Zip code 21757: Keymar, Maryland

Q: What city is zip code 21757?

21757 is assigned to Keymar, Maryland. The city name is the one the Postal Service prefers for mail addressed to this zip code.

Q: What county is 21757 in?

21757 is mostly in Carroll County, but it extends into 1 other county.

Q: What is the population of 21757?

About 2,671 people live in 21757, according to the Census Bureau's American Community Survey.

Q: What is the median household income in 21757?

The median household income in 21757 is $100,500.

Q: What zip codes are near 21757?

The closest zip codes to 21757 are 21759, 21775, 21778, 21798, 21791.

Residential delivery areaCarroll CountyEastern Time

Population

2,671

Median household income

$101K

U.S. $81K

Median home value

$466K

U.S. $333K

Median rent

$1,408/mo

U.S. $1,413

Median age

37.8

U.S. 38.9

Land area

35 sq mi

76 people/sq mi

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

About 21757

21757 is a small-town zip code in Keymar, Maryland (Carroll County), covering 35 sq mi of land. About 2,671 people live here, or 76 per square mile. The median resident is 37.8 years old, compared with 38.9 nationally.

The median household earns $100,500 a year, 24% above the national median of $80,734. 1.7% of residents live below the poverty line (U.S.: 12.5%). A typical home is valued at $466,100, or 4.6 years of median household income (U.S.: 4.1 years), which makes homes about as affordable as the national average for local earners. 82% of occupied homes are lived in by their owners, and renters pay a median of $1,408 a month.

30% of adults hold a bachelor's degree or higher (U.S.: 36%). Commuters average 31.4 minutes each way, and 14% of workers work from home. The most common jobs among working residents are in construction and repair; office and administrative support; and management. 15% of them are self-employed (U.S.: 10%).

How 21757 compares

Sorted from highest to lowest national percentile

Self-employed workers15.2%
91st
U.S. 10% · MD 8.7%73rd of 444 in MD
Homeownership rate82.4%
84th
StrengthU.S. 65.2% · MD 67.6%213th of 441 in MD
Average commute31.4 min
80th
WeaknessU.S. 26.4 min · MD 31.1 min209th of 421 in MD
Median household income$100,500
72nd
U.S. $80,734 · MD $103,678227th of 414 in MD
Median home value$466,100
71st
U.S. $332,700 · MD $419,900158th of 421 in MD
Tech workers4.2%
71st
U.S. 3.8% · MD 6.4%249th of 444 in MD
Residents 65 and older18.9%
67th
U.S. 17.2% · MD 16.7%191st of 446 in MD
Median earnings per worker$54,375
66th
U.S. $49,666 · MD $61,200275th of 443 in MD
Per capita income$46,390
65th
U.S. $44,673 · MD $52,979264th of 446 in MD
Work from home14.1%
57th
U.S. 15.1% · MD 19.3%268th of 444 in MD
Median gross rent$1,408
51st
U.S. $1,413 · MD $1,705222nd of 338 in MD
Bachelor's degree or higher29.5%
45th
U.S. 35.7% · MD 43.4%288th of 445 in MD
Government workers12.6%
41st
U.S. 14.5% · MD 22.5%389th of 444 in MD
Median age37.8
40th
U.S. 38.9 · MD 39.4327th of 446 in MD
Broadband access90%
34th
U.S. 91% · MD 92.4%293rd of 441 in MD
Residents under 1820.3%
34th
U.S. 22% · MD 22.2%274th of 446 in MD
Housing vacancy5%
33rd
U.S. 10.1% · MD 7.7%233rd of 441 in MD
Veterans3.9%
25th
U.S. 6.2% · MD 6.8%375th of 446 in MD
Foreign-born residents4.3%
25th
U.S. 14.1% · MD 16.6%277th of 446 in MD
Unemployment rate3.2%
19th
StrengthU.S. 5.2% · MD 4.9%277th of 444 in MD
Population density76/sq mi
11th
U.S. 95/sq mi · MD 639/sq mi373rd of 446 in MD
Diversity index17.7
10th
U.S. 61.4 · MD 67.7368th of 446 in MD
Uninsured rate2.4%
8th
StrengthU.S. 8.4% · MD 6.3%306th of 444 in MD
Healthcare workers5.6%
6th
U.S. 9.7% · MD 9%332nd of 444 in MD
Population2,671
4th
U.S. 334,922,499 · MD 6,206,011286th of 446 in MD
Income inequality (Gini)0.341
2nd
StrengthU.S. 0.483 · MD 0.456367th of 438 in MD
Poverty rate1.7%
1st
StrengthU.S. 12.5% · MD 9.4%389th of 441 in MD
Rent-burdened renters7.8%
1st
StrengthU.S. 51.1% · MD 51.5%368th of 404 in MD

