Mount Joy, Pennsylvania demographics

Mount Joy, PA demographics: median age 39.5; 33.7% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Mount Joy borough, Pennsylvania · Incorporated borough · GEOID 4251656. The survey estimates a population of 8,344 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Mount Joy is 39.5 years, with a 90% margin of error of 2.9 years. There are 3,532 households (±242). Age and household distributions show how these totals are composed; they do not establish which neighborhood suits a particular person.

Every count and share is an estimate. “±” is a 90% margin of error (MOE); pp means percentage points. Derived shares use the category count divided by the named universe. Aggregated category MOEs and percentage MOEs are approximate. A margin larger than half its estimate is flagged as low precision. Blank source uncertainty is shown as unavailable, never zero.

Age distribution and sex

City, state and U.S. estimates · ACS 2020–2024
Measure / survey universe	City estimate ± MOE	State estimate ± MOE	U.S. estimate ± MOE
Median age Total population · years	39.5 ±2.9	40.9 ±0.2	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 8,344
Category	Count ± MOE	Share ± MOE (pp)	Pennsylvania	U.S.
Under 18	1,856 ±414	22.2% ±5.0 pp	20.4%	22.0%
18–34	1,844 ±295	22.1% ±3.5 pp	21.9%	22.8%
35–64	2,947 ±402	35.3% ±4.8 pp	38.1%	38.0%
65 and older	1,697 ±254	20.3% ±3.0 pp	19.5%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 8,344
Category	Count ± MOE	Share ± MOE (pp)	Pennsylvania	U.S.
Male	4,107 ±229	49.2% ±2.7 pp	49.3%	49.5%
Female	4,237 ±226	50.8% ±2.7 pp	50.7%	50.5%

The age groups are mutually exclusive and cover the entire population. The sex categories follow this ACS table’s published classification; they are not a survey of gender identity.

Race and Hispanic origin

Race · B02001 · ACS 2020–2024 Total population: 8,344
Category	Count ± MOE	Share ± MOE (pp)	Pennsylvania	U.S.
White alone	6,945 ±422	83.2% ±5.1 pp	74.5%	61.0%
Black or African American alone	159 ±124 · low precision	1.9% ±1.5 pp · low precision	10.6%	12.2%
American Indian and Alaska Native alone	0 ±17 · low precision	0.0% ±0.2 pp · low precision	0.2%	0.9%
Asian alone	94 ±80 · low precision	1.1% ±1.0 pp · low precision	3.8%	6.0%
Native Hawaiian and Other Pacific Islander alone	0 ±17 · low precision	0.0% ±0.2 pp · low precision	0.0%	0.2%
Some other race alone	353 ±212 · low precision	4.2% ±2.5 pp · low precision	3.7%	7.1%
Two or more races	793 ±342	9.5% ±4.1 pp	7.1%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 8,344
Category	Count ± MOE	Share ± MOE (pp)	Pennsylvania	U.S.
Not Hispanic or Latino	7,245 ±407	86.8% ±4.9 pp	91.3%	80.7%
Hispanic or Latino	1,099 ±407	13.2% ±4.9 pp	8.7%	19.3%

Hispanic origin and race are separate questions. People of Hispanic or Latino origin may be of any race and appear in both tables. Do not add the Hispanic share to race shares. Race alone and two-or-more-race groups are the mutually exclusive categories of the race table.

Household types, children and living alone

Household types · B11001 · ACS 2020–2024 Households: 3,532
Category	Count ± MOE	Share ± MOE (pp)	Pennsylvania	U.S.
Married-couple family	1,649 ±177	46.7% ±3.9 pp	46.2%	46.9%
Other family: male householder, no spouse present	170 ±114 · low precision	4.8% ±3.2 pp · low precision	4.7%	5.1%
Other family: female householder, no spouse present	395 ±175	11.2% ±4.9 pp	11.5%	12.2%
Nonfamily: householder living alone	1,044 ±223	29.6% ±6.0 pp	30.9%	28.7%
Nonfamily: householder not living alone	274 ±98	7.8% ±2.7 pp	6.7%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 3,532
Category	Count ± MOE	Share ± MOE (pp)	Pennsylvania	U.S.
Households with people under 18	964 ±156	27.3% ±4.0 pp	27.0%	29.5%
Households without people under 18	2,568 ±300	72.7% ±6.9 pp	73.0%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 3,532
Category	Count ± MOE	Share ± MOE (pp)	Pennsylvania	U.S.
One-person nonfamily households	1,044 ±223	29.6% ±6.0 pp	30.9%	28.7%
Two-person households	1,353 ±229	38.3% ±5.9 pp	34.7%	33.8%
Three-person households	511 ±186	14.5% ±5.2 pp	14.9%	15.3%
Four-person households	374 ±136	10.6% ±3.8 pp	11.7%	12.6%
Five-person households	116 ±54	3.3% ±1.5 pp	5.0%	5.9%
Six-person households	116 ±84 · low precision	3.3% ±2.4 pp · low precision	1.7%	2.2%
Seven or more people	18 ±29 · low precision	0.5% ±0.8 pp · low precision	1.1%	1.4%

A family household contains related people under the Census definition. A nonfamily household can contain one person or unrelated people sharing a home. Households with children can also appear in the household-type and size tables, so those tables must not be added together. Household estimates exclude people living in group quarters from the household universe.

