Zip code 21758: Knoxville, Maryland

Q: What city is zip code 21758?

21758 is assigned to Knoxville, Maryland. The city name is the one the Postal Service prefers for mail addressed to this zip code.

Q: What county is 21758 in?

21758 is mostly in Frederick County, but it extends into 1 other county.

Q: What is the population of 21758?

About 4,409 people live in 21758, according to the Census Bureau's American Community Survey.

Q: What is the median household income in 21758?

The median household income in 21758 is $111,528.

Q: What zip codes are near 21758?

The closest zip codes to 21758 are 21715, 21716, 21718, 21755, 21779.

Residential delivery areaFrederick CountyEastern Time

Population

4,409

Median household income

$112K

U.S. $81K

Median home value

$425K

U.S. $333K

Median rent

$1,770/mo

U.S. $1,413

Median age

U.S. 38.9

Land area

32 sq mi

138 people/sq mi

Boundary is the Census Bureau's ZIP Code Tabulation Area, which closely tracks the postal delivery area.

About 21758

21758 is a small-town zip code in Knoxville, Maryland (Frederick County), covering 32 sq mi of land. About 4,409 people live here, or 138 per square mile. The median resident is 39 years old, compared with 38.9 nationally.

The median household earns $111,528 a year, 38% above the national median of $80,734. 5.9% of residents live below the poverty line (U.S.: 12.5%). A typical home is valued at $424,600, or 3.8 years of median household income (U.S.: 4.1 years), which makes homes about as affordable as the national average for local earners. 84% of occupied homes are lived in by their owners, and renters pay a median of $1,770 a month.

44% of adults hold a bachelor's degree or higher (U.S.: 36%). Commuters average 36.1 minutes each way, and 26% of workers work from home. The most common jobs among working residents are in management; office and administrative support; and production and manufacturing.

How 21758 compares

Sorted from highest to lowest national percentile

Tech workers8.4%
94th
U.S. 3.8% · MD 6.4%90th of 444 in MD
Average commute36.1 min
93rd
WeaknessU.S. 26.4 min · MD 31.1 min98th of 421 in MD
Work from home25.6%
89th
U.S. 15.1% · MD 19.3%77th of 444 in MD
Unemployment rate8.5%
89th
WeaknessU.S. 5.2% · MD 4.9%42nd of 444 in MD
Homeownership rate84.4%
88th
StrengthU.S. 65.2% · MD 67.6%191st of 441 in MD
Median earnings per worker$68,067
85th
StrengthU.S. $49,666 · MD $61,200177th of 443 in MD
Government workers20%
84th
U.S. 14.5% · MD 22.5%259th of 444 in MD
Median household income$111,528
80th
StrengthU.S. $80,734 · MD $103,678192nd of 414 in MD
Per capita income$50,488
73rd
U.S. $44,673 · MD $52,979232nd of 446 in MD
Median gross rent$1,770
72nd
U.S. $1,413 · MD $1,705128th of 338 in MD
Bachelor's degree or higher43.7%
71st
U.S. 35.7% · MD 43.4%171st of 445 in MD
Residents under 1824.2%
68th
U.S. 22% · MD 22.2%123rd of 446 in MD
Median home value$424,600
66th
U.S. $332,700 · MD $419,900210th of 421 in MD
Veterans6.9%
65th
U.S. 6.2% · MD 6.8%234th of 446 in MD
Residents 65 and older17.7%
58th
U.S. 17.2% · MD 16.7%230th of 446 in MD
Uninsured rate7.3%
54th
U.S. 8.4% · MD 6.3%79th of 444 in MD
Rent-burdened renters51.2%
52nd
U.S. 51.1% · MD 51.5%181st of 404 in MD
Median age39
50th
U.S. 38.9 · MD 39.4294th of 446 in MD
Healthcare workers9.4%
49th
U.S. 9.7% · MD 9%163rd of 444 in MD
Foreign-born residents7.9%
42nd
U.S. 14.1% · MD 16.6%195th of 446 in MD
Diversity index33
27th
U.S. 61.4 · MD 67.7281st of 446 in MD
Poverty rate5.9%
18th
StrengthU.S. 12.5% · MD 9.4%244th of 441 in MD
Population density138/sq mi
17th
U.S. 95/sq mi · MD 639/sq mi324th of 446 in MD
Broadband access84.8%
12th
WeaknessU.S. 91% · MD 92.4%372nd of 441 in MD
Income inequality (Gini)0.381
10th
StrengthU.S. 0.483 · MD 0.456292nd of 438 in MD
Self-employed workers5.8%
8th
U.S. 10% · MD 8.7%353rd of 444 in MD
Population4,409
7th
U.S. 334,922,499 · MD 6,206,011248th of 446 in MD
Housing vacancy2.3%
5th
U.S. 10.1% · MD 7.7%346th of 441 in MD