Measure	21757	Carroll	MD	U.S.	National percentile	Rank in MD
Self-employed workers	15.2%	9.2%	8.7%	10%	91st	73rd of 444
Homeownership rateStrength	82.4%	84.3%	67.6%	65.2%	84th	213th of 441
Average commuteWeakness	31.4 min	34.4 min	31.1 min	26.4 min	80th	209th of 421
Median household income	$100,500	$118,211	$103,678	$80,734	72nd	227th of 414
Median home value	$466,100	$434,000	$419,900	$332,700	71st	158th of 421
Tech workers	4.2%	5.1%	6.4%	3.8%	71st	249th of 444
Residents 65 and older	18.9%	17.9%	16.7%	17.2%	67th	191st of 446
Median earnings per worker	$54,375	$65,314	$61,200	$49,666	66th	275th of 443
Per capita income	$46,390	$53,124	$52,979	$44,673	65th	264th of 446
Work from home	14.1%	17.3%	19.3%	15.1%	57th	268th of 444
Median gross rent	$1,408	$1,427	$1,705	$1,413	51st	222nd of 338
Bachelor's degree or higher	29.5%	40.7%	43.4%	35.7%	45th	288th of 445
Government workers	12.6%	19.7%	22.5%	14.5%	41st	389th of 444
Median age	37.8	41.3	39.4	38.9	40th	327th of 446
Broadband access	90%	92.5%	92.4%	91%	34th	293rd of 441
Residents under 18	20.3%	22%	22.2%	22%	34th	274th of 446
Housing vacancy	5%	3.7%	7.7%	10.1%	33rd	233rd of 441
Veterans	3.9%	7.5%	6.8%	6.2%	25th	375th of 446
Foreign-born residents	4.3%	5.5%	16.6%	14.1%	25th	277th of 446
Unemployment rateStrength	3.2%	3.5%	4.9%	5.2%	19th	277th of 444
Population density	76/sq mi	392/sq mi	639/sq mi	95/sq mi	11th	373rd of 446
Diversity index	17.7	28.1	67.7	61.4	10th	368th of 446
Uninsured rateStrength	2.4%	2.9%	6.3%	8.4%	8th	306th of 444
Healthcare workers	5.6%	8.7%	9%	9.7%	6th	332nd of 444
Population	2,671	175,321	6,206,011	334,922,499	4th	286th of 446
Income inequality (Gini)Strength	0.341	0.403	0.456	0.483	2nd	367th of 438
Poverty rateStrength	1.7%	5.2%	9.4%	12.5%	1st	389th of 441
Rent-burdened rentersStrength	7.8%	49.1%	51.5%	51.1%	1st	368th of 404

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

Under 5

11%

5–17

18–24

16%

25–34

11%

35–44

11%

45–54

14%

55–64

11%

65–74

75+

Median age

37.8

Under 18

20.3%

65 and over

18.9%

Race and ethnicity

White91%
Black1%
Hispanic2%
Asian2%
Native American0.3%
Pacific Islander0%
Other0%
Multiracial3%

Diversity index

17.7

U.S. 61.4

Foreign-born

4.3%

U.S. 14.1%

Born in state

67.5%

Language spoken at home (households)

English only

96%

Spanish

Other Indo-European

Asian / Pacific

Other

Households

Households: 1,018
Average household size: 2.6
Family households: 71.5%
Married couples: 55.7%
Living alone: 21.2%
Veterans (of adults): 3.9%
Male / female: 55% / 45%

Income and poverty

Household income distribution

<$25k

$25–50k

13%

$50–75k

14%

$75–100k

19%

$100–150k

22%

$150–200k

16%

$200k+

13%

Median household income

21757

$100,500

Carroll Co.

$118,211

Maryland

$103,678

United States

$80,734

Per capita income

$46,390

U.S. $44,673

Poverty rate

1.7%

U.S. 12.5%

Households earning $150K+

29%

U.S. 23%

Income inequality (Gini)

0.341

U.S. 0.483

Housing

Median home value

21757

$466,100

Carroll Co.

$434,000

Maryland

$419,900

United States

$332,700

Median gross rent

21757

$1,408

Carroll Co.

