Publisher
- Coast and Geodetic Survey (Commerce and Labor Department)201
- Coast and Insular Survey Committee3
- Coast guard3
- Coastal Plains Regional Commission2
- Coinage Joint Commission1
- Coinage, Weights and Measures Committee130
- Coinage, Weights and Measures Committee, House134
- Colorado Coal Commission1
- Colorado River Board1
- Colorado River Interstate-Governmental Commission2
- Colorado, Department of the4
- Colorado, Department of the (War Department)1
- Columbia Basin Inter-Agency Committee1
- Columbia Institution for Deaf and Dumb9
- Columbia Institution for Instruction of Deaf and Dumb3
- Columbia Institution for Instruction of Deaf and Dumb (Interior Department)1
- Columbia Institution for the Deaf31
- Columbia Institution for the Instruction of the Deaf and Dumb2
- Columbia, Department of the2
- Columbus Memorial Commission1