Guest, Sign inJoin

Post to Seneca

We’ll email a one-tap link to publish your post. No password, and nothing is public until you click it.
Already a member? Sign in
–Not graded
History · Seneca

Seneca’s post office opened in 1895, and 32% of its homes were built before 1940

Below: 12 old photos and papers, maps from 1961 on, and the census since 1980.

1895first post office
0on the National Register
32%homes built before 1940
12old photos & papers
Add an old photoShare a memory
From Seneca’s archive · credits on each photo
Quick answers

How Seneca began

When was Seneca founded?

1895

The Seneca post office opened in 1895, the earliest record of the town by name. Wikidata gives 1970.

First census: 285 in 19802020 census: 165131 years
Founding year: the first Seneca post office (Blevins & Helbock, CC0). Wikidata: 1970.The full story ↓

What stands out about Seneca’s past

Read from the archive, the National Register and the record. The page puts what stands out first.

A town in old photos12 old photos, postcards and papers.Old housesHalf of Seneca’s homes were built before 1947.
★ What stands out · By decade

Seneca, decade by decade

One decade in the archive so far: the 1940s. Scroll each row; tap a photo for its story.

1940s12 items
Seneca, Oregon. Sheepskins1942Seneca, Oregon. SheepskinsSeneca, Oregon. Samples of chrome ore1942Seneca, Oregon. Samples of chrome oreSeneca, Oregon. Loading cattle hides onto truck1942Seneca, Oregon. Loading cattle hides onto truckSeneca, Oregon. Loading chrome ore into freight car1942Seneca, Oregon. Loading chrome ore into freight carSeneca, Oregon. Loading chrome ore into freight car1942Seneca, Oregon. Loading chrome ore into freight carSeneca, Oregon. Ore purchasing depot of the metal reserve company1942Seneca, Oregon. Ore purchasing depot of the metal res…Seneca, Oregon. Agent of the metal reserves company samples specimens for assaying1942Seneca, Oregon. Agent of the metal reserves company s…Seneca, Oregon. Agent of the metal reserves company samples specimens for assaying1942Seneca, Oregon. Agent of the metal reserves company s…Seneca, Oregon. Agent of the metal reserves company samples specimens for assaying1942Seneca, Oregon. Agent of the metal reserves company s…Seneca, Oregon. Agent of the metal reserves company weighing in chrome ore at the ore purchasing depot1942Seneca, Oregon. Agent of the metal reserves company w…Seneca, Oregon. Piles of chrome ore on the lot of the ore purchasing depot of the metal reserves company1942Seneca, Oregon. Piles of chrome ore on the lot of the…Seneca, Oregon. Sign on the ore purchasing depot of the metal reserves company. This company buys ore from small operat…1942Seneca, Oregon. Sign on the ore purchasing depot of t…
1950s–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 album
The story

How Seneca came to be

From Wikipedia’s history of Seneca.

Read it all →

Seneca post office was established in 1895 and named by postmaster Minnie Southworth for her brother-in-law, prominent Portland judge Seneca Smith.

Text from Wikipedia, licensed CC BY-SA 4.0.

Timeline

Seneca, 1895 to 1961

Woven from the archive, old maps, post office records, the National Register and the people born here.

  1. 19th century
  2. 1895Post officeThe Seneca post office opens
  3. 20th century
  4. 1942In the archiveSeneca, Oregon. Sheepskins
  5. 1961On the mapFirst mapped by the U.S. Geological Survey
On the map

Seneca on the map, 1961 to 1990

Every edition of the U.S. Geological Survey’s map of Seneca. Tap a year, or press play to watch the town change.

Seneca on the 1961 USGS mapSeneca on the 1990 USGS map1961Seneca sheet · 1:62,500

U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Seneca.

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.

Seneca, Oregon. Sheepskins
Retake this viewSeneca, Oregon. Sheepskins, 1942

Find the spot, match the angle, and add your photo. It becomes the first then-and-now pair on Seneca’s page.

Retake this view · +15
People over time

Seneca, census by census

0100200300198020002020Peak: 285

Between 165 and 285 people in every census since 1980.

5 censuses, 1980–2020.

U.S. Census Bureau decennial counts, from the census table on Seneca’s Wikipedia page.

Famous people

Famous people close to Seneca

Nobody well known was born in Seneca itself, so here are the best known from just nearby.

See all →
Joseph PoindexterAmerican judge · b. 1869
LaVonne Griffin-ValadeAmerican politician · b. 1953
Places that used to be

Places now gone

Seneca’s post office has been open since 1895.

Gone or out of use
Seneca Emergency Airstripairport

US Post Offices dataset (Blevins & Helbock, CC0). Places and cemeteries from the USGS Geographic Names Information System (2021).

Help out

Finish Seneca’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.
Retake an old viewSeneca, Oregon. Sheepskins: stand where they stood+15Share a family photoSign in to add one+10

Questions about Seneca’s history

What year was Seneca founded?

The Seneca post office opened in 1895, the earliest record of the town by name (U.S. post office records). Wikidata gives 1970.

Memory lane

What the archives can’t tell you, neighbors can.

Town Square →
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 (12), 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.