| 1LR | Residential Line | |
| AARC | African American Residential Caucus | |
| AARO | Association of Americans Resident Overseas | |
| ABCD | Asset-Based Community Development | |
| ACRC | Arapahoe County Residential Center | |
| AIRD | Appraisal Institute Residential Database | |
| AIRPM | Associate of the Institute of Residential Property Management | |
| AIRS | AIDS Interfaith Residential Services | |
| ALRC | Assisted Living and Residential Care | |
| ALRPS | Assisted Living Resident Profile Survey | |
| AMHR | Advanced Mental Health Resident | |
| AMRP | Alarm Management Resident Process | |
| APRC | Alien Permanent Resident Certificate | |
| APRC | Awaiting Placement for Residential Care | |
| APRIL | Association of Programs for Rural Independent Living | |
| APRJC | Andhra Pradesh Residential Junior Colleges | |
| APRJC | A P Residential Junior Colleges | |
| APRSK | Andhra Pradesh Residential School, Kodigenahalli | |
| APTWR | Andhra Pradesh Tribal Welfare Residential | |
| AR | Arkansas Resident | |
| ARA | Assistant Resident Advisor | |
| ARC | Artists Residents Chicago | |
| ARCF | Adult Residential Care Facility | |
| ARCH | Area Residents Caring and Helping | |
| ARCP | American Residential Cleaning Professions | |
