
Thomas Barron House · National Register of Historic Places
Seneca’s story
199 years in pictures
Census counts: 4,802 in 1820, a peak of 9,188 in 1870, 2,658 in 2020. The archive holds 6 old photos and papers going back to 1880 and 3 maps from 1902 on.
4 places on the National Register of Historic Places.
Explore the history →
Getting set upMoving to Seneca: who provides what
Who provides power, water and the rest in Seneca, and how to reach them.
The full setup list →EPA SDWIS (Oct 9, 2026) · HIFLD + EIA-861 2025 · Census 2020 ZCTAs · NCES 2024–25 · registration: vote.gov, updated Aug 3, 2026.