http://www.cic.gc.ca/english/information/offices/canada/mississauga.asp
Spouses, common-law or conjugal partner and dependent children:
CPC Mississauga
P.O. Box 3000, Station A
Mississauga, ON
L5A 4N6
Other family class applications:
CPC Mississauga
P.O. Box 6100, Station A
Mississauga, ON
L5A 4H4
RPRF payments or other correspondence:
CPC Mississauga
P.O. Box 6100, Station A
Mississauga, ON
L5A 4H4
Courier address (no public drop-offs)
2 Robert Speck Parkway,
Suite 1200
Mississauga, ON
L4Z 1H8
Fax: 905-803-7392