Measure	21758	Frederick	MD	U.S.	National percentile	Rank in MD
Tech workers	8.4%	6.8%	6.4%	3.8%	94th	90th of 444
Average commuteWeakness	36.1 min	33.1 min	31.1 min	26.4 min	93rd	98th of 421
Work from home	25.6%	21.2%	19.3%	15.1%	89th	77th of 444
Unemployment rateWeakness	8.5%	3.3%	4.9%	5.2%	89th	42nd of 444
Homeownership rateStrength	84.4%	77%	67.6%	65.2%	88th	191st of 441
Median earnings per workerStrength	$68,067	$67,763	$61,200	$49,666	85th	177th of 443
Government workers	20%	21.4%	22.5%	14.5%	84th	259th of 444
Median household incomeStrength	$111,528	$122,002	$103,678	$80,734	80th	192nd of 414
Per capita income	$50,488	$54,982	$52,979	$44,673	73rd	232nd of 446
Median gross rent	$1,770	$1,774	$1,705	$1,413	72nd	128th of 338
Bachelor's degree or higher	43.7%	45.8%	43.4%	35.7%	71st	171st of 445
Residents under 18	24.2%	23.3%	22.2%	22%	68th	123rd of 446
Median home value	$424,600	$464,600	$419,900	$332,700	66th	210th of 421
Veterans	6.9%	7.5%	6.8%	6.2%	65th	234th of 446
Residents 65 and older	17.7%	15.3%	16.7%	17.2%	58th	230th of 446
Uninsured rate	7.3%	4.7%	6.3%	8.4%	54th	79th of 444
Rent-burdened renters	51.2%	48.5%	51.5%	51.1%	52nd	181st of 404
Median age	39	39	39.4	38.9	50th	294th of 446
Healthcare workers	9.4%	7.8%	9%	9.7%	49th	163rd of 444
Foreign-born residents	7.9%	13.8%	16.6%	14.1%	42nd	195th of 446
Diversity index	33	53.6	67.7	61.4	27th	281st of 446
Poverty rateStrength	5.9%	6%	9.4%	12.5%	18th	244th of 441
Population density	138/sq mi	435/sq mi	639/sq mi	95/sq mi	17th	324th of 446
Broadband accessWeakness	84.8%	93.2%	92.4%	91%	12th	372nd of 441
Income inequality (Gini)Strength	0.381	0.398	0.456	0.483	10th	292nd of 438
Self-employed workers	5.8%	8.2%	8.7%	10%	8th	353rd of 444
Population	4,409	287,048	6,206,011	334,922,499	7th	248th of 446
Housing vacancy	2.3%	3.9%	7.7%	10.1%	5th	346th of 441

The percentile is the share of Americans who live in a zip code with a lower value, so the 50th percentile is typical. Rank 1 is the highest value in the state. Both include zip codes with at least 100 residents. Strengths and weaknesses mark measures in the best or worst fifth nationally, where higher or lower is clearly better (income, poverty, education, commute, broadband, insurance and similar). Measures like age or density are left unmarked.

People

Age

11%

Under 5

14%

5–17

18–24

15%

25–34

11%

35–44

15%

45–54

12%

55–64

11%

65–74

75+

Median age

Under 18

24.2%

65 and over

17.7%

Race and ethnicity

White81%
Black3%
Hispanic9%
Asian2%
Native American0.0%
Pacific Islander0%
Other0%
Multiracial5%

Diversity index

U.S. 61.4

Foreign-born

7.9%

U.S. 14.1%

Born in state

46%

Language spoken at home (households)

English only

90%

Spanish

Other Indo-European

Asian / Pacific

Other

Households

Households: 1,588
Average household size: 2.8
Family households: 70.7%
Married couples: 61%
Living alone: 20.2%
Veterans (of adults): 6.9%
Male / female: 51% / 49%

Income and poverty

Household income distribution

<$25k

10%

$25–50k

$50–75k

15%

$75–100k

13%

$100–150k

23%

$150–200k

18%

$200k+

17%

Median household income

21758

$111,528

Frederick Co.

$122,002

Maryland

$103,678

United States

$80,734

Per capita income

$50,488

U.S. $44,673

Poverty rate

5.9%

U.S. 12.5%

Households earning $150K+

35.7%

U.S. 23%

Income inequality (Gini)

0.381

U.S. 0.483

Housing

Median home value

21758

$424,600

Frederick Co.

$464,600

Maryland

$419,900

United States

$332,700

Median gross rent

21758

$1,770

Frederick Co.

