The Batley and Spen constituency office will remain open until Jo Cox’s successor is elected.
The constituency staff will be responsible for winding down the office and will work under the supervision of Halifax MP Holly Lynch.
They will also be able to provide assistance with matters that require urgent attention.
A spokesman for the office said: “No date has yet been set for the by-election but until then, Jo’s staff are very keen to do what they can to continue her good work.
“Jo worked very hard to help her constituents and would want them to go on getting any help they need.”
Constituents can contact the office in Batley, by calling 01924 910499 or by emailing firstname.lastname@example.org