St. Johns, Arizona demographics

St. Johns, AZ demographics: median age 23.6; 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 · St. Johns city, Arizona · Incorporated city · GEOID 0462350. The survey estimates a population of 3,395 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in St. Johns is 23.6 years, with a 90% margin of error of 16.3 years. There are 763 households (±168). 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	23.6 ±16.3 · low precision	39.0 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 3,395
Category	Count ± MOE	Share ± MOE (pp)	Arizona	U.S.
Under 18	1,549 ±312	45.6% ±9.2 pp	21.6%	22.0%
18–34	406 ±183	12.0% ±5.4 pp	23.2%	22.8%
35–64	1,158 ±322	34.1% ±9.5 pp	36.2%	38.0%
65 and older	282 ±144 · low precision	8.3% ±4.2 pp · low precision	18.9%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 3,395
Category	Count ± MOE	Share ± MOE (pp)	Arizona	U.S.
Male	1,716 ±192	50.5% ±5.6 pp	49.9%	49.5%
Female	1,679 ±188	49.5% ±5.5 pp	50.1%	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: 3,395
Category	Count ± MOE	Share ± MOE (pp)	Arizona	U.S.
White alone	2,659 ±352	78.3% ±10.4 pp	59.0%	61.0%
Black or African American alone	247 ±165 · low precision	7.3% ±4.9 pp · low precision	4.6%	12.2%
American Indian and Alaska Native alone	28 ±36 · low precision	0.8% ±1.1 pp · low precision	4.0%	0.9%
Asian alone	0 ±14 · low precision	0.0% ±0.4 pp · low precision	3.6%	6.0%
Native Hawaiian and Other Pacific Islander alone	0 ±14 · low precision	0.0% ±0.4 pp · low precision	0.2%	0.2%
Some other race alone	104 ±131 · low precision	3.1% ±3.9 pp · low precision	9.1%	7.1%
Two or more races	357 ±214 · low precision	10.5% ±6.3 pp · low precision	19.5%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 3,395
Category	Count ± MOE	Share ± MOE (pp)	Arizona	U.S.
Not Hispanic or Latino	2,705 ±250	79.7% ±7.3 pp	68.6%	80.7%
Hispanic or Latino	690 ±247	20.3% ±7.3 pp	31.4%	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: 763
Category	Count ± MOE	Share ± MOE (pp)	Arizona	U.S.
Married-couple family	581 ±130	76.1% ±3.0 pp	46.7%	46.9%
Other family: male householder, no spouse present	29 ±53 · low precision	3.8% ±6.9 pp · low precision	5.6%	5.1%
Other family: female householder, no spouse present	48 ±71 · low precision	6.3% ±9.2 pp · low precision	11.9%	12.2%
Nonfamily: householder living alone	105 ±101 · low precision	13.8% ±12.9 pp · low precision	27.5%	28.7%
Nonfamily: householder not living alone	0 ±14 · low precision	0.0% ±1.8 pp · low precision	8.2%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 763
Category	Count ± MOE	Share ± MOE (pp)	Arizona	U.S.
Households with people under 18	518 ±119	67.9% ±4.4 pp	28.7%	29.5%
Households without people under 18	245 ±157 · low precision	32.1% ±19.3 pp · low precision	71.3%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 763
Category	Count ± MOE	Share ± MOE (pp)	Arizona	U.S.
One-person nonfamily households	105 ±101 · low precision	13.8% ±12.9 pp · low precision	27.5%	28.7%
Two-person households	53 ±61 · low precision	6.9% ±7.8 pp · low precision	35.6%	33.8%
Three-person households	193 ±125 · low precision	25.3% ±15.4 pp · low precision	14.3%	15.3%
Four-person households	122 ±91 · low precision	16.0% ±11.4 pp · low precision	11.8%	12.6%
Five-person households	126 ±112 · low precision	16.5% ±14.2 pp · low precision	6.1%	5.9%
Six-person households	118 ±51	15.5% ±5.7 pp	2.8%	2.2%
