That's also because I can't find recent taxfiler data at the census tract level.
Here is median family income.
Halton and Peel:
Tract 601 (Oakville) $189,360
Tract 506 (Mississauga) $186,670
Tract 602 (Oakville) $171,480
Tract 505.02 (Mississauga) $167,230
Tract 600.01 (Oakville) $166,800
Tract 505.01 (Mississauga) $161,990
Tract 216 (Burlington - part of Hamilton CMA) $141,410
Tract 612.09 (Oakville) $139,810
Tract 219 (Burlington - part of Hamilton CMA) $133,970
Tract 609 (Oakville) $133,280
York Region:
Tract 442.03 (Aurora) $145,970
Tract 450.06 (Newmarket) $140,040
Tract 403.05 (Unionville) $137,340
Tract 410.05 (Thornhill) $130,360
Tract 402.05 (Thornhill) $129,320
Tract 412.14 (Woodbridge) $127,370
Tract 441.04 (Aurora) $125,470
Tract 412.18 (Woodbridge) $118,080
Tract 412.15 (Woodbridge) $117,740
Tract 451.05 (Newmarket) $117,460
So Oakville is basically our Greenwich, Connecticut.