Flagstaff, Arizona demographics

Flagstaff, AZ demographics: median age 25.9; 52.3% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Flagstaff city, Arizona · Incorporated city · GEOID 0423620. The survey estimates a population of 76,445 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Flagstaff is 25.9 years, with a 90% margin of error of 0.6 years. There are 28,550 households (±628). 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	25.9 ±0.6	39.0 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 76,445
Category	Count ± MOE	Share ± MOE (pp)	Arizona	U.S.
Under 18	13,233 ±739	17.3% ±1.0 pp	21.6%	22.0%
18–34	35,524 ±1,350	46.5% ±1.8 pp	23.2%	22.8%
35–64	20,566 ±974	26.9% ±1.3 pp	36.2%	38.0%
65 and older	7,122 ±554	9.3% ±0.7 pp	18.9%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 76,445
Category	Count ± MOE	Share ± MOE (pp)	Arizona	U.S.
Male	37,474 ±605	49.0% ±0.8 pp	49.9%	49.5%
Female	38,971 ±609	51.0% ±0.8 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: 76,445
Category	Count ± MOE	Share ± MOE (pp)	Arizona	U.S.
White alone	48,371 ±1,153	63.3% ±1.5 pp	59.0%	61.0%
Black or African American alone	1,408 ±287	1.8% ±0.4 pp	4.6%	12.2%
American Indian and Alaska Native alone	10,314 ±976	13.5% ±1.3 pp	4.0%	0.9%
Asian alone	1,911 ±359	2.5% ±0.5 pp	3.6%	6.0%
Native Hawaiian and Other Pacific Islander alone	123 ±63 · low precision	0.2% ±0.1 pp · low precision	0.2%	0.2%
Some other race alone	5,266 ±891	6.9% ±1.2 pp	9.1%	7.1%
Two or more races	9,052 ±1,063	11.8% ±1.4 pp	19.5%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 76,445
Category	Count ± MOE	Share ± MOE (pp)	Arizona	U.S.
Not Hispanic or Latino	61,442 ±679	80.4% ±0.9 pp	68.6%	80.7%
Hispanic or Latino	15,003 ±676	19.6% ±0.9 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: 28,550
Category	Count ± MOE	Share ± MOE (pp)	Arizona	U.S.
Married-couple family	10,086 ±493	35.3% ±1.5 pp	46.7%	46.9%
Other family: male householder, no spouse present	1,410 ±352	4.9% ±1.2 pp	5.6%	5.1%
Other family: female householder, no spouse present	2,775 ±381	9.7% ±1.3 pp	11.9%	12.2%
Nonfamily: householder living alone	8,261 ±810	28.9% ±2.8 pp	27.5%	28.7%
Nonfamily: householder not living alone	6,018 ±530	21.1% ±1.8 pp	8.2%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 28,550
Category	Count ± MOE	Share ± MOE (pp)	Arizona	U.S.
Households with people under 18	7,198 ±430	25.2% ±1.4 pp	28.7%	29.5%
Households without people under 18	21,352 ±765	74.8% ±2.1 pp	71.3%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 28,550
Category	Count ± MOE	Share ± MOE (pp)	Arizona	U.S.
One-person nonfamily households	8,261 ±810	28.9% ±2.8 pp	27.5%	28.7%
Two-person households	10,268 ±718	36.0% ±2.4 pp	35.6%	33.8%
Three-person households	4,257 ±521	14.9% ±1.8 pp	14.3%	15.3%
Four-person households	4,139 ±438	14.5% ±1.5 pp	11.8%	12.6%
Five-person households	1,068 ±271	3.7% ±0.9 pp	6.1%	5.9%
Six-person households	241 ±93	0.8% ±0.3 pp	2.8%	2.2%
Seven or more people	316 ±122	1.1% ±0.4 pp	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: 76,445
Category	Count ± MOE	Share ± MOE (pp)	Arizona	U.S.
Native	71,894 ±630	94.0% ±0.8 pp	87.0%	85.9%
Foreign born	4,551 ±637	6.0% ±0.8 pp	13.0%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 73,069
Category	Count ± MOE	Share ± MOE (pp)	Arizona	U.S.
English only	61,020 ±1,124	83.5% ±1.5 pp	74.3%	77.7%
Spanish	6,408 ±793	8.8% ±1.1 pp	19.3%	13.6%
French, Haitian, or Cajun	282 ±179 · low precision	0.4% ±0.2 pp · low precision	0.3%	0.7%
German or other West Germanic	373 ±275 · low precision	0.5% ±0.4 pp · low precision	0.3%	0.5%
Russian, Polish, or other Slavic	247 ±133 · low precision	0.3% ±0.2 pp · low precision	0.4%	0.7%
Other Indo-European	450 ±166	0.6% ±0.2 pp	1.1%	2.0%
Korean	181 ±131 · low precision	0.2% ±0.2 pp · low precision	0.2%	0.3%
Chinese, including Mandarin and Cantonese	268 ±135 · low precision	0.4% ±0.2 pp · low precision	0.5%	1.1%
Vietnamese	64 ±66 · low precision	0.1% ±0.1 pp · low precision	0.3%	0.5%
Tagalog, including Filipino	49 ±41 · low precision	0.1% ±0.1 pp · low precision	0.4%	0.6%
Other Asian and Pacific Island	168 ±113 · low precision	0.2% ±0.2 pp · low precision	0.7%	1.1%
Arabic	125 ±140 · low precision	0.2% ±0.2 pp · low precision	0.4%	0.5%
Other and unspecified	3,434 ±690	4.7% ±0.9 pp	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: 39,889
Category	Count ± MOE	Share ± MOE (pp)	Arizona	U.S.
Less than high school graduate	1,616 ±334	4.1% ±0.8 pp	10.6%	10.4%
High school graduate or equivalency	6,088 ±637	15.3% ±1.6 pp	23.5%	26.0%
Some college, no degree	8,227 ±800	20.6% ±2.0 pp	23.3%	19.1%
Associate’s degree	3,097 ±436	7.8% ±1.1 pp	9.3%	8.8%
Bachelor’s degree	12,216 ±777	30.6% ±1.9 pp	20.3%	21.6%
Graduate or professional degree	8,645 ±678	21.7% ±1.7 pp	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: 75,916
Category	Count ± MOE	Share ± MOE (pp)	Arizona	U.S.
Same house	53,005 ±1,359	69.8% ±1.8 pp	85.7%	87.7%
Moved within same county	8,549 ±1,073	11.3% ±1.4 pp	8.5%	6.3%
Moved from a different county in the same state	8,611 ±769	11.3% ±1.0 pp	1.6%	3.1%
Moved from a different state	5,039 ±1,027	6.6% ±1.4 pp	3.5%	2.3%
Moved from abroad	712 ±272	0.9% ±0.4 pp	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

10.5% of Flagstaff residents (±1.2 percentage points) had no health insurance coverage when surveyed, compared with 10.5% in Arizona and 8.4% nationally. 88.7% 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	Flagstaff	Arizona	U.S.	Compared with Arizona
People without health insurance Civilian noninstitutionalized population	10.5% ±1.2 pp	10.5%	8.4%	Not statistically different
Households with a broadband subscription Households	88.7% ±1.2 pp	91.5%	91.0%	Lower
Veterans Civilian population age 18 and older	4.6% ±0.7 pp	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 Flagstaff . 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 Flagstaff housing and cost context or return to the city profile.