US Government Civilian Ribbons Charts
[1] 
Gov01-ABMC_AF_ACDA
[ABMC]   American Battle Monument Commission
[AF]         Department of the Air Force-Civil Service Awards
[AF]         Air Force-Public Service Awards-Other Civilian Awards
[AF]         Air Force Junior ROTC Instructor Awards
[ACDA]   Arms Control and Disarmament Agency - Type 2 Ribbons
                was [USIA] Information Agency-Type 1- [obsolete] now [ACDA]
[2]
Gov02_Army-DoD
[DoD]    Department of Defense
[OSD]    Office of Secretary of Defense
[JCS]    The Joint Chiefs of Staff,Chairman of the JCS Awards
[DoA]    Depart. of the Army-Public Service Awards
                                            -Civil Service Awards
                                            -Miscellaneous Civilian Awards
[3]
Gov03-BP
[BATF]      Bureau of Alcohol, Tobacco, Firearms, & Explosives
[CBP]     Customs and Border Protection-was [BP]   
[BP]        Border Patrol [obsolete]
[CGS]      Coast and Geodetic Survey
[CIA]       Central Intelligence Agency
[CSB]      Chemical Safety & Hazard Investigation Board
[4]
CG_CGA
Coast Guard Civilian and Coast Guard Auxillary


[5]
Gov3a-Navy
Navy
[MSC]      Military Sealift Command
[6]
Gov6_DARPA
[DARPA]      Defense Advanced Research Projects Agency
[DASA]        Defense Atomic Support Agency
                          replaced by   [DNA] Defense Nuclear Agency
[DAU]             Defense Acquistion University
[DCA]           Defense Communications Agency Replaced by [DISA]
(DCAA)       Defense Contract Audit Agency
[DCMA]         Defense Contract Management Agency
[DCPMS]     Defense Civilian Personnel Management Service
                      Replaced by [DCPAS] Defense Civilian Personnel Advisory Service
DCPA)           Defense Civil Preparedness Agency, replaced by [FEMA]

[7]
Gov07-DeCA
[DEA]       Drug Enforcement Administration
[DeCA]     Defense Commissary Agency
[DHS]       Department of Homeland Security
[DIA]        Defense Intelligence Agency
[DIS]        Defense Investigative ServiceDARPA
                replaced by [DSS] Defense Security Service
 [DISA]        Defense Information Systems Agency
[8]
 Gov08-DLA
[DLA]           Defense Logistics Agency
[DMA]          Defense Mapping Agency replaced by NIMA
[DNA]       Defense Nuclear Agency
[DoC]        Department of Commerce
[DoE]        Department of Energy
[DHHS]     Department of Health and Human Services
                    Assistant Secretary for Health
 [DoJ]        Department of Justice
[9]
Gov09-DoJ    
[OAG]         US Attorney General
 [FBI]           Federal Bureau of Investigation
 [FBP]          Federal Bureau of Prisons
DoS]        Department of State
[DOT]        Department of Transportation
                  Secretary of Transportation

[10]
Gov10-DoT_FAA
[DOT]      [FAA] Federal Aviation Administration
                replaced [DCPA] Defense Civil Preparedness Agency
[DPAA]    Defense POW/MIA Accounting Agency
DSS         Defense Security Service
                 replaced  [DIS] Defense Investigative Service
(DSWA)   Defense Special Weapons Agency
                 Replaced by [DTRA]
[DTIC]      Defense Technical Information Center
[DTRA]    Defense Threat Reduction Agency
[11]
Gov11-EPA
[EPA]    Environmental Protection Agency
[GAO]   Government Accounting Office
[FEMA] Federal Emergency Management Agency
[MM]     Merchant Marine is [DoT]-Maritime Administration
[12]
Gov10-NASA
[NASA] National Aeronautics and Space Administration
[NACA] National Advisory Committee for Aeronautics
               1915-1958 replace by [NASA]
[13]
Gov11-NCS

[NCS]       National Communications System
(NGA)      National Geospatial-Intelligence Agency
(NIMA)     National  Imagery & Mapping
                  replaced by National Geospatial-Intelligence Agency [NGA]
[NOAA]   National Oceanic and Atmospheric Admin.