Nativity and languages spoken at home

Nativity · B05002 · ACS 2020–2024 Total population: 8,344
Category	Count ± MOE	Share ± MOE (pp)	Pennsylvania	U.S.
Native	8,025 ±187	96.2% ±2.2 pp	92.3%	85.9%
Foreign born	319 ±187 · low precision	3.8% ±2.2 pp · low precision	7.7%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 7,931
Category	Count ± MOE	Share ± MOE (pp)	Pennsylvania	U.S.
English only	7,205 ±336	90.8% ±3.9 pp	87.6%	77.7%
Spanish	498 ±239	6.3% ±3.0 pp	5.6%	13.6%
French, Haitian, or Cajun	0 ±17 · low precision	0.0% ±0.2 pp · low precision	0.5%	0.7%
German or other West Germanic	66 ±52 · low precision	0.8% ±0.7 pp · low precision	0.9%	0.5%
Russian, Polish, or other Slavic	0 ±17 · low precision	0.0% ±0.2 pp · low precision	0.8%	0.7%
Other Indo-European	90 ±88 · low precision	1.1% ±1.1 pp · low precision	1.7%	2.0%
Korean	0 ±17 · low precision	0.0% ±0.2 pp · low precision	0.2%	0.3%
Chinese, including Mandarin and Cantonese	0 ±17 · low precision	0.0% ±0.2 pp · low precision	0.8%	1.1%
Vietnamese	12 ±19 · low precision	0.2% ±0.2 pp · low precision	0.3%	0.5%
Tagalog, including Filipino	14 ±22 · low precision	0.2% ±0.3 pp · low precision	0.2%	0.6%
Other Asian and Pacific Island	0 ±17 · low precision	0.0% ±0.2 pp · low precision	0.7%	1.1%
Arabic	21 ±31 · low precision	0.3% ±0.4 pp · low precision	0.4%	0.5%
Other and unspecified	25 ±39 · low precision	0.3% ±0.5 pp · low precision	0.5%	0.8%

Foreign born means not a U.S. citizen at birth; it includes naturalized citizens. Language categories describe speech at home among people age five and older. A language other than English at home does not establish that someone cannot speak English. This city page uses the published C16001 summary categories because the more detailed B16001 table does not provide these city records in this release.

Educational attainment

Highest completed education · B15003 · ACS 2020–2024 Population age 25 and older: 6,032
Category	Count ± MOE	Share ± MOE (pp)	Pennsylvania	U.S.
Less than high school graduate	305 ±123	5.1% ±2.0 pp	7.9%	10.4%
High school graduate or equivalency	2,149 ±293	35.6% ±4.6 pp	32.9%	26.0%
Some college, no degree	855 ±174	14.2% ±2.8 pp	15.1%	19.1%
Associate’s degree	690 ±222	11.4% ±3.6 pp	8.9%	8.8%
Bachelor’s degree	1,329 ±263	22.0% ±4.2 pp	20.9%	21.6%
Graduate or professional degree	704 ±182	11.7% ±3.0 pp	14.3%	14.1%

The denominator excludes residents under 25. Each person is counted in the highest attainment category they completed. This table does not measure the quality of local schools or the education level of every current student.

Residence one year earlier

Geographic mobility · B07003 · ACS 2020–2024 Population age 1 and older: 8,250
Category	Count ± MOE	Share ± MOE (pp)	Pennsylvania	U.S.
Same house	7,014 ±356	85.0% ±4.2 pp	89.3%	87.7%
Moved within same county	805 ±305	9.8% ±3.7 pp	5.6%	6.3%
Moved from a different county in the same state	289 ±140	3.5% ±1.7 pp	2.6%	3.1%
Moved from a different state	117 ±93 · low precision	1.4% ±1.1 pp · low precision	1.9%	2.3%
Moved from abroad	25 ±39 · low precision	0.3% ±0.5 pp · low precision	0.4%	0.6%

These are respondents’ residence patterns one year before their survey response, pooled across the five-year window. They are not a net migration count for 2025. A person can move to a different house within the same city or county; moves within the same county should not automatically be interpreted as new arrivals to the city.

Health insurance, internet access and veterans

4.2% of Mount Joy residents (±1.9 percentage points) had no health insurance coverage when surveyed, compared with 5.6% in Pennsylvania and 8.4% nationally. 95.2% of households subscribe to broadband of any type, including cellular data plans. A subscription is not the same as available service: the FCC National Broadband Map shows providers at a specific address.

City, state and U.S. shares · ACS 2020–2024
Measure	Mount Joy	Pennsylvania	U.S.	Compared with Pennsylvania
People without health insurance Civilian noninstitutionalized population	4.2% ±1.9 pp	5.6%	8.4%	Not statistically different
Households with a broadband subscription Households	95.2% ±2.8 pp	89.7%	91.0%	Higher
Veterans Civilian population age 18 and older	5.8% ±1.8 pp	6.1%	6.2%	Not statistically different

Reading and reusing the estimates

The Census table links above lead to the original detailed tables. Counts, source universes and uncertainty are retained in the source observation download for Mount Joy . Compare these figures with the same survey window; do not compare one city’s five-year estimate with another city’s annual estimate as though they measured the same period. For methods, see uncertainty and denominator calculations.

Read Mount Joy housing and cost context or return to the city profile.