Call it the Bayou City Blues. A report from job website Lensa ranks Houston third among the U.S. cities with the unhappiest workers.

The report looks at four factors — vacation days taken, hours worked per week, average pay, and overall happiness — to determine the happiest and unhappiest cities for U.S. workers.

Lensa examined data for 30 major cities, including Dallas and San Antonio. Dallas appears at the top of the list of the cities with the unhappiest workers, and San Antonio lands at No. 8.

Minneapolis ranks first among the cities with the happiest workers.

Here's how Houston fared in the four ranking categories:

• 16.6 million unused vacation days per year.
• 40.1 average hours worked per week.
• Median annual pay of $32,251.
• Happiness score of out of 50.83.

Dallas had 19.4 million unused vacation days per year, 40.5 average hours worked per week, median annual pay of $34,479, and a happiness score of 53.3 out of 100.

Meanwhile, San Antonio had 5.7 million unused vacation days per year, 39.2 average hours worked per week, median annual pay of $25,894, and a happiness score of 48.61.

Texas tops Lensa's list of the states with the unhappiest workers.

"While the Lone Star State had a decent happiness score of 52.56 out of 100, it scored poorly on each of the other factors, with Texans allowing an incredible 67.1 million earned vacation days go to waste over the course of a year," Lensa says.

In terms of general happiness, Houston shows up at No. 123 on WalletHub's most recent list of the happiest U.S. cities. Dallas takes the No. 104 spot, and San Antonio lands at No. 141. Fremont, California, grabs the No. 1 ranking.