The Baltic post office opened in 1889, the earliest record of the town by name. Two smaller post offices, Saint Olaf (1872) and Keys (1887), opened inside today’s city and later closed.
2020 census: 1,246137 years
How historic is Baltic?
C−
More historic than 20% of U.S. towns, on its age, its old homes and the National Register.
Founding year: the first Baltic post office (Blevins & Helbock, CC0).The full story ↓
History grade
What drives Baltic’s History grade
On its age, its old homes and the National Register, Baltic is more historic than 20% of U.S. towns. Its age holds the grade up; its National Register listings pull it down.
C−
HistoryA character grade: shown, never part of Baltic’s overall grade.
South Dakota towns list more on the Register than most of the country (a typical South Dakota town has 37.3 per 10,000 residents, the U.S. 2.4), so Baltic’s 0.0 sits below most of its state (15% of South Dakota towns have fewer) while its 0 listings outnumber those of 23% of U.S. towns.
How sure. Graded on any two of the three inputs instead, the letter would range from D to C. The pre-1940 share (±2.7 points) is firm at this size. The founding year is the first post office, not a stated founding date.
Founding year: the first post office (other dates in Quick answers). Homes: Census ACS 2020–24. National Register: National Park Service, May 2026 list; each listing counted once (boundary changes and added documentation belong to their listing), and a historic district counts its contributing buildings. How TownRatings grades history →
What stands out about Baltic’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
Baltic was originally called St. Olaf, and under the latter name was laid out in 1881. Another variant name was Keyes. A post office was established under the name Saint Olaf in 1872, the name was changed to Keyes in 1887, and the name was again changed to Baltic in 1889. The Chicago, Milwaukee, Saint Paul and Pacific Railroad built through Baltic and established a railroad depot.
Passages that mention Baltic, cut from the printed page as they were published.
History of Minnehaha county, South Dakota. Containing an account of its settlements, growth, development and resources ... Synopsis of public records, biographical sketches ..1899 · page 919Read the page →
Read the text
Paul railroad runs throug-h the entire leng-th of Sverdrup, but its nearest station is at Baltic, formerly known as St. Olaf and Keyes, located on the southeast quarter of section 32, in Dell Rapids township. It has more resident farmers than any other township in the county, and its valuation of personal property is the largest, except Sioux Falls and Dell Rapids with the cities included. The population is principally of Scandinavian descent; and the well cultivated farms, fine building-s and other evidence of thrift that can be seen in
Text read by machine from the scan; it may contain errors.
History of Minnehaha county, South Dakota. Containing an account of its settlements, growth, development and resources ... Synopsis of public records, biographical sketches ..1899 · page 1091Read the page →
Read the text
line dividingthe townships. On the Sverdrup side there are two elevators, three g-eneral stores, two blacksmith shops, harness shoj), and lumber yard. There is also a good school house, a creamery, and hotel at this point. Baltic is a gfood wheat market, and has some very energ-etic, g-ood business men eng-ag-ed in business there. Amongthem are John (). Lang-ness, T. J. and Knut Ouestad, T. T.
Text read by machine from the scan; it may contain errors.
Scans and text from the Internet Archive. Books published in 1930 or earlier, which are in the public domain.
Timeline
Baltic, 1872 to 1913
Woven from the archive, old maps, post office records, the National Register and the people born here.
The Baltic post office opened in 1889, the earliest record of the town by name (U.S. post office records).
How does Baltic rank for history?
Baltic is more historic than 20% of U.S. towns. The History grade combines the town’s founding era, the share of homes built before 1940 and its National Register listings. It’s a character grade, so it isn’t part of the overall grade. How it works.
How old are the homes in Baltic?
6% of Baltic’s homes were built before 1940 (Census estimate, ±2.7 points), against a typical 10% for a South Dakota town; the median home was built in 1997.
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).
From Wikimedia Commons (2), Wikipedia, Wikidata and Wikipedia for famous people, the US Post Offices dataset (Blevins & Helbock), the USGS Geographic Names Information System and old county and town histories (Internet Archive). Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.
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