Zip code 21723: Cooksville, Maryland

Q: What city is zip code 21723?

21723 is assigned to Cooksville, Maryland. The city name is the one the Postal Service prefers for mail addressed to this zip code.

Q: What county is 21723 in?

21723 is in Howard County, Maryland.

Q: What is the population of 21723?

About 669 people live in 21723, according to the Census Bureau's American Community Survey.

Q: What is the median household income in 21723?

The median household income in 21723 is $241,250.

Q: What zip codes are near 21723?

The closest zip codes to 21723 are 21794, 21797, 21738, 21765, 21104.

Residential delivery areaHoward CountyEastern Time

Population

669

Median household income

$241K

U.S. $81K

Median home value

$1M

U.S. $333K

Median rent

—

U.S. $1,413

Median age

48.3

U.S. 38.9

Land area

3.6 sq mi

186 people/sq mi

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

About 21723

21723 is a small-town zip code in Cooksville, Maryland (Howard County), covering 3.6 sq mi of land. About 669 people live here, or 186 per square mile. The median resident is 48.3 years old, compared with 38.9 nationally.

The median household earns $241,250 a year, about 3.0× the national median of $80,734. 0% of residents live below the poverty line (U.S.: 12.5%). A typical home is valued at $1,005,500, or 4.2 years of median household income (U.S.: 4.1 years), which makes homes about as affordable as the national average for local earners. 95% of occupied homes are lived in by their owners.

82% of adults hold a bachelor's degree or higher (U.S.: 36%). Commuters average 36.9 minutes each way, and 17% of workers work from home. The most common jobs among working residents are in cleaning and personal care; computer and math (tech); and management. 22% of them are self-employed (U.S.: 10%). 57% of households speak a language other than English at home, most often an Asian or Pacific Island language.

How 21723 compares

Sorted from highest to lowest national percentile

Median household income$241,250
99th
StrengthU.S. $80,734 · MD $103,67811th of 414 in MD
Bachelor's degree or higher82.3%
99th
StrengthU.S. 35.7% · MD 43.4%14th of 445 in MD
Homeownership rate95.3%
99th
StrengthU.S. 65.2% · MD 67.6%61st of 441 in MD
Broadband access100%
99th
StrengthU.S. 91% · MD 92.4%24th of 441 in MD
Rent-burdened renters100%
99th
WeaknessU.S. 51.1% · MD 51.5%17th of 404 in MD
Median earnings per worker$130,759
99th
StrengthU.S. $49,666 · MD $61,2009th of 443 in MD
Tech workers20.8%
99th
U.S. 3.8% · MD 6.4%6th of 444 in MD
Self-employed workers22.3%
99th
U.S. 10% · MD 8.7%30th of 444 in MD
Foreign-born residents44.7%
97th
U.S. 14.1% · MD 16.6%5th of 446 in MD
Government workers26.8%
96th
U.S. 14.5% · MD 22.5%112th of 444 in MD
Median home value$1,005,500
95th
U.S. $332,700 · MD $419,90010th of 421 in MD
Average commute36.9 min
94th
WeaknessU.S. 26.4 min · MD 31.1 min86th of 421 in MD
Per capita income$72,952
93rd
StrengthU.S. $44,673 · MD $52,97954th of 446 in MD
Median age48.3
93rd
U.S. 38.9 · MD 39.496th of 446 in MD
Diversity index65.5
84th
U.S. 61.4 · MD 67.762nd of 446 in MD
Work from home17%
69th
U.S. 15.1% · MD 19.3%212th of 444 in MD
Veterans6.8%
63rd
U.S. 6.2% · MD 6.8%243rd of 446 in MD
Healthcare workers9.8%
55th
U.S. 9.7% · MD 9%149th of 444 in MD
Residents under 1820.8%
38th
U.S. 22% · MD 22.2%255th of 446 in MD
Uninsured rate5.4%
37th
U.S. 8.4% · MD 6.3%140th of 444 in MD
Population density186/sq mi
20th
U.S. 95/sq mi · MD 639/sq mi302nd of 446 in MD
Residents 65 and older10%
8th
U.S. 17.2% · MD 16.7%405th of 446 in MD
Population669
1st
U.S. 334,922,499 · MD 6,206,011376th of 446 in MD
Poverty rate0%
1st
StrengthU.S. 12.5% · MD 9.4%433rd of 441 in MD
Unemployment rate0%
1st
StrengthU.S. 5.2% · MD 4.9%419th of 444 in MD
Housing vacancy0%
1st
U.S. 10.1% · MD 7.7%427th of 441 in MD
Income inequality (Gini)0.329
1st
StrengthU.S. 0.483 · MD 0.456381st of 438 in MD

