Cardiometabolic conditions, including hypertension, diabetes, and obesity are associated with adverse health outcomes, including increased rates of hospitalization and deaths in patients who are diagnosed with COVID-19. However, little to no evidence is known currently on the cardiometabolic conditions before and during the COVID-19 pandemic. This study utilizes a nationally representative sample of adults in the United States (U.S.) to estimate the prevalence of cardiometabolic conditions, focusing on diabetes, hypertension, and obesity, and determine their prevalence and absolute and relative rates before and during COVID-19 pandemic declaration. Furthermore, the study aims to determine the association between these cardiometabolic conditions and physical activity, tobacco use, anxiety/depression, and sociodemographic characteristics among U.S. adults during the COVID-19 pandemic. Data from the 2019 (N = 5359) and 2020 (N = 3830) Health Information National Trends Surveys (HINTS) on adults were utilized. Dependent variable was cardiometabolic conditions and the main explanatory variable was response before and during the COVID-19 pandemic. We conducted weighted descriptive and multivariable logistic regression controlling for confounders such as age, sex, and intensity of physical activity. While there was a slight increase in the prevalence of cardiometabolic conditions during the pandemic (56.09%) compared to before (54.96%), there was only a slight increase in the prevalence of diabetes (18.10% vs 17.28%) and obesity (34.68% vs 34.18%) and a slight decrease in the prevalence of hypertension (36.38% vs 36.36%). Results showed an increase in the prevalence of cardiometabolic conditions among former smokers (67.91% vs 63.86%), and current cigarette smokers (59.39% vs 55.43%), current e-cigarette users (37.24% vs 28.66%), individuals with mild (59.62% vs 55.43%), or moderate (61.98% vs 57.83%) anxiety/depression, sexual minority (53.50% vs 51.12%) and heterosexual (56.45% vs 54.96%) individuals during the pandemic, compared to before the pandemic. Additionally, people with mild anxiety/depression had higher odds of cardiometabolic conditions during the pandemic (AOR = 1.55, 95% CI = 1.01, 2.38), compared to before (AOR = 1.52, 95% CI =1.06, 2.19), relative to those without anxiety/depression. Similarly, former smokers had higher odds of cardiometabolic outcomes before and during the pandemic (AOR = 1.38, 95% CI = 1.01, 1.87 vs AOR = 1.57, 95% CI = 1.10, 2.25), when compared to never smokers. Odds were lower for current e-cigarette users (AOR = 0.44, 95% CI = 0.23, 0.85) compared to never e-cigarette users before the pandemic. There were no significant differences in odds of cardiometabolic conditions between sexual minorities and heterosexual individuals before and during the pandemic. In conclusion, increased risk for adverse cardiometabolic conditions was higher for individuals with cigarette use and mental health diagnoses during the COVID-19 pandemic, suggesting the critical need for smoking cessation and programs to support behavioral health.