Demographics
Historical population| Census | Pop. | Note | %± |
|---|
| 1790 | 23,611 | | — |
|---|
| 1800 | 32,614 | | 38.1% |
|---|
| 1810 | 41,595 | | 27.5% |
|---|
| 1820 | 51,117 | | 22.9% |
|---|
| 1830 | 58,910 | | 15.2% |
|---|
| 1840 | 61,127 | | 3.8% |
|---|
| 1850 | 29,374 | | −51.9% |
|---|
| 1860 | 31,493 | | 7.2% |
|---|
| 1870 | 30,243 | | −4.0% |
|---|
| 1880 | 35,558 | | 17.6% |
|---|
| 1890 | 38,442 | | 8.1% |
|---|
| 1900 | 39,337 | | 2.3% |
|---|
| 1910 | 38,951 | | −1.0% |
|---|
| 1920 | 38,546 | | −1.0% |
|---|
| 1930 | 38,580 | | 0.1% |
|---|
| 1940 | 43,553 | | 12.9% |
|---|
| 1950 | 51,567 | | 18.4% |
|---|
| 1960 | 59,799 | | 16.0% |
|---|
| 1970 | 70,431 | | 17.8% |
|---|
| 1980 | 85,408 | | 21.3% |
|---|
| 1990 | 104,233 | | 22.0% |
|---|
| 2000 | 112,233 | | 7.7% |
|---|
| 2010 | 123,143 | | 9.7% |
|---|
| 2020 | 130,889 | | 6.3% |
|---|
|
2000 census
As of the census [10] of 2000, there were 112,233 people, 42,581 households, and 27,762 families living in the county. The population density was 304 inhabitants per square mile (117/km2). There were 45,539 housing units at an average density of 124 units per square mile (48/km2). The racial makeup of the county was 96.29% White, 0.63% Black or African American, 0.21% Native American, 1.39% Asian, 0.05% Pacific Islander, 0.30% from other races, and 1.14% from two or more races. 1.03% of the population were Hispanic or Latino of any race. 15.8% were of English, 14.9% Irish, 14.0% French, 10.5% French Canadian, 7.6% American, 6.3% Italian and 6.2% German ancestry. 93.7% spoke English and 3.2% French as their first language.
There were 42,581 households, out of which 32.60% had children under the age of 18 living with them, 51.10% were married couples living together, 10.00% had a female householder with no husband present, and 34.80% were non-families. 24.80% of all households were made up of individuals, and 8.20% had someone living alone who was 65 years of age or older. The average household size was 2.50 and the average family size was 2.98.
In the county, the population was spread out, with 23.70% under the age of 18, 13.60% from 18 to 24, 30.60% from 25 to 44, 20.90% from 45 to 64, and 11.20% who were 65 years of age or older. The median age was 34 years. For every 100 females, there were 94.30 males. For every 100 females age 18 and over, there were 91.10 males.
The median income for a household in the county was $44,803, and the median income for a family was $53,075. Males had a median income of $36,661 versus $26,208 for females. The per capita income for the county was $20,479. About 5.00% of families and 9.20% of the population were below the poverty line, including 9.10% of those under age 18 and 6.60% of those age 65 or over.
The largest cities in Strafford County are Dover (population) and Rochester (land area) .
2010 census
As of the 2010 United States Census, there were 123,143 people, 47,100 households, and 29,862 families living in the county. [11] The population density was 333.7 inhabitants per square mile (128.8/km2). There were 51,697 housing units at an average density of 140.1 per square mile (54.1/km2). [12] The racial makeup of the county was 93.8% white, 2.6% Asian, 1.0% black or African American, 0.2% American Indian, 0.5% from other races, and 1.9% from two or more races. Those of Hispanic or Latino origin made up 1.8% of the population. [11] In terms of ancestry, 24.4% were French or French Canadian, 19.7% were Irish, 17.4% were English, 9.5% were Italian, 8.7% were German, 5.2% were American, and 5.0% were Scottish. [13]
Of the 47,100 households, 30.6% had children under the age of 18 living with them, 48.4% were married couples living together, 10.5% had a female householder with no husband present, 36.6% were non-families, and 26.3% of all households were made up of individuals. The average household size was 2.44 and the average family size was 2.93. The median age was 36.9 years. [11]
The median income for a household in the county was $57,809 and the median income for a family was $72,286. Males had a median income of $50,489 versus $37,178 for females. The per capita income for the county was $28,059. About 6.7% of families and 11.3% of the population were below the poverty line, including 12.3% of those under age 18 and 8.0% of those age 65 or over. [14]
Merrimack County is a county in the U.S. state of New Hampshire. As of the 2020 Census, the population was 153,808, making it the third-most populous county in New Hampshire. Its county seat is Concord, the state capital. The county was organized in 1823 from parts of Hillsborough and Rockingham counties, and is named for the Merrimack River. Merrimack County comprises the Concord, NH Micropolitan Statistical Area, which in turn constitutes a portion of the Boston–Worcester–Providence, MA–RI–NH–CT Combined Statistical Area. In 2010, the center of population of New Hampshire was located in Merrimack County, in the town of Pembroke.
