The story
Read it all →How Rock River came to be
From Wikipedia’s history of Rock River.
Rock River was founded in 1898 along the Union Pacific Railroad line.
Text from Wikipedia, licensed CC BY-SA 4.0.
–Not graded
History · Rock River
Rock River dates to 1898, and 40% of its homes were built before 1940
Its Register listing is the First National Bank of Rock River. Below: 3 old photos and papers, maps from 1955 on, and the census since 1910.
1898founded
1on the National Register
40%homes built before 1940
3old photos & papers
Quick answers
How Rock River began
When was Rock River founded?
1898
Rock River dates its founding to 1898 (Wikipedia’s history). The census first counted it in 1910.
First census: 123 in 19102020 census: 211128 years
Founding year: Wikipedia. First post office: 1900.The full story ↓
What stands out about Rock River’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
★ What stands out · Help out
Start Rock River’s collection
The first neighbors to add old photos shape how Rock River’s history is told.
Decades since 1900 with photos
00s10s20s30s40s50s60s70s80s90s
0 of 10 decades. The empty ones are waiting for someone’s album.People over time
Rock River, census by census
Peaked at 497 in 1960; 211 people lived here in 2020.
12 censuses, 1910–2020.
U.S. Census Bureau decennial counts, from the census table on Rock River’s Wikipedia page.
Timeline
Rock River, 1898 to 1960
Woven from the archive, old maps, post office records, the National Register and the people born here.
- 19th century
- 1898FoundingRock River is established
- 20th century
- 1900Post officeThe Rock River post office opens
- 1955
On the mapFirst mapped by the U.S. Geological Survey - 1960CensusPopulation peaks at 497
By decade
Rock River, decade by decade
Date?
Date?
Date?
2015On the map
Rock River on the map, 1955 to 1981
Every edition of the U.S. Geological Survey’s map of Rock River. Tap a year, or press play to watch the town change.
1955Rock River 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 Rock River.
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 viewRock River Union Pacific Snowshed Plant, .6 Mile North of Rock River
Find the spot, match the angle, and add your photo. It becomes the first then-and-now pair on Rock River’s page.
Retake this view · +15On the National Register
1 historic place in Rock River
The country’s official list of buildings and places worth saving.
place listed
1
National Historic Landmarks
0
none yet
historic buildings protected
1
each building in a district counts
first listed
1988
First National Bank of Rock River
Buildings
Architectural styles listings
Greek Revival1
National Park Service, National Register of Historic Places. Photos from Wikimedia Commons, credited on each place’s page.
Famous people
See all →Famous people close to Rock River
Nobody well known was born in Rock River itself, so here are the best known from just nearby.
Questions about Rock River’s history
What year was Rock River founded?
In 1898, according to Wikipedia’s history of the town. Rock River’s post office opened in 1900, and the census of 1910 counted 123 people here.
What is on the National Register in Rock River?
One place: the First National Bank of Rock River (listed 1988).
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). How TownRatings grades history →
From the Library of Congress (4), the National Register of Historic Places (1), Wikipedia, U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia), the US Post Offices dataset (Blevins & Helbock) 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.