United States Abbreviations and Acronyms

1. IRB
   Iraan Municipal Airport, Iraan, Texas, United States
2. IRC
   Circle City /New/, Circle, United States
3. IRK
   Kirksville Regional Airport, Kirksville, Missouri, United States
4. IRO
   International Relations Organization
5. IRS
   U.S. Internal Revenue Service
6. IRS
   Kirsch Municipal Airport, Sturgis, Michigan, United States
7. ISAC
   Interfaith Social Action Coalition
8. ISC
   Johnson Space Center
9. ISC
   Inter-Sorority Council
10. ISI
    Institutetute for Scientific Information
11. ISI
    International Students, Inc.
12. ISM
    Kissimmee Gateway Airport, Orlando, Florida, United States
13. ISN
    Sloulin Field International Airport, Williston, North Dakota, United States
14. ITC
    United States International Trade Commission
15. ITH
    Ithaca Tompkins Regional Airport, Ithaca, New York, United States
16. ITO
    Hilo International Airport, Hilo, Hawaii, United States
17. ITV
    Improved TOW Vehicle (US)
18. IU
    Indiana Universityrsity
19. IUB
    Indiana University Bloomington's
20. IUOP
    Indiana University of Pennsylvania

Last updated: September 22, 2021 — Total entries: 5,551