Objective Learning to swim is recommended for children to prevent drowning and to promote lifelong physical activity. Dissimilar US youth swimming ability rates by demographics have been reported. Our research purpose was to examine youth swimming ability by selected variables, and to compare with similar research in 2010. Methods USA Swimming Foundation sponsored a cross-sectional study in 5 US cities during 2017. Trained YMCA personnel administered surveys measuring self-reported swimming ability among youth, ages 4-18 (N = 1373). We compared the 2017 results with findings from the 2010 study (N = 1741). Results In 2017, fewer respondents reported no/low swimming ability. However, groups were identified with a high percentage (greater than 50%) of no/low swimming ability including the following ones; girls, African-American boys and girls, and boys and girls who participate in free or reduced-cost lunch programs. Multivariate analysis showed that significant predictors for lower swimming ability were parent education (less than college education), qualifying for free or reduced-cost lunch programs, and being African-American. Conclusion No/low swimming ability groups were identified and continue to need support. Interventions should target children who are African-American, qualify for free or reduced-cost lunch, and have parents with lower levels of education.