Welcome to Seneca ...

The city of Seneca is located in Grant County<1>.

The location of Seneca has been provided by the Geographic Names Information System (ie- the GNIS).<2>

While we don't have a date for the founding of Seneca, you might consider that their post office opened  in 1895.

From the  Census Estimates for 2019, Seneca has a population of 225 people<3> (see below for details).

Seneca is 4,670 feet [1,423 m] above sea level.<4> In other words, the altitude of Seneca is about ¾ mile [or ~1½ km] above sea level.

Time Zone: Seneca lies in the Pacific Time Zone (PST/PDT) and observes daylight saving time

Note: If you travel east from Seneca, you will leave Pacific Time and cross into the Mountain Time Zone (MST/MDT).

Telephone area codes for Seneca: (541) and (458)<5>

Population Details ...

Taken from the 2019 Census Estimates, Seneca had an population of 225 people. This is an increase of 13.07% since the 2010 Census (or an increase of 0.9% since the 2000 Census).

At the time of the 2010 Census, Seneca had a population of 199 people. This makes Seneca the county's 5th most populous community.

With a 2010 count of 199 people, the population of Seneca decreased 10.76% from the 2000 Census (which had a count of 223 people).

More information can be found on the Census Page for Seneca.

Communities Also Named Seneca ...

Using our Gazetteer, we found that there are two Oregon communities named Seneca: This one is located in Grant County and the other is located in Lane County.

Beyond Oregon, there are 26 communities that are also named Seneca - they are located in Arizona, California, Florida (2), Illinois, Iowa, Kansas, Maryland, Michigan (2), Mississippi, Missouri, Nebraska, New Mexico, New York, Ohio (2), Ontario, Pennsylvania, South Carolina, South Dakota, Texas, Virginia, West Virginia and Wisconsin.

For more information, see our Tidbits & Trivia Page for Seneca.

Communities near Seneca ...

We have created a list of 4 communities that are near Seneca.

• John Day
  (19 miles [30.6 km] to the north)
  • Jump to our Gazetteer entry for John Day
  • John Day is located in Grant County
  • Population from the 2020 Census: 1,669 people
  • Jump to TripAdvisor's Tourism page for John Day <6>
• Canyon City
  (17 miles [27.4 km] to the north)
  • Note: The GPS coordinates that we are using for Canyon City have been provided by the GNIS.<2> The coordinates still need to be verified.
  • Jump to our Gazetteer entry for Canyon City
  • Canyon City is located in Grant County
  • Population from the 2020 Census: 659 people
  • Jump to TripAdvisor's Tourism page for Canyon City <6>
• Mount Vernon
  (20 miles [32.2 km] to the north)
  • Jump to our Gazetteer entry for Mount Vernon
  • Mount Vernon is located in Grant County
  • Population from the 2020 Census: 511 people
  • Jump to TripAdvisor's Tourism page for Mount Vernon <6>
• Prairie City
  (26 miles [41.8 km] to the northeast)
  • Note: The GPS coordinates that we are using for Prairie City have been provided by the GNIS.<2> The coordinates still need to be verified.
  • Jump to our Gazetteer entry for Prairie City
  • Prairie City is located in Grant County
  • Population from the 2020 Census: 872 people
  • Jump to TripAdvisor's Tourism page for Prairie City <6>

To Help With Your Genealogy Research ...

We have a couple of sections for those tracing their genealogy.

We created a list of cemeteries that are in the area around Seneca. Our list includes the location of those cemeteries and we provide an overhead view. See our Cemetery List for Seneca.

Using the information from an 1895 Atlas, we've created a list of communities that were in the area of Seneca. Our list includes information such as whether the 1895 community had a post office or railroad service. See our List of 1890's Communities around Seneca.

We also have a detailed list of newspapers that have been published in the area around Seneca. See our Newspapers Page for Seneca.

TripAdvisor Tourism Pages for Seneca ...

Looking for more information about Seneca? A wonderful source is the TripAdvisor website. We always start with the TripAdvisor Tourism page, where you can read an overview with links that will help you find lodging, restaurants and attractions.

In addition to the Tourism page for Seneca, there are neighboring communities that also have Tourism pages. More information about those communities can be found on our TripAdvisor Page for Seneca.

Adding Seneca to Our Gazetteer ...

We originally found mention of Seneca in both the FIPS-55 and the GNIS. For more information, see the FIPS and GNIS Codes sections on our Miscellaneous Page.

From our notes, the earliest published mention we've found for Seneca was in the document titled List of Post Offices from Cameron Blevins and Richard Helbock.<7>

From that list, the Seneca post office opened in 1895.

For more details, see References and Mentions for Seneca.

Off-the-Road Links ...

Unfortunately, we don't know of a website for Seneca. If you can help, please contact us through our Feedback Page.

The official website for State of Oregon: https://www.oregon.gov/