I was preparing such a post since the release of the first data of Canadian Census. As we're talking about their densities, here some data regarding Toronto, Montreal and Vancouver, and comparing them with their US peers:
Toronto
------------------- 2021 -------- 2011 -------- 2001 ------ Area ------- Density ---------- Growth %
TORONTO* -------- 5,246,184 --- 4,810,485 --- 4,087,252 -- 1,915 km² --- 2,739 inh./km² --- 9.1% -- 17.7%
LOS ANGELES* ---- 7,785,445 --- 7,650,536 --- 7,508,198 -- 2,461 km² --- 3,163 inh./km² --- 1.8% --- 1.9%
COOK COUNTY ----- 5,275,541 --- 5,194,675 --- 5,376,741 -- 2,447 km² --- 2,156 inh./km² --- 1.6% -- -3.4%
MIAMI-FT.LAUD.* - 4,624,381 --- 4,226,040 --- 3,862,744 -- 2,357 km² --- 1,962 inh./km² --- 9.4% --- 9.4%
BOSTON* --------- 3,457,094 --- 3,164,188 --- 3,071,003 -- 2,435 km² --- 1,420 inh./km² --- 9.3% --- 3.0%
DETROIT* -------- 2,542,281 --- 2,562,151 --- 2,867,451 -- 1,720 km² --- 1,478 inh./km² -- -0.8% - -10.6%
DALLAS COUNTY* -- 2,600,990 --- 2,357,605 --- 2,209,435 -- 2,062 km² --- 1,261 inh./km² -- 10.3% --- 6.7%
*Toronto, Mississauga, Markham, Richmond Hill, Vaughan, Brampton, Oakville
*Los Angeles and countless municipalities in LA County
*Miami-Dade (-5), Broward (-1)
*Boston and countless municipalities in MA
*Wayne, Oakland, Macomb core communities
*Dallas (-2)
------------------- 2021 -------- 2011 ------- 2001 ------- Area ------- Density ---------- Growth %
TORONTO --------- 2,794,356 --- 2,615,060 --- 2,481,494 ---- 630 km² --- 4,434 inh./km² --- 6.9% --- 5.4%
CHICAGO* -------- 3,021,599 --- 2,962,926 --- 3,162,776 ---- 647 km² --- 4,670 inh./km² --- 2.0% -- -6.3%
PHILADELPHIA* --- 2,296,360 --- 2,201,510 --- 2,200,199 ---- 709 km² --- 3,241 inh./km² --- 4.3% --- 0.1%
BOSTON* --------- 1,955,679 --- 1,782,528 --- 1,727,200 ---- 634 km² --- 3,084 inh./km² --- 9.7% --- 3.2%
DETROIT* -------- 1,105,598 --- 1,162,077 --- 1,420,108 ---- 614 km² --- 1,801 inh./km² -- -4.9% - -18.2%
*Chicago, Evanston, Oak Park, Cicero, Berwyn
*Philadelphia, Delaware (+25), Montgomery (+7), Camden (+12)
*Boston and countless municipalities in MA
*Wayne core communities
Montreal
------------------- 2021 -------- 2011 -------- 2001 ------ Area ------- Density ---------- Growth %
MONTREAL* ------- 3,027,827 --- 2,826,740 --- 2,645,268 -- 1,142 km² --- 2,651 inh./km² --- 7.1% --- 6.9%
SAN FRANCISCO* -- 3,536,139 --- 3,259,013 --- 3,164,122 -- 1,583 km² --- 2,234 inh./km² --- 8.5% --- 3.0%
MIAMI* ---------- 2,680,009 --- 2,477,994 --- 2,239,726 -- 1,310 km² --- 2,046 inh./km² --- 8.2% -- 10.6%
BOSTON* --------- 2,634,219 --- 2,414,263 --- 2,341,713 -- 1,489 km² --- 1,769 inh./km² --- 9.1% --- 3.1%
SAN DIEGO* ------ 2,213,504 --- 2,075,560 --- 1,909,810 -- 1,336 km² --- 1,657 inh./km² --- 6.6% --- 8.7%
CUYAHOGA COUNTY - 1,264,817 --- 1,280,122 --- 1,393,978 -- 1,184 km² --- 1,068 inh./km² -- -1.2% -- -8.2%
*Montréal, Laval, Longueuil, Thérèse-De Blainville (-1)
*Alameda (+16), Contra Costa (+15), Marin (+20), San Francisco, San Mateo (+24)
*Miami-Dade (-5)
*Boston and countless municipalities in MA
*San Diego core municipalities
------------------- 2021 -------- 2011 -------- 2001 ------ Area ------- Density ---------- Growth %
MONTREAL -------- 2,004,265 --- 1,886,481 --- 1,812,723 ---- 499 km² --- 4,014 inh./km² --- 6.2% --- 4.1%
PHILADELPHIA* --- 1,882,328 --- 1,795,229 --- 1,787,586 ---- 462 km² --- 4,074 inh./km² --- 4.9% --- 0.4%