Carroll County is a county in the U.S. state of New Hampshire. As of the 2020 census, the population was 50,107, making it the third-least populous county in New Hampshire. Its county seat is Ossipee. The county was created in 1840 and organized at Ossipee from towns removed from Strafford County. It was named in honor of Charles Carroll of Carrollton, who had died in 1832, the last surviving signer of the United States Declaration of Independence.
Belknap County is a county in the U.S. state of New Hampshire. As of the 2020 census, the population was 63,705. The county seat is Laconia. It is located in New Hampshire's Lakes Region, slightly southeast of the state's geographic center. Belknap County comprises the Laconia, NH Micropolitan Statistical Area, which in turn constitutes a portion of the Boston-Worcester-Providence, MA-RI-NH-CT Combined Statistical Area.
York County is the southwesternmost county in the U.S. state of Maine, along the state of New Hampshire's eastern border. It is divided from Strafford County, New Hampshire, by the Salmon Falls River and the connected tidal estuary, the Piscataqua River. York County was permanently established in 1639. Several of Maine's earliest colonial settlements are found in the county, which is the state's oldest and one of the oldest in the United States. As of the 2020 census, its population was 211,972, making it Maine's second-most populous county. Its county seat is Alfred. York County is part of the Portland–South Portland, Maine Metropolitan Statistical Area.
Strafford is a city in eastern Greene County, Missouri, United States. It is part of the Springfield, Missouri Metropolitan Statistical Area. The city's population was 2,561 at the 2020 census.
Barnstead is a town in Belknap County, New Hampshire, United States. The population was 4,915 at the 2020 census, up from 4,593 at the 2010 census. Home to the Suncook Lakes, Barnstead includes the villages of Center Barnstead, Barnstead Parade and South Barnstead.
Brookfield is a town in Carroll County, New Hampshire, United States. The population was 755 at the 2020 census.
Northwood is a town in Rockingham County, New Hampshire, United States. The population was 4,641 at the 2020 census.
Barrington is a town in Strafford County, New Hampshire, United States. The population was 9,326 at the 2020 census, up from 8,576 at the 2010 census. The town is a woodland, farm and commuter town.
Lee is a town in Strafford County, New Hampshire, United States. The population was 4,520 at the 2020 census. The town is a rural farm and bedroom community, being close to the University of New Hampshire.
Madbury is a town in Strafford County, New Hampshire, United States. The population was 1,918 at the 2020 census.
Middleton is a town in Strafford County, New Hampshire, United States. The population was 1,823 at the 2020 census.
Milton is a town in Strafford County, New Hampshire, United States. The population was 4,482 at the 2020 census. A manufacturing, resort and residential town, Milton includes the village of Milton Mills. The primary village in town, where 593 people resided at the 2020 census, is defined as the Milton census-designated place (CDP), and is located along New Hampshire Route 125 and the Salmon Falls River, just north of Route 75.
New Durham is a town in Strafford County, New Hampshire, United States. The population was 2,693 at the 2020 census. It is drained by the Merrymeeting, Cocheco and Ela rivers, and is known for Merrymeeting Lake. New Durham is home to the Powder Mill Fish Hatchery, located on Merrymeeting Road. Also located here is the Lions Club's Camp Pride, a camp for children and adults with special needs.
Rollinsford is a town in Strafford County, New Hampshire, United States. The population was 2,597 at the 2020 census. The main village in town was once known as "Salmon Falls Village".
Somersworth is a city in Strafford County, New Hampshire, United States. The population was 11,855 at the 2020 census. Somersworth has the smallest area and third-lowest population of New Hampshire's 13 cities.
Strafford is a town in Strafford County, New Hampshire, United States. The population was 4,230 at the 2020 census. The two main settlements in town are Center Strafford and Bow Lake Village.
Strafford is a town in Orange County, Vermont, United States. The population was 1,094 at the 2020 census. The town of Strafford was created on August 12, 1761 by way of a royal charter which King George III of Great Britain issued to Governor Benning Wentworth of New Hampshire. The town was named after the Earl of Strafford. Its town house is one of the most famous in Vermont, sitting atop a hill in the historic town square.
Farmington is a census-designated place (CDP) and the main village in the town of Farmington, Strafford County, New Hampshire, United States. The population of the CDP was 3,824 at the 2020 census, out of 6,722 in the entire town.
Farmington is a town in Strafford County, New Hampshire, United States. The population was 6,722 at the 2020 census. Farmington is home to Blue Job State Forest, the Tebbetts Hill Reservation, and Baxter Lake.
United States
New Hampshire 
