The population of Jefferson county is estimated at 30,909. In 2017 there were 191 births and 376 deaths in Jefferson county. Jefferson county has 5,988 housing units that are owned with a mortgage or a loan, 4,445 that are owned free and clear and 3,616 that are renter occupied.

  The gracious residents of Jefferson County filed 16,220 federal tax returns in 2017. This amount represents 0.5% of all Washington filings and 0.011% of the entire nation. Jefferson had a combined total federal tax liability of $155,797,000 on earned income of $1,083,057,000. Other notable statistics from Jefferson County were 540 unemployment claims which collected a total of $3,060,000 and 4,100 charitable contributions valued at $17,462,000. 4,630 filings from Jefferson County paid a combined total of $19,199,000 in property taxes and 3,540 filings paid $32,031,000 on mortgage interest costs.

  In 2010 Jefferson county had 42 religious congregations with an estimated 7,474 members.
39.9% of the Jefferson population has a college level Bachelors degree or higher. 5.5% have less than a highschool diploma level education.

Approximately 62% of Jefferson County voted in the presidential election of 2016. This represents an increase from the 2012 election by 428 votes.
At $53,364 the median income is 75.2% of the Washington average. An estimated 736 people claimed to be unemployed last year in Jefferson, the equivalant of around 6.1% of the county population. This represents a decrease in the level of unemployment from the previous year's value of 7.0%.

Top 15 Industries in Jefferson County.
Total # Employed	Industry Job Type
1,370	Health care and social assistance
1,012	Retail trade
939	Accommodation and food services
721	Food services and drinking places
676	Manufacturing
645	Restaurants and other eating places
428	Full-service restaurants
369	Food and beverage stores
342	Ambulatory health care services
338	Grocery stores
256	Professional, scientific, and technical services
218	Accommodation
213	Traveler accommodation
202	Building material and garden equipment and supplies dealers
200	Hotels (except casino hotels) and motels

In 2018 11.39% of listings in Jefferson County (averaging across 2 zip codes; 98368 and 98365) dropped their price.

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