The population of Knox county is estimated at 39,655. In 2017 there were 314 births and 428 deaths in Knox county. Knox county has 8,140 housing units that are owned with a mortgage or a loan, 4,649 that are owned free and clear and 4,469 that are renter occupied.

  The gracious residents of Knox County filed 20,420 federal tax returns in 2017. This amount represents 3.1% of all Maine filings and 0.014% of the entire nation. Knox had a combined total federal tax liability of $157,095,000 on earned income of $1,132,649,000. Other notable statistics from Knox County were 670 unemployment claims which collected a total of $2,596,000 and 4,350 charitable contributions valued at $19,343,000. 5,410 filings from Knox County paid a combined total of $28,573,000 in property taxes and 4,110 filings paid $28,217,000 on mortgage interest costs.

  In 2010 Knox county had 62 religious congregations with an estimated 11,122 members.
30.5% of the Knox population has a college level Bachelors degree or higher. 6.3% have less than a highschool diploma level education.

Approximately 58% of Knox County voted in the presidential election of 2016. This represents an increase from the 2012 election by 1,019 votes.
At $51,723 the median income is 92.4% of the Maine average. An estimated 650 people claimed to be unemployed last year in Knox, the equivalant of around 3.1% of the county population. This represents a decrease in the level of unemployment from the previous year's value of 3.5%.

Top 15 Industries in Knox County.
Total # Employed	Industry Job Type
3,022	Health care and social assistance
2,656	Retail trade
1,663	Accommodation and food services
1,443	Manufacturing
1,308	Food services and drinking places
1,301	Restaurants and other eating places
859	Full-service restaurants
770	Ambulatory health care services
696	Food and beverage stores
693	Finance and insurance
657	Grocery stores
593	Other services (except public administration)
574	Supermarkets and other grocery (except convenience) stores
440	Professional, scientific, and technical services
412	Building material and garden equipment and supplies dealers

In 2018 8.07% of listings in Knox County (averaging across 3 zip codes; 4856, 4841 and 4843) dropped their price.

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