$1,774

Maryland

$1,705

United States

$1,413

Types of housing

Single-family

99%

2–4 units

5–19 units

20+ units

Mobile home

Boat, RV, van

Housing units: 1,626
Owner-occupied: 84.4%
Vacant: 2.3%
Median year built: 1979
Median rooms: 6.9
Renters paying 30%+ of income: 51.2%
Renters paying 50%+ of income: 6%
Home value to income: 3.8× (U.S. 4.1×)

Work and commute

How people get to work

Drove alone

67%

Carpooled

Transit

Walked

0.6%

Bicycle

Worked from home

26%

Other

0.5%

Commute time (one way)

<10 min

10–19

12%

20–29

20%

30–44

27%

45–59

11%

60+

23%

Average commute

36.1 min

U.S. 26.4 min

Unemployment

8.5%

U.S. 5.2%

In labor force

70.8%

U.S. 63.5%

Jobs and careers

What employed residents do, wherever they work

Occupations

Management

17%

Office and admin

10%

Production

Healthcare

Construction and repair

Computer and math

Sales

Food service

Business and finance

Transportation and moving

Education

Legal and social services

Cleaning and personal care

Police and fire

Engineering and science

Arts, media and sports

0.9%

Farming, fishing and forestry

Industries

Professional and technical services

15%

Public administration

13%

Health care and social assistance

11%

Retail

10%

Other services

Restaurants and hotels

Education

Construction

Finance, insurance and real estate

Manufacturing

Wholesale

Agriculture and mining

Information

Transportation, warehousing and utilities

Admin, support and management

Arts and recreation

0.7%

Median earnings per worker

$68,067

U.S. $49,666

Self-employed

5.8%

U.S. 10%

Government workers

20%

U.S. 14.5%

Nonprofit workers

13.2%

U.S. 8.8%

Median earnings by type of work

Type of work	21758	U.S.
Management, business, science and arts	$89,122	$74,888
Service	$27,840	$26,804
Sales and office	$45,987	$40,476
Construction and maintenance	$70,000	$49,199
Production and transportation	$54,216	$39,989

Education, internet and health coverage

Highest education (adults 25+)

No diploma

High school

34%

Some college

10%

Associate's

Bachelor's

22%

Graduate

22%

High school graduate or higher: 95.1%
Bachelor's degree or higher: 43.7%
Graduate or professional degree: 21.5%
Households with broadband: 84.8%
Cable, fiber or DSL: 73.6%
No internet access: 13.7%
Without health insurance: 7.3%
Limited-English households: 0%

Geography

City (USPS): Knoxville
State: Maryland
County: Frederick County
Center point: 39.3532° N, 77.6568° W
Land area: 32 sq mi
Water area: 2.8 sq mi
Time zone: Eastern Time (UTC-5, UTC-4 in summer)
Zip type: Residential delivery area

21758 spans 2 counties

Frederick County50% of land
Washington County50% of land

Cities and towns within this zip

Garretts Mill (unincorporated)2% of zip
Brunswick2% of zip
Rosemont2% of zip

Census places overlapping the zip's area. Mail may use a different city name than the municipality.

Zip codes near 21758

Search by radius

Zip	City	Distance	Population	IncomeMedian income	Home value
21715	Brownsville, MD	1.8 mi	20	—	—
21716	Brunswick, MD	2.9 mi	7,200	$109,382	$361,300
21718	Burkittsville, MD	3.2 mi	134	$93,500	$576,400
21755	Jefferson, MD	4.8 mi	5,909	$137,417	$529,600
21779	Rohrersville, MD	4.9 mi	1,311	—	$608,800
20180	Lovettsville, VA	5.9 mi	7,531	$151,483	$664,400
25425	Harpers Ferry, WV	7 mi	13,332	$94,048	$341,200
21756	Keedysville, MD	7.6 mi	3,640	$101,786	$413,200
21769	Middletown, MD	7.8 mi	11,965	$151,563	$507,000
25423	Halltown, WV · PO box	8 mi	—	—	—
25432	Millville, WV	8 mi	120	$46,397	$191,100
21777	Point Of Rocks, MD	8.5 mi	2,462	$159,708	$480,500

Zip codes like 21758 elsewhere

Matched on income, home values, age, density, education, housing and commuting

Questions about 21758

What city is zip code 21758?

21758 is assigned to Knoxville, Maryland. The city name is the one the Postal Service prefers for mail addressed to this zip code.

What county is 21758 in?

21758 is mostly in Frederick County, but it extends into 1 other county.

What is the population of 21758?

About 4,409 people live in 21758, according to the Census Bureau's American Community Survey.

What time zone is 21758 in?

21758 is in Eastern Time.

What is the median household income in 21758?

The median household income in 21758 is $111,528.

What zip codes are near 21758?

The closest zip codes to 21758 are 21715, 21716, 21718, 21755, 21779.

Demographic figures are 2020–2024 American Community Survey 5-year estimates for ZIP Code Tabulation Area 21758, from the U.S. Census Bureau. Small areas have wide margins of error. How we build these numbers.