$1,427

Maryland

$1,705

United States

$1,413

Types of housing

Single-family

94%

2–4 units

5–19 units

20+ units

Mobile home

0.7%

Boat, RV, van

Housing units: 1,072
Owner-occupied: 82.4%
Vacant: 5%
Median year built: 1962
Median rooms: 6.5
Renters paying 30%+ of income: 7.8%
Renters paying 50%+ of income: 0%
Home value to income: 4.6× (U.S. 4.1×)

Work and commute

How people get to work

Drove alone

79%

Carpooled

Transit

Walked

Bicycle

Worked from home

14%

Other

Commute time (one way)

<10 min

17%

10–19

23%

20–29

15%

30–44

22%

45–59

60+

19%

Average commute

31.4 min

U.S. 26.4 min

Unemployment

3.2%

U.S. 5.2%

In labor force

71.7%

U.S. 63.5%

Jobs and careers

What employed residents do, wherever they work

Occupations

Construction and repair

22%

Office and admin

15%

Management

12%

Transportation and moving

Business and finance

Healthcare

Education

Production

Computer and math

Engineering and science

Cleaning and personal care

Sales

Food service

Farming, fishing and forestry

Legal and social services

Police and fire

Arts, media and sports

Industries

Construction

17%

Agriculture and mining

11%

Health care and social assistance

11%

Manufacturing

10%

Transportation, warehousing and utilities

Professional and technical services

Retail

Other services

Finance, insurance and real estate

Education

Public administration

Restaurants and hotels

Arts and recreation

Wholesale

Admin, support and management

0.9%

Information

0.4%

Median earnings per worker

$54,375

U.S. $49,666

Self-employed

15.2%

U.S. 10%

Government workers

12.6%

U.S. 14.5%

Nonprofit workers

7.6%

U.S. 8.8%

Median earnings by type of work

Type of work	21757	U.S.
Management, business, science and arts	$66,230	$74,888
Service	$42,750	$26,804
Sales and office	$34,583	$40,476
Construction and maintenance	$60,474	$49,199
Production and transportation	$50,638	$39,989

Education, internet and health coverage

Highest education (adults 25+)

No diploma

High school

38%

Some college

21%

Associate's

Bachelor's

16%

Graduate

13%

High school graduate or higher: 91.7%
Bachelor's degree or higher: 29.5%
Graduate or professional degree: 13.2%
Households with broadband: 90%
Cable, fiber or DSL: 49.9%
No internet access: 8.9%
Without health insurance: 2.4%
Limited-English households: 0%

Geography

City (USPS): Keymar
State: Maryland
County: Carroll County
Center point: 39.5939° N, 77.2581° W
Land area: 35 sq mi
Water area: 0.1 sq mi
Time zone: Eastern Time (UTC-5, UTC-4 in summer)
Zip type: Residential delivery area

21757 spans 2 counties

Carroll County52% of land
Frederick County48% of land

Zip codes near 21757

Search by radius

Zip	City	Distance	Population	IncomeMedian income	Home value
21759	Ladiesburg, MD · PO box	2.4 mi	—	—	—
21775	New Midway, MD · PO box	2.8 mi	—	—	—
21778	Rocky Ridge, MD	4 mi	745	$76,458	$382,100
21798	Woodsboro, MD	4.3 mi	2,928	$116,607	$498,400
21791	Union Bridge, MD	5.6 mi	5,340	$93,015	$379,800
21787	Taneytown, MD	7.4 mi	11,645	$91,682	$355,000
21727	Emmitsburg, MD	7.6 mi	6,052	$95,236	$331,100
21762	Libertytown, MD	7.8 mi	139	—	—
21788	Thurmont, MD	8.3 mi	11,654	$98,856	$379,200
21793	Walkersville, MD	8.6 mi	10,719	$121,971	$459,400
21792	Unionville, MD · PO box	9.1 mi	—	—	—
21776	New Windsor, MD	9.9 mi	6,261	$133,409	$461,600

Zip codes like 21757 elsewhere

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

Questions about 21757

What city is zip code 21757?

21757 is assigned to Keymar, Maryland. The city name is the one the Postal Service prefers for mail addressed to this zip code.

What county is 21757 in?

21757 is mostly in Carroll County, but it extends into 1 other county.

What is the population of 21757?

About 2,671 people live in 21757, according to the Census Bureau's American Community Survey.

What time zone is 21757 in?

21757 is in Eastern Time.

What is the median household income in 21757?

The median household income in 21757 is $100,500.

What zip codes are near 21757?

The closest zip codes to 21757 are 21759, 21775, 21778, 21798, 21791.

Demographic figures are 2020–2024 American Community Survey 5-year estimates for ZIP Code Tabulation Area 21757, from the U.S. Census Bureau. Small areas have wide margins of error. How we build these numbers.