9. Connecticut
While Connecticut may be pretty happy, the state’s income tax rate and property tax rate are both second highest in the country, according to the Tax Foundation.
Connecticut is also an expensive place to live. In Stamford, for instance, the average home costs $626,189, double the national average of $312,874. If you want to start your day with coffee, be prepared to pay 23 percent more than the U.S. average. Car trips will also cost more: A gallon of gas runs $2.47—around 4 percent higher than average.