Data / Population / Seneca County

Population in Seneca County

Population in Seneca County was 54,522 in 2025, according to the U.S. Census Bureau. That is down 0.3% from 2024. That is the 47th highest of 88 counties in 2025.

2025, persons54,522
Change on 2024-0.3%
Rank47th of 88Counties in Ohio ranked
Series high55,0612020
Series low54,5222025

Population in Seneca County, 2020 to 2025

CSVChart (SVG)

54.4K54.6K54.8K55K55.2K2020202120222023202420252020: 55,061 persons2021: 54,975 persons2022: 54,650 persons2023: 54,719 persons2024: 54,694 persons2025: 54,522 persons
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08, published 2026-03-26.
All 6 values
Periodpersons
202554,522
202454,694
202354,719
202254,650
202154,975
202055,061

Compared with Ohio and United States

Place2025
Seneca County54,522
Ohio11,900,510
United States341,784,857

Rankings

Definition

Resident population. Spain and the EU: 1 January, with Spanish figures from the official municipal register (Padrón). United States: Census Bureau population estimates for 1 July. Other countries and the World: World Bank mid-year estimates, which count all residents regardless of legal status or citizenship.

For Denmark, Statistics Denmark counts the registered resident population on 1 January. Greenland and the Faroe Islands are excluded. The annual series selects the first-quarter reference date from FOLK1A. The World Bank series exists for every country, so use it (through compare) to rank countries on one basis.

How to cite

U.S. Census Bureau. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-08.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

What is the latest population in Seneca County? Cite the source.
get_value {"indicator":"population","place":"us-county-39147"}
GET https://invokely.ai/api/v1/value?indicator=population&place=us-county-39147

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

What is the population in Seneca County?

Population in Seneca County was 54,522 in 2025, according to the U.S. Census Bureau. That is down 0.3% from 2024. That is the 47th highest of 88 counties in 2025.

Where does this figure come from?

U.S. Census Bureau. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). Retrieved by Invokely on 2026-10-08.

What was the highest population in Seneca County?

55,061 in 2020, the highest value since 2020 in this series.

More statistics for Seneca County

All statistics for Seneca County