Ancestry-wise, 56.2% were of German, 8.7% Irish, 5.0% English, 4.2% Norwegian and 3.9% selected "United States or American" ancestry.

24.10% of all households were made up of individuals, and 10.80% had someone living alone who was 65 years of age or older.

It has voted Republican in every election in that span with the exception of the 1964 landslide victory of Democrat Lyndon B. Johnson.

In 2024, Donald Trump received over 65% of the vote in Dodge County, the best Republican performance since the 1956 landslide reelection of Dwight D. Eisenhower.

Historically, Dodge County had been a major stronghold of the Democratic Party in Wisconsin, from the establishment of the state, in 1848, until the 1910s, when a combination of World War I and the rise of the progressive faction of Republicans began to eat into the Democratic vote in the county.

A significant factor in the switch was the anti-war attitude among the county's large German American population.

Democratic president Woodrow Wilson and Wisconsin's Democratic U.S. senator Paul O. Husting (who was actually from Dodge County) supported the declaration of war against Germany in 1917, while progressive Republican leader Robert M. La Follette was one of only six senators who voted against the resolution.