56 Ill. Adm. Code 2720.35
A Claimant's "Last Known Address"
Section 2720.35 A Claimant's "Last Known Address"
Notwithstanding any provision to the contrary, a claimant's "last
known address", as that term is used in the Act, is the last address
provided to the Department by the claimant as provided in this Section. The
address provided by a claimant on his or her most recent unemployment insurance
claim application is the claimant's last known address until the claimant
informs the Department of a change of address by telephone or in person at any
local office, or through the internet at the Department's website,
www.ides.illinois.gov. The telephone number for submitting a change of address
can be found on the Department's website. Noting a change of address on an
appeal or other correspondence is not sufficient to change one's "last
known address".