The population of Mercer county is estimated at 373,660 where 248,880 speak English exclusively and 4,035 speak primarily in another language. In 2017 there were 4,039 births and 2,941 deaths in Mercer county. Mercer county has 64,356 housing units that are owned with a mortgage or a loan, 23,344 that are owned free and clear and 45,455 that are renter occupied.

  The residents of Mercer County filed 174,760 federal tax returns in 2017. This amount represents 4.0% of all New Jersey filings and 0.117% of the entire nation. Mercer had an impressive combined total federal tax liability of $3,171,898,000 on earned income of $16,413,869,000. Other notable statistics from Mercer County were 8,370 unemployment claims which collected a total of $50,737,000 and 62,700 charitable contributions valued at $345,564,000. 64,410 filings from Mercer County paid a combined total of $658,094,000 in property taxes and 50,660 filings paid $422,095,000 on mortgage interest costs.

  In 2010 Mercer county had 276 religious congregations with an estimated 192,783 members.
41.5% of the Mercer population has a college level Bachelors degree or higher. 12.1% have less than a highschool diploma level education.

Approximately 38% of Mercer County voted in the presidential election of 2016. This is an increase from the 2012 election by 2,268 votes.
At $78,161 the median income is 97.6% of the New Jersey average. An estimated 8,163 people claimed to be unemployed last year in Mercer, the equivalant of around 4.1% of the county population. This represents a decrease in the level of unemployment from the previous year's value of 4.4%.

Top 15 Industries in Mercer County.
Total # Employed	Industry Job Type
28,970	Health care and social assistance
21,394	Professional, scientific, and technical services
18,794	Retail trade
15,261	Administrative and support and waste management and remediation services
15,253	Finance and insurance
14,647	Administrative and support services
11,894	Accommodation and food services
11,084	Food services and drinking places
10,524	Ambulatory health care services
10,089	Employment services
9,226	Hospitals
8,627	Restaurants and other eating places
7,070	Manufacturing
6,745	General medical and surgical hospitals
6,745	General medical and surgical hospitals, except government

In 2018 the average price reduction was 3.67% in Mercer County (averaging across 13 zip codes a sample of which are; 8691, 8550, 8690 and 8648).

In 2018 16.12% of listings in Mercer County (averaging across 17 zip codes a sample of which are; 8611, 8520 and 8620) dropped their price.

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