What stands out worked out from the figures below

New Castle has the most expensive homes ($1701k median).

Newmarket has the most affordable homes ($455k median).

What matters to you?

Pick a few. We’ll pull those rows to the top and mark which town comes out ahead on each. There’s no overall score: what matters is up to you.

Raising kidsAffordabilityOwning a homeShort commuteWorking from homeYounger crowdSettled, older crowdGrowing town

Measure	New Castle	Newmarket
People
Population	827Lowest	9,463Highest
Growth since 20102010 → 2020 census	+3.3%Lowest NH: +4.6%	+5.5%Highest NH: +4.6%
Median age	62.8±6Highest 45% above NH	41.2±1.9Lowest 5% below NH
Kids under 18	12.9%±7.1Lowest NH: 18.2%	15.6%±2.7Highest NH: 18.2%
	Newmarket and New Castle are within the Census margin of error here, so we can’t say which is really higher.
Age 65+	44.3%±16.1Highest NH: 20.1%	16.1%±2.8Lowest NH: 20.1%
Bachelor’s degree+adults 25+	68.8%Highest NH: 40.6%	49.7%Lowest NH: 40.6%
Enrolled in collegeshare of residents	0.6%±1.8Lowest NH: 6%	5.6%±1.9Highest NH: 6%
Cost of living
Household incomemedian	$176,953±$29kHighest 79% above NH	$100,845±$13kLowest about the NH average
Home valuemedian, owner-occupied	$1,701,300±$267kHighest 323% above NH	$455,000±$22kLowest 13% above NH
Rentmedian gross, monthly	$3,501Highest 135% above NH	$1,671±$69Lowest 12% above NH
Property taxmedian, yearly	$8,509Lowest 28% above NH	$8,734Highest 31% above NH
Renters paying 30%+of income on rent	0%±85.7Lowest NH: 48.2%	46.3%±8.3Highest NH: 48.2%
	Newmarket and New Castle are within the Census margin of error here, so we can’t say which is really higher.
Below poverty line	4.6% NH: 7.2%	4.6% NH: 7.2%
Housing
Homeownersof occupied homes	93%Highest NH: 72.8%	52.9%Lowest NH: 72.8%
Typical home builtmedian year	1975Lowest 4 yrs older than NH	1983Highest 4 yrs newer than NH
Getting to work
Average commuteone way	33 minHighest 22% above NH	28 minLowest 6% above NH
Work from home	40.1%±19.4Highest NH: 16.8%	17.3%±3.3Lowest NH: 16.8%
Schools
Public school scoresrank in state, math + reading	—	#39 of 120 in NH
School district	New Castle School District	Newmarket School District
High school in town	None in town	Newmarket Jr.-Sr. High School
Students per teacherat that high school	—	9.9
On TownTapestry
Old photos in Our Story	None yet	None yet

NH average · Sources: U.S. Census Bureau, American Community Survey 5-year estimates 2020–2024; 2010 & 2020 decennial census; NCES Common Core of Data. “±” is the Census margin of error. Property tax is top-coded by the Census at $10,000+. School rank compares math and reading proficiency against the state average.