Lake Louise State Park is in southeastern Mower County, near Le Roy.

In 1852, Jacob McQuillin's family settled in southern Rice County, beginning a settlement movement that rapidly grew.

[4] The new county was named for John Edward Mower, a member of the territorial legislature.

[5] On March 1, 1856, Territorial Governor Willis A. Gorman signed the legislative act that organized the county.

In January 1857 those commissioners designated the permanent seat in Austin Township.

The county terrain consists of low rolling hills, etched with drainages and gullies.

[8] The terrain slopes to the east and south from an elevated center ridge running west–east,[9] with its highest point 1.6 miles (2.6 km) east of Elkton, at 1,440 ft (440 m) ASL.

It flows through Mower County's four westernmost townships: Udolpho, Lansing, Austin, and Lyle.

Source:[8] The county population has declined since its peak in 1960, as younger people have moved to urban areas for economic opportunities.

29.10% of all households were made up of individuals, and 14.80% had someone living alone who was 65 years of age or older.

In 2016, Donald Trump became the first Republican to carry the county since 1960, winning a high plurality of 49.8%.