Reference 1: Population.
Reference 2: New York, California, Pennsylvania, Illinois, Ohio, Texas, Michigan, New Jersey, Massachusetts, Florida, Indiana, North Carolina, Missouri, Virginia, Wisconsin, Georgia, Tennessee, Minnesota, Alabama, Louisiana, Maryland, Kentucky, Washington, Iowa, Connecticut, South Carolina, Oklahoma, Mississippi, Kansas, West Virginia, Arkansas, Oregon, Colorado, Nebraska, Arizona, Maine, New Mexico, Utah, Rhode Island, District of Columbia, South Dakota, Montana, Idaho, Hawaii, North Dakota, New Hampshire, Delaware, Vermont, Wyoming, Nevada and Alaska.
Source: http://en.wikipedia.org/wiki/1960_United_States_Census
Reference 2: New York, California, Pennsylvania, Illinois, Ohio, Texas, Michigan, New Jersey, Massachusetts, Florida, Indiana, North Carolina, Missouri, Virginia, Wisconsin, Georgia, Tennessee, Minnesota, Alabama, Louisiana, Maryland, Kentucky, Washington, Iowa, Connecticut, South Carolina, Oklahoma, Mississippi, Kansas, West Virginia, Arkansas, Oregon, Colorado, Nebraska, Arizona, Maine, New Mexico, Utah, Rhode Island, District of Columbia, South Dakota, Montana, Idaho, Hawaii, North Dakota, New Hampshire, Delaware, Vermont, Wyoming, Nevada and Alaska.
Source: http://en.wikipedia.org/wiki/1960_United_States_Census
