As of the census[13] of 2000, 50,888 people, 20,496 households, and 14,121 families were living in the county.

The 28,222 housing units had an average density of 7 per square mile (2.7/km2).

As of  2010[update], 52,228 people, 21,927 households, and 14,353 families lived in the county.

[17] Somerset County is part of Maine's 2nd congressional district and represented by Democrat Jared Golden since 2019.

A "swing" or "pivot" county in the 21st century, despite voting for Democrat Barack Obama in the 2008 and 2012 presidential elections, Somerset County voted for Republican Donald Trump in 2016 and 2020, most recently by a margin of victory of 23.37%.

[18] In 2020, Trump became the first presidential candidate to carry the county with more than 60% of the vote since Ronald Reagan in 1984.

In 1992, the county was one of three in Maine to vote for independent Ross Perot, along with neighboring Piscataquis and Waldo.

The following school districts are located at least partly in Somerset County:[21]