The story
Read it all →How Denison came to be
From Wikipedia’s history of Denison.
Denison was laid out in 1856; the town was incorporated in 1875. Denison was named for its founder, J. W. Denison.
Text from Wikipedia, licensed CC BY-SA 4.0.
BHistory
History · Denison
Denison’s post office opened in 1856, and 17% of its homes were built before 1940
More historic than 59% of U.S. towns · #93 of 140 in Iowa. What drives it
7 places in town are on the National Register. Below: 5 old photos and papers, maps from 1886 on, and the census since 1870.
1856first post office
7on the National Register
17%homes built before 1940
5old photos & papers
13famous people
Quick answers
How Denison began
When was Denison founded?
1856
The Denison post office opened in 1856, the earliest record of the town by name.
First census: 326 in 18702020 census: 8,373170 years
How historic is Denison?
B
What drives the grade ↓More historic than 59% of U.S. towns, on its age, its old homes and the National Register.
Founding year: the first Denison post office (Blevins & Helbock, CC0).The full story ↓
History grade
What drives Denison’s History grade
On its age, its old homes and the National Register, Denison is more historic than 59% of U.S. towns, #93 of 140 in Iowa. Its share of homes from before 1940 holds the grade up; its age pulls it down.
B
HistoryA character grade: shown, never part of Denison’s overall grade.
Founding era1856, from the first post office: founded 1850–1899, an older era than 37% of U.S. townsC+Homes built before 194017.3% of homes (±5.3) · typical IA town 21.6% · U.S. 8.4%BNational Register7 listings, 8.5 per 10,000 residents · typical IA town 9.1 · U.S. 2.4B
All U.S. towns we grade (21,289)Ahead of 59%
NewerOlder
Iowa towns of 2,500+ (140)Ahead of 34%
Iowa towns list more on the Register than most of the country (a typical Iowa town has 9.1 per 10,000 residents, the U.S. 2.4), so Denison’s 8.5 sits near the middle of its state (55% of Iowa towns have fewer) while its 7 listings outnumber those of 73% of U.S. towns.
How sure. Graded on any two of the three inputs instead, the letter would range from B− to B+. The pre-1940 share is a Census survey estimate (±5.3 points). 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 Denison’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
★ What stands out · Every building
Denison, building by building, 1886–1913
Fire insurance maps drew every building, what it was made of and what it was used for, so insurers could price the risk of fire. Pick a year, then a sheet.
1886Sheet 1 of 2Sanborn Map Company, via the Library of Congress. Editions published in 1930 or earlier, which are in the public domain.
On the National Register
7 historic places in Denison
The country’s official list of buildings and places worth saving.
places listed
7
National Historic Landmarks
0
none yet
historic buildings protected
7
each building in a district counts
first listed
1976
William A. McHenry House
BuildingsStructures
Architectural styles listings
Queen Anne2
Beaux Arts1
Spanish Colonial Revival1
Bowstring Pony Arch-Truss1
William A. McHenry HouseQueen Anne
Clarence D. Chamberlin HouseBuilding
Crawford County CourthouseBeaux Arts
Park MotelSpanish Colonial Revival
Carey, John T. and Marietta (Greek) HouseQueen Anne
All 7 listings
National Park Service, National Register of Historic Places. Photos from Wikimedia Commons, credited on each place’s page.
Famous people
See all →13 famous people were born in Denison
Writers, athletes, leaders and more, ranked by how widely they’re known.
From the old history books
What they wrote about Denison in 1911
Passages that mention Denison, cut from the printed page as they were published.
History of Crawford County, Iowa, a record of settlement, organization, progress and achievement1911 · page 537Read the page →
Read the text
he matriculated in the law department of the State University at Iowa City. In 1904, having completed the full course, he was graduated with the degree of LL. B. He was admitted to the bar of Iowa soon after leaving the university, and in July, 1904, came to Denison and was identified with the firm of Shaw & Kuehnle, and with the Bank of Denison until October i, 1906. He then went to Charter Oak and took charge of Shaw & Kuehnle's office there for one year, at the end of which time he returned to Denison and entered into partnership with Parker W. Harding in the practice of law under the title of Harding & Kahler,
Text read by machine from the scan; it may contain errors.
History of Crawford County, Iowa, a record of settlement, organization, progress and achievement1911 · page 388Read the page →
Read the text
Mr. Hemminger remembers driving to Denison with eggs and butter when he received only three cents a dozen for eggs and three cents a pound for butter. He assisted in stacking liay on the ground where Manilla now stands the year before the town was founded and also assisted in hauling lumber for the first building in the new settlement. Having bravely borne his part of the burden, he now enjoys a well earned reward and also the respect of all who know him.
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
Denison, 1856 to 1971
Woven from the archive, old maps, post office records, the National Register and the people born here.
- 19th century
- 1856Post officeThe Denison post office opens
- 20th century
- 1921
Born hereDonna Reed is born here - 1921
Born hereJim Garrison is born here - 1930
Born hereChuck Darling is born here - 1936
In the archiveCigar store Indian - 1941
Born hereJames E. Hansen is born here - 1971
On the mapFirst mapped by the U.S. Geological Survey
By decade
Denison, decade by decade
One decade in the archive so far: the 1930s. Scroll each row; tap a photo for its story.
1930s5 items
1936
1936
1936
19361940s–1990snothing yet
Nothing in the archives for these yearsWeddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.
Add from your albumOn the map
Denison on the map, 1971 to 1985
Every edition of the U.S. Geological Survey’s map of Denison. Tap a year, or press play to watch the town change.
1971Denison sheet · 1:24,000U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Denison.
Then & now
Stand where they stood
No then-and-now pairs yet. Take a photo from the same spot as an old one and they appear here side by side.
Retake this viewCigar store Indian, 1936
Find the spot, match the angle, and add your photo. It becomes the first then-and-now pair on Denison’s page.
Retake this view · +15People over time
Denison, census by census
Grew from 326 people in 1870 to 8,373 in 2020, more than tenfold.
16 censuses, 1870–2020.
U.S. Census Bureau decennial counts, from the census table on Denison’s Wikipedia page.
Places that used to be
Old corners and burying grounds
Denison’s post office has been open since 1856.
Hamlets and corners on the map
Country View Mobile Home ParkSunset Village
1cemetery inside Denison
Saint Rose of Lima
US Post Offices dataset (Blevins & Helbock, CC0). Places and cemeteries from the USGS Geographic Names Information System (2021).
Help out
Finish Denison’s story
Most archives stop around 1920. The photos from after that are in family albums, not libraries.
Decades since 1900 with photos
00s10s20s30s40s50s60s70s80s90s
1 of 10 decades. The empty ones are waiting for someone’s album.Questions about Denison’s history
What year was Denison founded?
The Denison post office opened in 1856, the earliest record of the town by name (U.S. post office records).
How does Denison rank for history?
Denison is more historic than 59% of U.S. towns, #93 of 140 in Iowa. 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.
What is on the National Register in Denison?
7 listings: 6 buildings, among them the William A. McHenry House (listed 1976, the first), and 1 structure.
How old are the homes in Denison?
17% of Denison’s homes were built before 1940 (Census estimate, ±5.3 points), against a typical 22% for an Iowa town; the median home was built in 1974.
Memory lane
What the archives can’t tell you, neighbors can.
Start a conversation
Sources
Where this page comes from
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 the Library of Congress (5), the National Register of Historic Places (7), Wikipedia, Wikidata and Wikipedia for famous people, U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia), the US Post Offices dataset (Blevins & Helbock), the USGS Geographic Names Information System, Sanborn fire insurance maps (Library of Congress) 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.