| Abbreviation | Definition |
|---|---|
| ACMEA | Alameda County Management Employee Association |
| ACMG | Alameda County Master Gardeners |
| ACMSA | Allegheny County Medical Society Alliance |
| ACMSF | Allegheny County Medical Society Foundation |
| ACND | Aransas County Navigation District |
| ACPA | Allegheny County Port Authority |
| ACPAA | Arapahoe County Public Airport Authority |
| ACPD | Albemarle County Police Department |
| ACPL | Athens County Public Libraries |
| ACPS | Albemarle County Public Schools |
| ACPS | Amherst County Public Schools |
| ACR | Alton County Railways |
| ACRA | Amador County Recreation Agency |
| ACRC | Anoka County R/C |
| ACRWC | Addison County River Watch Collaborative |
| ACS | Anderson County Schools |
| ACSA | Albemarle County Service Authority |
| ACSA | Augusta County Service Authority |
| ACSO | Alachua County Sheriff's Office |
| ACSO | Alameda County Sheriff's Office |