Idaho Cities:
- Cambridge
- Cameron
- Canyon Creek
- Cardiff
- Carey
- Careywood
- Carlin Bay
- Carmen
- Cascade
- Castleford
- Cataldo
- Cavendish
- Centerville
- Central
- Challis
- Chatcolet
- Cherry Creek
- Chester
- Chesterfield
- Chilco
- Chilly
- Chubbuck
- Churchill
- Clagstone
- Clark Fork
- Clarkia
- Clarksville
- Clawson
- Clayton
- Clearwater
- Clementsville
- Cleveland
- Cliffs
- Clifton
- Clover
- Clyde
- Cobalt
- Cocolalla
- Coeur D'alene
- Coeur D'alene Indian Reservation
- Colburn
- Cole Village
- Collister
- Coltman
- Conda
- Conkling Park
- Connor
- Coolin
- Copeland
- Copperville
- Cornwall
- Corral
- Cotterel
- Cottonwood
- Council
- Craigmont
- Craters Of The Moon National Monument
- Crescent
- Crouch
- Crystal
- Culdesac
- Culver
- Cuprum
- Curry
- Dalton Gardens
- Daniels
- Darlington
- Davis Acres
- Dayton
- De Smet
- Deary
- Declo
- Deep Creek
- Delta
- Dietrich
- Dingle
- Dixie
- Doles
- Donnelly
- Dover
- Downey
- Driggs
- Drummond
- Dubois
- Duck Valley Indian Reservation (also Nv)