feeds into the US-95 and I-84 corridor via nearby counties.
City on map: Emmett.
Landscape: Foothill farms north of the Treasure Valley.
Cities on the map: Caldwell is prominently featured, and Nampa is located in the same metro area.
Highway: I-84 through the valley, multiple interchanges.
City on map: Boise.
Hydrology: Boise River through town and greenbelt corridor.
Travel: Dense connectors to Meridian, Eagle, and the foothills.
Map look: A mountainous county north of Ada, featuring thin, winding roads.
Use case: Access to Idaho City, rafting, and high-country trailheads.
Cities on the map: Cascade and McCall, Payette Lake in blue.
Highways: North–south route to Adams County and US-95 via New Meadows.
City on map: Challis.
Geography: Salmon River canyon, high peaks, remote passes.
Road reality: Fewer lines on the map mean slower travel.
City on map: Salmon.
Key route: US-93 to Lost Trail Pass and Challis.
Border: Long shared line with Montana.
City on map: Mountain Home.
Corridor: I-84 eastbound toward the High Desert and Air Force base area.
Spurs: Roads toward Bruneau and canyonlands.
City on map: Fairfield.
Context: Small county high on the prairie between Elmore and Blaine.
City on map: Gooding.
Ties: Short hops to Jerome and Twin Falls across the Snake River.
City on map: Jerome.
Interstate: I-84 straight line through irrigated farms.
City on map: Twin Falls.
Landmark: Snake River Canyon and bridge crossing.
Travel: Heart of the Magic Valley with spurs to waterfalls and parks.
City on map: Shoshone.
Junction: Connects US-93 north–south with east–west farm roads.
Cities on the map: Hailey and Ketchum.
Attractions: Sun Valley resort, Sawtooth gateway.
Roads: Wood River Valley route north to the mountain passes.
City on the map: Rupert.
Corridor: Along the Snake, agriculture grid, and canals.
City on map: Burley with Declo nearby.
Highways: I-84 and I-86 junction zone.
City on map: American Falls.
Feature: Reservoir visible as a blue water body at the river bend.
City on map: Arco.
Roads: US-20 toward Idaho Falls and west toward Craters of the Moon country.
Map read: Long, thin county on the Montana line with sparse roads.
Use: Backcountry travel awareness and services planning.
City near map corridor: Rigby area between Blackfoot and Rexburg.
Network: Feeder roads from I-15 to farms and river bends.
City on map: Rexburg.
Role: University town and stop between Idaho Falls and St. Anthony.
City on map: St. Anthony.
Gateway: Access to St. Anthony Dunes and routes to the Yellowstone region.
County seat area: Driggs–Victor corridor east of the Snake River Range.
Map pattern: Narrow north–south valley pressed against Wyoming.
City on map: Idaho Falls.
Interstates: I-15 through town, US-20 east toward the parks.
City on map: Blackfoot.
Rivers: Snake River curves near town, irrigation canals marked in blue.
City on map: Pocatello.
Node: Where I-86 meets I-15, rail yards, and university hub.
City on map: Soda Springs.
Geology: Carbonated springs and phosphate country.
City on map: Malad City.
Border: Direct link to Utah on I-15.
City on map: Preston.
Corridor: Agricultural valley at the lower east border with Utah.
City on map: Montpelier.
Feature: Bear Lake shoreline south–southeast with resort roads.
Map identity: Huge southwestern county with very few labels.
Travel lesson: Distances are long, so plan fuel stops at Mountain Home, Nampa, or Jordan Valley in Oregon.
This county roll call demonstrates how the Idaho map, with its cities, counties, and road network, effectively communicates travel reality through color blocks, water bodies, and a clear hierarchy of red highway lines. Use it to plan the exact county you will pass through, the nearest seat for services, the interstate to join, and the river canyon that controls your route.
Forty-four counties, each shaded with a clear label and county seat.
County boundaries and county seats, with a light road network only for orientation.
Boise in Ada County; the county seat is Boise.
I-84 passing Caldwell, Nampa, Boise, Mountain Home, Jerome, Twin Falls and Burley.
US-95 from Boundary County to the Treasure Valley.
The Snake River, visible along the Oregon and Idaho lines and through the Magic Valley.
Kootenai County; the seat is Coeur d'Alene.
Nez Perce County; Lewiston is the county seat on the Clearwater–Snake confluence.
Bonneville County; Idaho Falls is the county seat on the Snake River plain.
Bannock County; Pocatello is the county seat with I-15 shown lightly nearby.
Twin Falls County; the seat is Twin Falls near Shoshone Falls.
Ada County (seat Boise) and Canyon County (seat Caldwell); Nampa and Meridian are labeled in Canyon and Ada.
Blaine County; the county seat is Hailey.
Valley County; the county seat is Cascade on the Payette River corridor.
Bonner County; Sandpoint is the county seat on Lake Pend Oreille.
Latah County; Moscow is the county seat and a university town.
Shoshone County; Wallace is the county seat along I-90’s light alignment.
Clearwater County; Orofino is the county seat on the Clearwater River with US-12 shown quietly.
Grangeville, with the Salmon River canyons defining much of the county.
Lemhi County; US-93 is the light orientation line to Montana.
Custer County; Challis is the county seat near the Lost River Range.
Power County; American Falls is the county seat on the reservoir.
Bingham County; Blackfoot is the county seat north of Pocatello.
Madison County; Rexburg is the county seat along US-20.
Teton County; Driggs is the county seat on the Wyoming line.
Fremont County; St. Anthony is the seat north of Rexburg.
Cassia, Oneida, Franklin and Bear Lake Counties.
Owyhee, Canyon, Payette, Washington, Adams and Idaho Counties.
Boundary, Bonner, Kootenai, Shoshone, Clearwater, Idaho, Lemhi, Clark and Fremont.
Group counties by river basins and valleys, then use thin cues for I-84, I-15, US-95, US-93 and US-12 to see regional connections.
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