About Coos County NH
Coös County (/ˈkoʊ.ɒs/, with two syllables), frequently spelled Coos County, is a county in the U.S. state of New Hampshire. As of the 2010 census, the population was 33,055, the least of any New Hampshire county. The estimated population as of 2018 was 31,589. The county seat is Lancaster.
According to the U.S. Census Bureau, the county has a total area of 1,830 square miles (4,700 km), of which 1,795 square miles (4,650 km) is land and 35 square miles (91 km) (1.9%) is water. It is the largest county in New Hampshire by area, and it is one of only two counties in the United States to share land borders with two different states and another country, along with Boundary County, Idaho.
Much of its mountainous area is reserved as national forest, wilderness, state parks and other public areas; these encompass most of the northern portion of the White Mountains, including all the named summits of the Presidential Range (though one, Mt. Webster, lies about 200 feet (61 m) from the county line). Mt. Washington’s peak is the highest in the Northeast. The 162-mile (261 km) Cohos Trail runs the length of the county.
The principal state highways in Coös County are New Hampshire Route 16, which runs mostly parallel to the Maine state line and through the city of Berlin, and New Hampshire Route 26, which traverses the Great North Woods from Vermont Route 102 southeast to Maine Route 26 towards Portland. The two major US Highways are US Route 2, which roughly bisects the county from Lancaster to the Oxford County line, and US Route 3, which runs from Carroll in the south to the Canada–US border at Pittsburg/Chartierville, where it continues as Quebec Route 257.
Coös County is the least populated of all New Hampshire counties, and the only one with significant amounts of unincorporated land; over half of the municipal-like entities are unincorporated townships, gores, or grants, a rarity in New England, where nearly all of the land is incorporated as towns or cities. The population of these unincorporated territories is minuscule; collectively they account for less than 1% of the population of the county, with only three (Wentworth’s Location, Millsfield, and Dixville) reporting populations in the double digits for recent censuses. Approximately 1/3 of the population lives in Berlin, the only city, most populous municipality, and economic hub. Lancaster serves as the county seat.
As of the census of 2000, there were 33,111 people, 13,961 households, and 9,158 families residing in the county. The population density was 18 people per square mile (7/km²). There were 19,623 housing units at an average density of 11 per square mile (4/km²). The racial makeup of the county was 98.05% White, 0.12% Black or African American, 0.28% Native American, 0.37% Asian, 0.02% Pacific Islander, 0.16% from other races, and 1.00% from two or more races. 0.61% of the population were Hispanic or Latino of any race. 23.5% were of French, 19.8% French Canadian, 14.2% English, 10.2% Irish and 10.0% American ancestry. 16.17% of the population speak French at home. 
There were 13,961 households out of which 28.10% had children under the age of 18 living with them, 52.30% were married couples living together, 8.80% had a female householder with no husband present, and 34.40% were non-families. 28.80% of all households were made up of individuals and 14.10% had someone living alone who was 65 years of age or older. The average household size was 2.33 and the average family size was 2.82.
In the county, the population was spread out with 22.80% under the age of 18, 6.30% from 18 to 24, 26.70% from 25 to 44, 25.70% from 45 to 64, and 18.50% who were 65 years of age or older. The median age was 42 years. For every 100 females there were 95.60 males. For every 100 females age 18 and over, there were 92.60 males.
The median income for a household in the county was $33,593, and the median income for a family was $40,654. Males had a median income of $32,152 versus $21,088 for females. The per capita income for the county was $17,218. About 6.80% of families and 10.00% of the population were below the poverty line, including 10.70% of those under age 18 and 12.50% of those age 65 or over.
As of the 2010 United States Census, there were 33,055 people, 14,171 households, and 8,879 families residing in the county. The population density was 18.4 inhabitants per square mile (7.1/km). There were 21,321 housing units at an average density of 11.9 per square mile (4.6/km). The racial makeup of the county was 96.9% white, 0.5% Asian, 0.4% American Indian, 0.4% black or African American, 0.3% from other races, and 1.4% from two or more races. Those of Hispanic or Latino origin made up 1.2% of the population.
