Ever since its found­ing in 1925 the “head­quar­ters” of the IARU has been pro­vid­ed by the ARRL, the nation­al asso­ci­a­tion for ama­teur radio in the Unit­ed States. Under the cur­rent IARU Con­sti­tu­tion this func­tion is called the Inter­na­tion­al Sec­re­tari­at. The ARRL is the largest of the IARU mem­ber-soci­eties and has the largest full-time staff, and so is in the best posi­tion to pro­vide con­ti­nu­ity and funding.

The mail­ing address of the Inter­na­tion­al Sec­re­tari­at is P.O. Box 310905, New­ing­ton, CT 06131 – 0905 USA. The phys­i­cal address is that of ARRL Head­quar­ters: 225 Main Street, New­ing­ton, CT 06111 USA. Email: iaru@iaru.org.

The IARU Con­sti­tu­tion and Bylaws set out the pro­ce­dure for the selec­tion of anoth­er mem­ber-soci­ety to serve as the Inter­na­tion­al Sec­re­tari­at should that become nec­es­sary or desirable.