[3] In 2009, the magazine ranked Sac County as the tenth "Best Place" in the Midwest Region.

[4] On January 13, 1846, the legislative body of the Iowa Territory authorized creation of twelve counties,[5] with general descriptions of their boundaries.

By the end of 1846, the territory had been accepted into the Union as the State of Iowa (December 28, 1846).

By 1851, the new state had grown to the extent that the original 22 counties needed to be divided into smaller, more accessible units.

By 1873 the burgeoning population had outgrown that structure[8] and a larger (85 x 56 feet brick) building was authorized to replace it.

The new courthouse, complete with impressive bell tower, was placed in service in January 1874, and was used until 1888 when it burned.

[21] Former school districts include:[22] Sac County is a rich area for geocaching.

The county was "put on the map" when geocachers hid a series of caches a mile wide and 8 miles high to spell "SAC" along rural roads between Sac City and Lytton in August 2011.

The population ranking of the following table is based on the 2020 census of Sac County.

Most of these in Democratic landslides, with 1988 being the notable big exception as Dukakis overperformed here, as he had almost everywhere else in Iowa, due to the farm crisis of the 1980s.