Lyman County, South Dakota

Lyman County population, land area and income

Lyman County had 3,721 residents in the Census Vintage 2024 estimate, on 1,642.3 square miles of land. It ranks 43rd of 66 in South Dakota by population and 14th by land area. That works out to 2.3 people per square mile, below the US average of 96.3, and in the bottom quarter nationally.

The median county-equivalent in South Dakota has 5,296 residents; Lyman County is somewhat smaller.

Its SAIPE 2023 median household income of $55,274 is below the national county median among 3,143 counties with an estimate.

How Lyman County's population changed since 2020

Lyman County gained 20 residents between the July 2020 and July 2024 estimates, a rise of 0.5%. That ranks 35th of 66 in South Dakota for growth. The median South Dakota county changed by +0.8%, and the state as a whole by +4.1%.

Since the April 2020 estimates base, Lyman County recorded 288 births and 195 deaths, a natural change of +93. Net international migration added +21 and net domestic migration, people moving to or from other US counties, came to -110. The largest single component was domestic migration, which removed 110 people.

Where Lyman County is

The Census internal point of Lyman County is at 43.894800, -99.841900. It sits in UTM zone 14N. The map shades South Dakota's 66 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Lyman County outlined. Dots are towns of 1,000+ people with residents in it.

Towns in Lyman County

No incorporated place of 1,000 or more people has residents in Lyman County. Its 3,721 residents live in smaller towns, census-designated places, or unincorporated land, which the subcounty estimates do not list at this size.

Counties bordering Lyman County

The Census 2024 county adjacency file lists 10 neighbors for Lyman County. The most populous is Hughes County, SD, with 17,526 residents. Distances run between Census internal points in a straight line.

• Hughes County

  17,526 people

  34 mi N

• Charles Mix County

  9,343 people

  78 mi SE

• Tripp County

  5,717 people

  38 mi S

• Brule County

  5,261 people

  39 mi ESE

• Gregory County

  4,110 people

  59 mi SSE

• Stanley County

  3,015 people

  57 mi NW

• Mellette County

  1,834 people

  50 mi WSW

• Buffalo County

  1,825 people

  33 mi ENE

• Hyde County

  1,215 people

  48 mi NNE

• Jones County

  874 people

  42 mi W

Distance to Pierre and the nearest big city

Pierre is 41.1 miles NW of Lyman County's internal point in a straight line. The nearest place of 100,000 or more is Sioux Falls, SD (population 209,289), 157.2 miles away. The nearest place of 10,000 or more is Pierre, SD (population 13,788), 40.8 miles away.

Lyman County FIPS code

The FIPS code of Lyman County is 46085: state code 46 for South Dakota plus county code 085. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $55,274.