Some characteristics of persons of voting age and persons who registered to vote are presented in this report. The data are based on a survey made in conjunction with the Current Population Survey (CPS) conducted by the Bureau of the Census in November 1966.1 Fifty-five percent of the civilian population of voting age, excluding persons residing in institutions, were reported as having voted in the 1966 congressional election. An additional 15 percent were registered to vote, but did not cast a ballot, and approximately 26 percent were not registered. For the remaining 3 percent the person's voting behavior was not reported or the respondent indicated that he did not know whether the person in question had voted or was registered. There was considerable variation by age, sex, color, region, residence, and a number of other social and economic characteristics. Detailed tables presenting the survey findings begin on page 10.