WASHINGTON* ----- 1,450,767 --- 1,277,768 --- 1,201,876 ---- 382 km² --- 3,802 inh./km² -- 13.5% --- 6.3%
BALTIMORE* -------- 991,049 --- 1,002,517 --- 1,020,376 ---- 470 km² --- 2,111 inh./km² -- -1.1% -- -1.8%
MINNEAPOLIS* ------ 801,045 ----- 719,183 ----- 708,980 ---- 411 km² --- 1,949 inh./km² -- 11.4% --- 1.4%
ATLANTA* ---------- 665,487 ----- 575,030 ----- 568,065 ---- 463 km² --- 1,423 inh./km² -- 15.7% --- 1.2%
TAMPA* ------------ 558,447 ----- 491,136 ----- 444,794 ---- 384 km² --- 1,453 inh./km² -- 13.7% -- 10.4%
*Philadelphia, Delaware (+14), Montgomery (+4)
*Washington and core municipalities in MD and VA
*Baltimore core
*Hennepin core municipalities
*Atlanta, Brookhaven, North Druid Hills, Druid Hills, North Decatur, Decatur, East Point
*Tampa, Egypt Lake-Leto, Town 'n' Country, University
Vancouver
------------------- 2021 -------- 2011 -------- 2001 ------ Area ------- Density ---------- Growth %
VANCOUVER* ------ 1,200,226 --- 1,083,169 ----- 958,515 ---- 351 km² --- 3,424 inh./km² -- 10.8% -- 13.0%
SEATTLE* ---------- 946,987 ----- 797,287 ----- 746,574 ---- 339 km² --- 2,793 inh./km² -- 18.8% --- 6.8%
PORTLAND ---------- 652,503 ----- 583,810 ----- 529,122 ---- 346 km² --- 1,888 inh./km² -- 11.8% -- 10.3%
CLEVELAND* -------- 602,284 ----- 629,606 ----- 733,670 ---- 325 km² --- 1,851 inh./km² -- -4.3% - -14.2%
PITTSBURGH* ------- 578,406 ----- 575,966 ----- 621,131 ---- 320 km² --- 1,807 inh./km² --- 0.4% -- -7.3%
ATLANTA ----------- 498,715 ----- 427,042 ----- 418,371 ---- 351 km² --- 1,423 inh./km² -- 16.8% --- 2.1%
*Vancouver, Burnaby, New Westminster, Richmond
*Seattle, Shoreline, Lake Forest Park, Mercer Island, White Center, Boulevard Park, Burien, Tukwila, Bryn Mawr-Skyway
*Cuyahoga core municipalities
*Allegheny core municipalities
------------------- 2021 -------- 2011 -------- 2001 ------ Area ------- Density ---------- Growth %
VANCOUVER* -------- 990,289 ----- 892,696 ----- 794,281 ---- 221 km² --- 4,477 inh./km² -- 10.9% -- 12.4%
MIAMI* ------------ 739,508 ----- 688,284 ----- 645,129 ---- 203 km² --- 3,643 inh./km² --- 7.4% --- 6.7%
SEATTLE ----------- 737,015 ----- 608,660 ----- 563,204 ---- 217 km² --- 3,395 inh./km² -- 21.1% --- 8.1%
BALTIMORE --------- 585,708 ----- 620,961 ----- 651,154 ---- 210 km² --- 2,794 inh./km² -- -5.7% -- -4.6%
CLEVELAND* -------- 424,996 ----- 450,196 ----- 535,565 ---- 218 km² --- 1,949 inh./km² -- -5.6% - -15.9%
CINCINNATI -------- 309,317 ----- 297,098 ----- 330,796 ---- 202 km² --- 1,534 inh./km² --- 4.1% - -10.2%
*Vancouver, Burnaby, New Westminster
*Miami-Dade core municipalities
*Cleveland, Bratenahl, Lakewood
------------------- 2021 -------- 2011 -------- 2001 ------ Area ------- Density ---------- Growth %
VANCOUVER --------- 662,248 ----- 603,502 ----- 545,671 ---- 115 km² --- 5,759 inh./km² --- 9.7% -- 10.6%
SAN FRANCISCO ----- 873,965 ----- 805,235 ----- 776,733 ---- 122 km² --- 7,193 inh./km² --- 8.5% --- 3.7%
BOSTON ------------ 676,216 ----- 617,779 ----- 590,355 ---- 125 km² --- 5,401 inh./km² --- 9.5% --- 4.6%
MIAMI* ------------ 533,851 ----- 494,153 ----- 456,944 ---- 115 km² --- 4,654 inh./km² --- 8.0% --- 8.1%
INDIANAPOLIS* ----- 153,549 ----- 142,516 ----- 166,651 ---- 109 km² --- 1,413 inh./km² --- 7.7% - -14.5%
*Miami, Miami Beach, Fisher Island, North Bay Village
*Indianapolis Center
In short, we can see how Canadian areas are denser than US ones, even compared to much bigger US metro areas.