Cosmos Township was first settled by Daniel Jackman, from Maine, in 1867. On his arrival, until he could build his house, he lived in a tent and cooked on an open fire. He took up a homestead in section 26. He returned to Minneapolis the following spring, but immediately returned and built his home in the summer of 1868. In 1877, he made a trip to the Black Hills and spent the season in gold mining, but returned in the fall. When the township was organized, the first election was held at his house. He was elected the first chairman of the board of supervisors and held that office for three years.
Every edition of the U.S. Geological Survey’s map of Cosmos Township. Tap a year, or press play to watch the town change.
1967Cosmos sheet · 1:24,000
U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Cosmos Township.
People over time
Cosmos Township, census by census
Between 230 and 610 people in every census since 1930.
10 censuses, 1930–2020.
U.S. Census Bureau decennial counts, from the census table on Cosmos Township’s Wikipedia page.
Famous people
Famous people close to Cosmos Township
Nobody well known was born in Cosmos Township itself, so here are the best known from just nearby.
Founding dates: Wikidata, Wikipedia, the U.S. post office records of Blevins & Helbock (CC0) and the Census. Homes by year built: Census ACS 2020–24. National Register of Historic Places: National Park Service (list of May 22, 2026). Old photos, postcards and papers: Wikimedia Commons, the Library of Congress and other public archives, credited on each item’s page. Maps: U.S. Geological Survey historical topographic maps (via Esri) and Sanborn fire-insurance maps (Library of Congress). History text and census tables: Wikipedia (CC BY-SA 4.0). Places that used to be: USGS Geographic Names Information System (2021). How TownRatings grades history →
From Wikimedia Commons (10), Wikipedia, U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia) and the USGS Geographic Names Information System. Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.