[14]
Gov12-NRO

[NRO]            National Reconnaissance Office
[NSA/CSS]    National Security Agency-Central Security SVC.
[ODNI]           Office of the Director National Intelligence
[NIC]          National Intelligence Community

[15]
Gov15-IG
[OIG]         Office of the Inspector General
(OPM)       Office of Personnel Management
(OSIA)       On-Site Inspection Agency
[OoP]        Office of the President
(OPS)        Office of Protection Services  - Smithsonian Institution
[SSS]        Selective Service System
(USUHS)   Uniformed Services University of the Health Sciences
[16]
Gov16-PHS
[DHHS]      Department of Health and Human Services
[PHS]         Public Health Service


[17]
Gov17-AID
[USAID]     US Agency for International Development
[USIA]        United States Information Agency
[VA]         Veterans Administration 

U.S. Milspec Ribbons
600-700

Civilian Medals for Service in Operational Theaters


US Government Civilian Ribbons Charts
 Office of the President of the United States

United States Intelligence Community
National Intelligence Community Awards, Public Service Awards, Special eligibility awards, others
Central Intelligence Agency

Department of Commerce

National Oceanic and Atmospheric Administration

Coast and Geodetic Survey

Department of Defense
 Awards for civilian service, Office of the Secretary of Defense-level awards for civilian service and for private citizens,
Joint Chiefs of Staff [JCS]
DOD Office of the Inspector General (OIG)
Defense Investigative Service [DIS] 1971 became [DSS]
Defense POW/MIA Accounting Agency [DPAA]
Army, Air Force, Navy
Military Sealift Command [MSC]
Defense Commissary Agency [DeCA]
Defense Contract Audit Agency
Defense Contract Management Agency (DCMA)
Defense Information Systems Agency [DISA]
Defense Intelligence Agency [DIA]
Defense Logistics Agency [DLA]
Defense Supply Agency [DSA]
Defense Security Service (DSS) 1999 transferred to the Office of Personnel Management (OPM)
Realignment to Defense Counterintelligence and Security Agency [DCSA] 2016
Defense Threat Reduction Agency [DTRA]
Formerly the Defense Special Weapons Agency [DSWA]

National Geospatial-Intelligence Agency [NGIA]
Formerly the National Imagery and Mapping Agency [NIMA]

National Reconnaissance Office [NRO]
National Security Agency [NSA]
Uniformed Services University of the Health Sciences [USUHS]
Department of Energy [DoE]

Department of Health and Human Services
Public Health Service [PHS]

Department of Homeland Security
 U.S. Customs and Border Protection [CBP]
Federal Emergency Management Agency [FEMA]
U.S. Coast Guard [USCG]

Department of Justice
Bureau of Alcohol, Tobacco, Firearms, and Explosives [BATF]
Drug Enforcement Administration [DEA]
Federal Bureau of Investigation [FBI]
Federal Bureau of Prisons [FBP]

Department of State [DoS]
Arms Control and Disarmament Agency [ACDA] -1961 to 1999 transferred to Dept. of State
 United States Information Agency [USIA]

Department of Transportation [DoT]
Federal Aviation Administration [FAA]
Maritime Administration [MA] has Merchant Marine [MM]

American Battle Monuments Commission [ABMC] 

Environmental Protection Agency [EPA]

National Aeronautics and Space Administration (NASA)

Defense Civilian Personnel Advisory Service [DCPAS]

 Selective Service System

 United States Agency for International Development [AID]

 Smithsonian Institution (SI)

  Many of these Government Ribbons I don't have and do not think they can be had as a stand alone ribbon.

What I was told is that when some of the Ribbons/Medals are/were manufactured, the contracting Agency controlled the Ribbon
and gave enough of it to the Medal maker for the amount of Medal sets being made and any left over ribbon had to be returned.

An example of this was the Border Patrol Ribbons,  designed by the U S Border Patrol in 1999. Most of these were never produced in production quantities and an exceptionally limited number were ever awarded to members of the U S Border Patrol. After Sept 11, the Border Patrol was placed under the Department of Homeland Security and issuance of all of these medals was stopped. A proposal made for new designs using DHS logo was never approved and the entire program has been stopped, there have been some sets sold from left over stock which was obtained from the maker.

So for Ribbon Collectors the only way to get some of these Ribbons was to:
A-Buy the set, take out the Ribbon bar and keep or re-sell the rest
B-Buy the Medal and take off the Drape to make up ribbon Bars.