Rank	Aggolomeration	Population	Residential Sq. KM	Pop/Sq. KM	Residential Sq. Miles	Pop/Sq. Mi
1	Tokyo-Yokohama	27,245,000	2,819	9,664	1,089	25,018
2	Mexico City	20,899,000	1,351	15,465	522	40,036
3	Sao Paulo	18,701,000	1,168	16,017	451	41,466
4	Seoul	16,792,000	885	18,965	342	49,099
5	New York	14,625,000	3,298	4,434	1,274	11,480
6	Osaka-Kobe-Kyoto	13,872,000	1,281	10,825	495	28,024
7	Bombay	12,101,000	246	49,202	95	127,379
8	Calcutta	11,898,000	541	21,990	209	56,928
9	Rio de Janeiro	11,688,000	673	17,364	260	44,954
10	Buenos Aires	11,657,000	1,385	8,416	535	21,789
11	Moscow	10,446,000	981	10,646	379	27,562
12	Manila	10,156,000	487	20,867	188	54,021
13	Los Angeles	10,130,000	2,874	3,525	1,110	9,126
14	Cairo	10,099,000	269	37,509	104	97,106
15	Jakarta	9,882,000	197	50,225	76	130,026
16	Teheran	9,779,000	290	33,726	112	87,313
17	London	9,115,000	2,263	4,028	874	10,429
18	Delhi	8,778,000	357	24,570	138	63,609
19	Paris	8,720,000	1,118	7,797	432	20,185
20	Karachi	8,014,000	492	16,292	190	42,179