The population of Seneca county is estimated at 55,357. In 2017 there were 582 births and 556 deaths in Seneca county. Seneca county has 9,939 housing units that are owned with a mortgage or a loan, 6,115 that are owned free and clear and 5,720 that are renter occupied.

  The upstanding residents of Seneca County filed 26,570 federal tax returns in 2017. This amount represents 0.5% of all Ohio filings and 0.018% of the entire nation. Seneca had a combined total federal tax liability of $169,132,000 on earned income of $1,215,964,000. Other notable statistics from Seneca County were 920 unemployment claims which collected a total of $3,502,000 and 2,570 charitable contributions valued at $11,168,000. 3,110 filings from Seneca County paid a combined total of $6,756,000 in property taxes and 2,560 filings paid $12,781,000 on mortgage interest costs.

  In 2010 Seneca county had 84 religious congregations with an estimated 30,756 members.
15.3% of the Seneca population has a college level Bachelors degree or higher. 9.2% have less than a highschool diploma level education.

Approximately 42% of Seneca County voted in the presidential election of 2016. This represents a decrease from the 2012 election by 1,152 votes.
At $47,805 the median income is 88.4% of the Ohio average. An estimated 1,303 people claimed to be unemployed last year in Seneca, the equivalant of around 4.8% of the county population. This represents a decrease in the level of unemployment from the previous year's value of 4.9%.

Top 15 Industries in Seneca County.
Total # Employed	Industry Job Type
3,498	Manufacturing
2,536	Health care and social assistance
2,064	Retail trade
1,481	Accommodation and food services
1,378	Nursing and residential care facilities
1,353	Food services and drinking places
1,201	Restaurants and other eating places
821	Administrative and support and waste management and remediation services
783	Machinery manufacturing
686	Continuing care retirement communities and assisted living facilities for the elderly
673	Administrative and support services
646	Wholesale trade
623	Transportation equipment manufacturing
581	Transportation and warehousing
581	Full-service restaurants

In 2018 the average price reduction was 6.19% in Seneca County.

In 2018 9.78% of listings in Seneca County.

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