The population of Gallia county is estimated at 29,996. In 2017 there were 363 births and 357 deaths in Gallia county. Gallia county has 4,527 housing units that are owned with a mortgage or a loan, 4,218 that are owned free and clear and 3,317 that are renter occupied.

  The residents of Gallia County filed 11,860 federal tax returns in 2017. This amount represents 0.2% of all Ohio filings and 0.008% of the entire nation. Gallia had a combined total federal tax liability of $81,308,000 on earned income of $558,155,000. Other notable statistics from Gallia County were 600 unemployment claims which collected a total of $2,981,000 and 1,140 charitable contributions valued at $5,848,000. 1,380 filings from Gallia County paid a combined total of $3,309,000 in property taxes and 1,120 filings paid $6,448,000 on mortgage interest costs.

  In 2010 Gallia county had 66 religious congregations with an estimated 8,418 members.
16.2% of the Gallia population has a college level Bachelors degree or higher. 19.0% have less than a highschool diploma level education.

Approximately 42% of Gallia County voted in the presidential election of 2016. This represents an increase from the 2012 election by 3,054 votes.
At $43,149 the median income is 79.8% of the Ohio average. An estimated 818 people claimed to be unemployed last year in Gallia, the equivalant of around 6.7% of the county population. This represents a decrease in the level of unemployment from the previous year's value of 6.8%.

Top 15 Industries in Gallia County.
Total # Employed	Industry Job Type
2,473	Health care and social assistance
1,320	Retail trade
886	Accommodation and food services
811	Food services and drinking places
753	Electric power generation, transmission and distribution
688	Ambulatory health care services
535	Limited-service restaurants
452	Manufacturing
330	Finance and insurance
265	Credit intermediation and related activities
253	Administrative and support and waste management and remediation services
241	Other services (except public administration)
240	Administrative and support services
232	Depository credit intermediation
226	Transportation and warehousing

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