Measure	21723	Howard	MD	U.S.	National percentile	Rank in MD
Median household incomeStrength	$241,250	$149,763	$103,678	$80,734	99th	11th of 414
Bachelor's degree or higherStrength	82.3%	64.5%	43.4%	35.7%	99th	14th of 445
Homeownership rateStrength	95.3%	71.5%	67.6%	65.2%	99th	61st of 441
Broadband accessStrength	100%	96.6%	92.4%	91%	99th	24th of 441
Rent-burdened rentersWeakness	100%	47.7%	51.5%	51.1%	99th	17th of 404
Median earnings per workerStrength	$130,759	$83,801	$61,200	$49,666	99th	9th of 443
Tech workers	20.8%	11.9%	6.4%	3.8%	99th	6th of 444
Self-employed workers	22.3%	9.2%	8.7%	10%	99th	30th of 444
Foreign-born residents	44.7%	22.8%	16.6%	14.1%	97th	5th of 446
Government workers	26.8%	22.9%	22.5%	14.5%	96th	112th of 444
Median home value	$1,005,500	$597,900	$419,900	$332,700	95th	10th of 421
Average commuteWeakness	36.9 min	28.5 min	31.1 min	26.4 min	94th	86th of 421
Per capita incomeStrength	$72,952	$67,501	$52,979	$44,673	93rd	54th of 446
Median age	48.3	39.8	39.4	38.9	93rd	96th of 446
Diversity index	65.5	70.3	67.7	61.4	84th	62nd of 446
Work from home	17%	26%	19.3%	15.1%	69th	212th of 444
Veterans	6.8%	6%	6.8%	6.2%	63rd	243rd of 446
Healthcare workers	9.8%	9.7%	9%	9.7%	55th	149th of 444
Residents under 18	20.8%	23.8%	22.2%	22%	38th	255th of 446
Uninsured rate	5.4%	4.2%	6.3%	8.4%	37th	140th of 444
Population density	186/sq mi	1,340/sq mi	639/sq mi	95/sq mi	20th	302nd of 446
Residents 65 and older	10%	15.2%	16.7%	17.2%	8th	405th of 446
Population	669	336,328	6,206,011	334,922,499	1st	376th of 446
Poverty rateStrength	0%	5.2%	9.4%	12.5%	1st	433rd of 441
Unemployment rateStrength	0%	3.5%	4.9%	5.2%	1st	419th of 444
Housing vacancy	0%	3.4%	7.7%	10.1%	1st	427th of 441
Income inequality (Gini)Strength	0.329	0.414	0.456	0.483	1st	381st of 438

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

21%

5–17

18–24

25–34

16%

35–44

26%

45–54

16%

55–64

65–74

75+

Median age

48.3

Under 18

20.8%

65 and over

10%

Race and ethnicity

White32%
Black15%
Hispanic0%
Asian47%
Native American0%
Pacific Islander0%
Other3%
Multiracial4%

Diversity index

65.5

U.S. 61.4

Foreign-born

44.7%

U.S. 14.1%

Born in state

32.9%

Language spoken at home (households)

English only

44%

Spanish

Other Indo-European

Asian / Pacific

48%

Other

Households

Households: 232
Average household size: 2.9
Family households: 95.3%
Married couples: 91.8%
Living alone: 4.7%
Veterans (of adults): 6.8%
Male / female: 44% / 56%

Income and poverty

Household income distribution

<$25k

$25–50k

$50–75k

20%

$75–100k

$100–150k

10%

$150–200k

$200k+

54%

Median household income

21723

$241,250

Howard Co.

