This chart show the population of Mexico City, São Paulo, and Buenos Aires from 1950 to 2020.
| Year | Mexico City | São Paulo | Buenos Aires |
| 1950 | 3365000 | 2334000 | 5166000 |
| 1951 | 3533000 | 2461000 | 5307000 |
| 1952 | 3710000 | 2596000 | 5452000 |
| 1953 | 3895000 | 2737000 | 5601000 |
| 1954 | 4090000 | 2886000 | 5753000 |
| 1955 | 4294000 | 3044000 | 5910000 |
| 1956 | 4509000 | 3210000 | 6072000 |
| 1957 | 4734000 | 3385000 | 6237000 |
| 1958 | 4970000 | 3570000 | 6407000 |
| 1959 | 5218000 | 3764000 | 6582000 |
| 1960 | 5479000 | 3970000 | 6762000 |
| 1961 | 5749000 | 4229000 | 6919000 |
| 1962 | 6032000 | 4515000 | 7071000 |
| 1963 | 6330000 | 4820000 | 7227000 |
| 1964 | 6642000 | 5147000 | 7386000 |
| 1965 | 6969000 | 5494000 | 7549000 |
| 1966 | 7313000 | 5866000 | 7715000 |
| 1967 | 7673000 | 6262000 | 7884000 |
| 1968 | 8052000 | 6686000 | 8058000 |
| 1969 | 8448000 | 7138000 | 8235000 |
| 1970 | 8831000 | 7620000 | 8416000 |
| 1971 | 9182000 | 8004000 | 8566000 |
| 1972 | 9548000 | 8380000 | 8707000 |
| 1973 | 9928000 | 8772000 | 8850000 |
| 1974 | 10323000 | 9184000 | 8995000 |
| 1975 | 10734000 | 9614000 | 9143000 |
| 1976 | 11162000 | 10065000 | 9294000 |
| 1977 | 11605000 | 10536000 | 9446000 |
| 1978 | 12067000 | 11030000 | 9601000 |
| 1979 | 12547000 | 11547000 | 9759000 |
| 1980 | 13028000 | 12089000 | 9920000 |
| 1981 | 13268000 | 12384000 | 10049000 |
| 1982 | 13514000 | 12629000 | 10166000 |
| 1983 | 13764000 | 12879000 | 10284000 |
| 1984 | 14019000 | 13135000 | 10403000 |
| 1985 | 14278000 | 13395000 | 10523000 |
| 1986 | 14542000 | 13660000 | 10645000 |
| 1987 | 14812000 | 13931000 | 10769000 |
| 1988 | 15086000 | 14208000 | 10894000 |
| 1989 | 15365000 | 14489000 | 11020000 |
| 1990 | 15642000 | 14776000 | 11148000 |
| 1991 | 15908000 | 15069000 | 11277000 |
| 1992 | 16179000 | 15288000 | 11407000 |
| 1993 | 16453000 | 15494000 | 11539000 |
| 1994 | 16733000 | 15702000 | 11672000 |
| 1995 | 17017000 | 15913000 | 11806000 |
| 1996 | 17307000 | 16128000 | 11943000 |
| 1997 | 17601000 | 16345000 | 12081000 |
| 1998 | 17900000 | 16545000 | 12220000 |
| 1999 | 18204000 | 16788000 | 12361000 |
| 2000 | 18457000 | 17014000 | 12504000 |
| 2001 | 18618000 | 17260000 | 12648000 |
| 2002 | 18780000 | 17512000 | 12808000 |
| 2003 | 18944000 | 17767000 | 12980000 |
| 2004 | 19110000 | 18026000 | 13154000 |
| 2005 | 19276000 | 18288000 | 13330000 |
| 2006 | 19444000 | 18555000 | 13508000 |
| 2007 | 19614000 | 18825000 | 13689000 |
| 2008 | 19785000 | 19100000 | 13872000 |
| 2009 | 19958000 | 19377000 | 14058000 |
| 2010 | 20137000 | 19660000 | 14246000 |
| 2011 | 20372000 | 19902000 | 14364000 |
| 2012 | 20610000 | 20143000 | 14449000 |
| 2013 | 20850000 | 20387000 | 14534000 |
| 2014 | 21094000 | 20633000 | 14620000 |
| 2015 | 21340000 | 20883000 | 14706000 |
| 2016 | 21420000 | 21136000 | 14792000 |
| 2017 | 21500000 | 21392000 | 14879000 |
| 2018 | 21581000 | 21650000 | 14967000 |
| 2019 | 21672000 | 21847000 | 15057000 |
| 2020 | 21782000 | 22043000 | 15154000 |