| County: | Knox County |
| State: | Maine |
| Founded Date: | April 1 |
| Founded Year: | 1860 |
| Seat Wl: | Rockland |
| Largest City Wl: | Rockland |
| Area Total Sq Mi: | 1144 |
| Area Land Sq Mi: | 365 |
| Area Water Sq Mi: | 779 |
| Area Percentage: | 68% |
| Population As Of: | 2020 |
| Population Total: | 40607 |
| Population Density Sq Mi: | auto |
| Web: | http://www.knoxcountymaine.gov/ |
| Ex Image: | Knox County Courthouse, Rockland, Maine.jpg |
| Ex Image Cap: | Knox County Courthouse |
| District: | 1st |
| Time Zone: | Eastern |
Knox County is a county located in the state of Maine, United States. As of the 2020 census, the population was 40,607.[1] Its county seat is Rockland.[2] The county is named for Revolutionary War general and Secretary of War Henry Knox,[3] who lived in the county from 1795 until his death in 1806. The county was established on April 1, 1860, and is the most recent county to be created in Maine. It was carved from parts of Waldo and Lincoln counties. The Union Fair, started in 1868, began as the efforts of the North Knox Agricultural and Horticultural Society.[4]
According to the U.S. Census Bureau, the county has a total area of, of which is land and (68%) is water.[5] It is the second-smallest county in Maine by land area. It was originally part of the Waldo Patent.
At the 2000 census there were 39,618 people, 16,608 households, and 10,728 families living in the county. The population density was 108/mi2. There were 21,612 housing units at an average density of 59/mi2. The racial makeup of the county was 98.28% White, 0.24% Black or African American, 0.22% Native American, 0.36% Asian, 0.01% Pacific Islander, 0.12% from other races, and 0.78% from two or more races. 0.57% of the population were Hispanic or Latino of any race. 25.4% were of English, 12.2% Irish, 11.7% United States or American, 7.5% German and 5.7% French ancestry. 97.1% spoke English and 1.5% French as their first language.[6] Of the 16,608 households 28.30% had children under the age of 18 living with them, 52.20% were married couples living together, 9.00% had a female householder with no husband present, and 35.40% were non-families. 29.00% of households were one person and 12.70% were one person aged 65 or older. The average household size was 2.31 and the average family size was 2.83.
The age distribution was 22.40% under the age of 18, 6.30% from 18 to 24, 27.40% from 25 to 44, 26.70% from 45 to 64, and 17.20% 65 or older. The median age was 41 years. For every 100 females there were 95.20 males. For every 100 females age 18 and over, there were 93.00 males.
The median household income was $36,774 and the median family income was $43,819. Males had a median income of $30,704 versus $22,382 for females. The per capita income for the county was $19,981. About 6.40% of families and 10.10% of the population were below the poverty line, including 11.90% of those under age 18 and 8.00% of those age 65 or over.
At the 2010 census, there were 39,736 people, 17,258 households, and 10,662 families living in the county.[7] The population density was . There were 23,744 housing units at an average density of 65/mi2.[8] The racial makeup of the county was 97.1% white, 0.5% black or African American, 0.5% Asian, 0.4% American Indian, 0.2% from other races, and 1.4% from two or more races. Those of Hispanic or Latino origin made up 0.8% of the population.[7] In terms of ancestry, 31.3% were English, 19.0% were Irish, 12.8% were German, 6.9% were Scottish, and 5.9% were American.[9]
Of the 17,258 households, 25.4% had children under the age of 18 living with them, 48.2% were married couples living together, 9.4% had a female householder with no husband present, 38.2% were non-families, and 31.0% of households were made up of individuals. The average household size was 2.22 and the average family size was 2.75. The median age was 46.2 years.[7]
The median household income was $45,264 and the median family income was $55,830. Males had a median income of $40,712 versus $29,732 for females. The per capita income for the county was $25,291. About 7.9% of families and 12.5% of the population were below the poverty line, including 16.5% of those under age 18 and 9.8% of those age 65 or over.[10]
In 2012, Knox County voted 55% in favor of a measure to legalize same-sex marriage.[11]
| Voter registration and party enrollment as of March 2024[12] | ||||||
|---|---|---|---|---|---|---|
| Democratic | align = center | align = center | ||||
| Unenrolled | align = center | align = center | ||||
| Republican | align = center | align = center | ||||
| Green Independent | align = center | align = center | ||||
| No Labels | align = center | align = center | ||||
| Libertarian | align = center | align = center | ||||
| Total | align = center | align = center | ||||
|}
An addition to the Knox County Courthouse designed by Scott Simons Architects was completed in 2005. It is connected to an annex built in 1977 that is adjacent to the historic, original building that was finished in 1874.[13]
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