Lincoln may be the happiest place in the United States.

The capital city of Nebraska topped 188 other metropolitan areas in the 2012 Gallup-Healthways Well-Being Index.

The survey index is calculated from scores in six measures of well-being. Gallup surveyed nearly 354,000 respondents ages 18 and older.

Lincoln jumped from 118th in 2011 to first last year in the work environment category.

Nebraska came in at No. 7 among the states, one spot higher than in 2011. Omaha came in at 27th in the metropolitan category.