Population within various radiuses of downtowns

EDIT: I organized the data by radius to make it easier to compare the cities. 5 mile radius ---------------------- Los Angeles (2075, LA county) Population: 1182577 Land Area: 76.4798 sq miles Population Density: 15462.6 people / sq mile San Francisco (117, SF county) Population: 587261 Land Area: 34.4644 sq miles Population Density: 17039.7 people / sq mile Chicago (3203, Cook county) Population: 770384 Land Area: 46.8594 sq miles Population Density: 16440.3 people / sq mile Boston (303, Suffolk county) Population: 827294 Land Area: 56.859 sq miles Population Density: 14549.9 people / sq mile New York (13, NY county) Population: 1915593 Land Area: 54.8853 sq miles Population Density: 34901.8 people / sq mile Philadelphia (5, Philadelphia county) Population: 886440 Land Area: 69.7783 sq miles Population Density: 12703.7 people / sq mile 10 mile radius ---------------------- Los Angeles (2075, LA county) Population: 3449763 Land Area: 315.917 sq miles Population Density: 10919.9 people / sq mile San Francisco (117, SF county) Population: 1396349 Land Area: 140.858 sq miles Population Density: 9913.14 people / sq mile Chicago (3203, Cook county) Population: 2686858 Land Area: 177.305 sq miles Population Density: 15153.9 people / sq mile Boston (303, Suffolk county) Population: 1661597 Land Area: 222.519 sq miles Population Density: 7467.23 people / sq mile New York (13, NY county) Population: 6391931 Land Area: 258.322 sq miles Population Density: 24744 people / sq mile Philadelphia (5, Philadelphia county) Population: 2132736 Land Area: 288.156 sq miles Population Density: 7401.32 people / sq mile 15 mile radius ---------------------- Los Angeles (2075, LA county) Population: 5829483 Land Area: 729.043 sq miles Population Density: 7996.08 people / sq mile San Francisco (117, SF county) Population: 2069126 Land Area: 332.055 sq miles Population Density: 6231.27 people / sq mile Chicago (3203, Cook county) Population: 3873802 Land Area: 385.062 sq miles Population Density: 10060.2 people / sq mile Boston (303, Suffolk county) Population: 2244433 Land Area: 530.564 sq miles Population Density: 4230.27 people / sq mile New York (13, NY county) Population: 10032731 Land Area: 534.633 sq miles Population Density: 18765.6 people / sq mile Philadelphia (5, Philadelphia county) Population: 3031811 Land Area: 652.528 sq miles Population Density: 4646.26 people / sq mile 20 mile radius ---------------------- Los Angeles (2075, LA county) Population: 7840178 Land Area: 1053.18 sq miles Population Density: 7444.27 people / sq mile San Francisco (117, SF county) Population: 2632924 Land Area: 671.937 sq miles Population Density: 3918.41 people / sq mile Chicago (3203, Cook county) Population: 4770488 Land Area: 688.492 sq miles Population Density: 6928.9 people / sq mile Boston (303, Suffolk county) Population: 2780497 Land Area: 941.3 sq miles Population Density: 2953.89 people / sq mile New York (13, NY county) Population: 12019933 Land Area: 913.364 sq miles Population Density: 13160.1 people / sq mile Philadelphia (5, Philadelphia county) Population: 3849296 Land Area: 1240.42 sq miles Population Density: 3103.21 people / sq mile 30 mile radius ---------------------- Los Angeles (2075, LA county) Population: 10591874 Land Area: 2392.55 sq miles Population Density: 4427.02 people / sq mile San Francisco (117, SF county) Population: 3964487 Land Area: 1654.86 sq miles Population Density: 2395.67 people / sq mile Chicago (3203, Cook county) Population: 6879365 Land Area: 1588.24 sq miles Population Density: 4331.43 people / sq mile Boston (303, Suffolk county) Population: 3909385 Land Area: 2067.73 sq miles Population Density: 1890.67 people / sq mile New York (13, NY county) Population: 14820904 Land Area: 2060.41 sq miles Population Density: 7193.18 people / sq mile Philadelphia (5, Philadelphia county) Population: 5128965 Land Area: 2769.04 sq miles Population Density: 1852.26 people / sq mile 40 mile radius ---------------------- Los Angeles (2075, LA county) Population: 12488819 Land Area: 3667.76 sq miles Population Density: 3405.03 people / sq mile San Francisco (117, SF county) Population: 5130643 Land Area: 2998.5 sq miles Population Density: 1711.07 people / sq mile Chicago (3203, Cook county) Population: 8267630 Land Area: 2924.5 sq miles Population Density: 2827.03 people / sq mile Boston (303, Suffolk county) Population: 5129207 Land Area: 3573.87 sq miles Population Density: 1435.2 people / sq mile New York (13, NY county) Population: 16536460 Land Area: 3511.18 sq miles Population Density: 4709.66 people / sq mile Philadelphia (5, Philadelphia county) Population: 6125828 Land Area: 4954.42 sq miles Population Density: 1236.44 people / sq mile 50 mile radius ---------------------- Los Angeles (2075, LA county) Population: 13826349 Land Area: 5526.85 sq miles Population Density: 2501.67 people / sq mile San Francisco (117, SF county) Population: 6484900 Land Area: 4440.8 sq miles Population Density: 1460.3 people / sq mile Chicago (3203, Cook county) Population: 8855920 Land Area: 4911.24 sq miles Population Density: 1803.2 people / sq mile Boston (303, Suffolk county) Population: 6428517 Land Area: 5273.32 sq miles Population Density: 1219.06 people / sq mile New York (13, NY county) Population: 18125529 Land Area: 5484.53 sq miles Population Density: 3304.85 people / sq mile Philadelphia (5, Philadelphia county) Population: 7377175 Land Area: 7543.67 sq miles Population Density: 977.93 people / sq mile Source: factfinder.census.gov census tract data>