Of the 14,171 households, 25.3% had children under the age of 18 living with them, 48.5% were married couples living together, 9.2% had a female householder with no husband present, 37.3% were non-families, and 30.3% of all households were made up of individuals. The average household size was 2.23 and the average family size was 2.72. The median age was 46.4 years.
18.9% of the population were under the age of 18, 6.7% were from age 18 to 24, 22.1% were from 25 to 44, 32.9% were from 45 to 64, and 19.4% were age 65 or older. The median age was 46.4 years. For every 100 females there were 103.4 males, and for every 100 females age 18 and older, there were 101.8 males.
During the period 2011-2015, the largest self-reported ancestry groups in the county were 39.3% French or French Canadian, 16.9% Irish, 14.2% English, 7.2% “American”, 5.5% Italian, 4.9% German, and 3.6% Scottish.
During 2011-2015, the estimated median annual income for a household in the county was $42,312, and the median income for a family was $55,385. Male full-time workers had a median income of $41,934 versus $34,859 for females. The per capita income for the county was $24,546. About 9.9% of families and 14.1% of the population were below the poverty line, including 21.7% of those under age 18 and 8.2% of those age 65 or over.
Coos County New Hampshire neighborhoods include: Albany, Alexandria, Allenstown, Alstead, Alton, Amherst, Andover, Antrim, Ashland, Atkinson, Auburn, Barnstead, Barrington, Bath, Bedford, Belmont, Bennington, Benton, Berlin, Bethlehem, Boscawen, Bow, Bradford, Brentwood, Bristol, Brookfield, Brookline, Campton, Canaan, Candia, Canterbury, Center Harbor, Center Ossipee, Charlestown, Chichester, Claremont, Colebrook, Concord, Contoocook, Conway, Cornish, Croydon, Deerfield, Deering, Derry, Dorchester, Dover, Dublin, Dummer, Dunbarton, Durham, East Hampstead, East Wakefield, Effingham, Enfield, Epping, Epsom, Exeter, Francestown, Franconia, Franklin, Freedom, Fremont, Gilford, Gilmanton, Gilmanton Iron Works, Gilsum, Goffstown, Gorham, Grafton, Grantham, Greenfield, Greenland, Greenville, Groveton, Hampstead, Hampton, Hampton Falls, Hanover, Harrisville, Haverhill, Hebron, Henniker, Hillsborough, Hinsdale, Holderness, Hollis, Hooksett, Hopkinton, Hudson, Jackson, Jaffrey, Keene, Kensington, Kingston, Laconia, Lancaster, Landaff, Langdon, Lee, Lempster, Lisbon, Litchfield, Littleton, Londonderry, Loudon, Lyme, Lyndeborough, Madbury, Madison, Manchester, Marlborough, Marlow, Mason, Meredith, Meriden, Merrimack, Middleton, Milan, Milford, Milton, Mont Vernon, Munsonville, Nashua, Nelson, New Boston, Newbury, New Castle, Newfields, Newington, New Ipswich, New London, Newmarket, Newport, Newton, Northfield, North Hampton, North Haverhill, North Stratford, Northwood, Nottingham, Orange, Orford, Ossipee, Pelham, Pembroke, Penacook, Peterborough, Piermont, Pike, Pittsfield, Plainfield, Plaistow, Plymouth, Portsmouth, Rindge, Rochester, Rumney, Rye, Salem, Salisbury, Sanbornton, Sanbornville, Seabrook, Sharon, Silver Lake, South Acworth, Springfield, Stoddard, Strafford, Stratham, Sugar Hill, Sunapee, Suncook, Surry, Swanzey, Thornton, Tilton, Troy, Union, Warner, Washington, Weare, West Chesterfield, West Ossipee, Whitefield, Wilmot, Wilton, Winchester, Windham, Windsor, Wolfeboro, Woodsville
For more information, see Coos County New Hampshire wiki