It is 79 nautical miles (146 km) northeast of San Francisco, and is centered in the California Central Valley, one of the richest agricultural regions in the world.

The following table includes the number of incidents reported and the rate per 1,000 persons for each type of offense.

Yolo is a strongly Democratic county in presidential and congressional elections.

[17] In fact, since 1928, Eisenhower's win in 1952 was the only time the county was carried by the Republican presidential nominee.

In June 1978, Yolo was one of only three counties in the entire state to reject Proposition 13 (the others being San Francisco and Kern).

[24] In November 2008, Yolo was one of just three counties in California's interior in which voters rejected Proposition 8 to ban gay marriage.

[25] The 2010 United States census reported that Yolo County had a population of 200,849.

68.5% spoke English, 19.5% Spanish, 2.1% Chinese or Mandarin and 1.8% Russian as their first language.

23.3% of all households were made up of individuals, and 7.3% had someone living alone who was 65 years of age or older.

The population ranking of the following table is based on the 2010 census of Yolo County.