An initiative of affiliation to ICOS was begun in April 2008. The following organisations are currently affiliated to ICOS:
- Adriatic Onomastic Research Centre, University of Zadar (Croatia)
- American Name Society (United States)
- Australian National Placenames Survey
- Center of Onomastics,Technical University of Cluj-Napoca (North University Centre of Baia Mare, Romania)
- Commission of Slavic Onomastics (Poland)
- Deutsche Gesellschaft für Namenforschung (GfN) e.V. (Germany)
- English Place-Name Society
- Forschungsstelle für Namenkunde (University of Berne, Switzerland)
- Names Society of Southern Africa
- NORNA (Nordic region)
- Onomastic Board of the Croatian Academy of Arts and Sciences
- Onomastic Commission of the Czech Republic
- Onomastica e Letteratura (University of Pisa, Italy)
- Polish Council of Onomastics
- Polish Onomastic Society (Polskie Towarzystwo Onomastyczne) (Poland)
- Scottish Place-Name Society | Comann Ainmean-Àite na h-Alba
- Slovak Onomastic Commission
- Société française d’onomastique (France)
- Society for the Study of Names in Nigeria
If you wish your organisation to be affiliated to ICOS, and thereby to
enter into an arrangement for exchanging information electronically,
please contact the Secretary.