Seven or more people	46 ±66 · low precision	6.0% ±8.5 pp · low precision	1.9%	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: 3,395
Category	Count ± MOE	Share ± MOE (pp)	Arizona	U.S.
Native	3,364 ±63	99.1% ±1.7 pp	87.0%	85.9%
Foreign born	31 ±55 · low precision	0.9% ±1.6 pp · low precision	13.0%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 3,235
Category	Count ± MOE	Share ± MOE (pp)	Arizona	U.S.
English only	3,085 ±190	95.4% ±3.5 pp	74.3%	77.7%
Spanish	136 ±121 · low precision	4.2% ±3.7 pp · low precision	19.3%	13.6%
French, Haitian, or Cajun	0 ±14 · low precision	0.0% ±0.4 pp · low precision	0.3%	0.7%
German or other West Germanic	0 ±14 · low precision	0.0% ±0.4 pp · low precision	0.3%	0.5%
Russian, Polish, or other Slavic	0 ±14 · low precision	0.0% ±0.4 pp · low precision	0.4%	0.7%
Other Indo-European	0 ±14 · low precision	0.0% ±0.4 pp · low precision	1.1%	2.0%
Korean	0 ±14 · low precision	0.0% ±0.4 pp · low precision	0.2%	0.3%
Chinese, including Mandarin and Cantonese	0 ±14 · low precision	0.0% ±0.4 pp · low precision	0.5%	1.1%
Vietnamese	0 ±14 · low precision	0.0% ±0.4 pp · low precision	0.3%	0.5%
Tagalog, including Filipino	0 ±14 · low precision	0.0% ±0.4 pp · low precision	0.4%	0.6%
Other Asian and Pacific Island	0 ±14 · low precision	0.0% ±0.4 pp · low precision	0.7%	1.1%
Arabic	0 ±14 · low precision	0.0% ±0.4 pp · low precision	0.4%	0.5%
Other and unspecified	14 ±23 · low precision	0.4% ±0.7 pp · low precision	1.9%	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: 1,668
Category	Count ± MOE	Share ± MOE (pp)	Arizona	U.S.
Less than high school graduate	39 ±62 · low precision	2.3% ±3.7 pp · low precision	10.6%	10.4%
High school graduate or equivalency	219 ±130 · low precision	13.1% ±7.4 pp · low precision	23.5%	26.0%
Some college, no degree	545 ±243	32.7% ±13.0 pp	23.3%	19.1%
Associate’s degree	303 ±138	18.2% ±7.4 pp	9.3%	8.8%
Bachelor’s degree	327 ±143	19.6% ±7.6 pp	20.3%	21.6%
Graduate or professional degree	235 ±240 · low precision	14.1% ±14.1 pp · low precision	13.0%	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: 3,344
Category	Count ± MOE	Share ± MOE (pp)	Arizona	U.S.
Same house	3,203 ±144	95.8% ±3.8 pp	85.7%	87.7%
Moved within same county	108 ±108 · low precision	3.2% ±3.2 pp · low precision	8.5%	6.3%
Moved from a different county in the same state	0 ±14 · low precision	0.0% ±0.4 pp · low precision	1.6%	3.1%
Moved from a different state	33 ±56 · low precision	1.0% ±1.7 pp · low precision	3.5%	2.3%
Moved from abroad	0 ±14 · low precision	0.0% ±0.4 pp · low precision	0.7%	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

0.9% of St. Johns residents (±1.8 percentage points) had no health insurance coverage when surveyed, compared with 10.5% in Arizona and 8.4% nationally. 82.7% 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	St. Johns	Arizona	U.S.	Compared with Arizona
People without health insurance Civilian noninstitutionalized population	0.9% ±1.8 pp · low precision	10.5%	8.4%	Lower
Households with a broadband subscription Households	82.7% ±24.3 pp	91.5%	91.0%	Not statistically different
Veterans Civilian population age 18 and older	0.3% ±0.5 pp · low precision	7.9%	6.2%	Lower

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 St. Johns . 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 St. Johns housing and cost context or return to the city profile.