$149,763

Maryland

$103,678

United States

$80,734

Per capita income

$72,952

U.S. $44,673

Poverty rate

U.S. 12.5%

Households earning $150K+

58.6%

U.S. 23%

Income inequality (Gini)

0.329

U.S. 0.483

Housing

Median home value

21723

$1,005,500

Howard Co.

$597,900

Maryland

$419,900

United States

$332,700

Median gross rent

21723

—

Howard Co.

$2,099

Maryland

$1,705

United States

$1,413

Types of housing

Single-family

100%

2–4 units

5–19 units

20+ units

Mobile home

Boat, RV, van

Housing units: 232
Owner-occupied: 95.3%
Vacant: 0%
Median year built: 2002
Median rooms: 9 or more
Renters paying 30%+ of income: 100%
Renters paying 50%+ of income: 100%
Home value to income: 4.2× (U.S. 4.1×)

Work and commute

How people get to work

Drove alone

79%

Carpooled

Transit

Walked

Bicycle

Worked from home

17%

Other

Commute time (one way)

<10 min

10–19

20–29

24%

30–44

42%

45–59

20%

60+

11%

Average commute

36.9 min

U.S. 26.4 min

Unemployment

U.S. 5.2%

In labor force

72.5%

U.S. 63.5%

Jobs and careers

What employed residents do, wherever they work

Occupations

Cleaning and personal care

23%

Computer and math

21%

Management

13%

Healthcare

10%

Engineering and science

Sales

Business and finance

Food service

Arts, media and sports

Construction and repair

Office and admin

Education

Transportation and moving

Legal and social services

Police and fire

Farming, fishing and forestry

Production

Industries

Professional and technical services

31%

Admin, support and management

23%

Public administration

14%

Health care and social assistance

Construction

Retail

Education

Restaurants and hotels

Finance, insurance and real estate

Manufacturing

Transportation, warehousing and utilities

Other services

Wholesale

Information

Arts and recreation

Agriculture and mining

Median earnings per worker

$130,759

U.S. $49,666

Self-employed

22.3%

U.S. 10%

Government workers

26.8%

U.S. 14.5%

Nonprofit workers

U.S. 8.8%

Median earnings by type of work

Type of work	21723	U.S.
Management, business, science and arts	$163,594	$74,888
Service	$22,092	$26,804
Sales and office	$42,125	$40,476
Construction and maintenance	—	$49,199
Production and transportation	—	$39,989

Education, internet and health coverage

Highest education (adults 25+)

No diploma

High school

Some college

10%

Associate's

Bachelor's

46%

Graduate

36%

High school graduate or higher: 100%
Bachelor's degree or higher: 82.3%
Graduate or professional degree: 35.8%
Households with broadband: 100%
Cable, fiber or DSL: 94.4%
No internet access: 0%
Without health insurance: 5.4%
Limited-English households: 0%

Geography

City (USPS): Cooksville
State: Maryland
County: Howard County
Center point: 39.3291° N, 77.0026° W
Land area: 3.6 sq mi
Water area: under 0.1 sq mi
Time zone: Eastern Time (UTC-5, UTC-4 in summer)
Zip type: Residential delivery area

Zip codes near 21723

Search by radius

Zip	City	Distance	Population	IncomeMedian income	Home value
21794	West Friendship, MD	2.9 mi	2,192	$231,466	$999,400
21797	Woodbine, MD	3.5 mi	8,643	$189,241	$735,600
21738	Glenwood, MD	3.6 mi	3,696	$250,000+	$914,300
21765	Lisbon, MD · PO box	3.8 mi	—	—	—
21104	Marriottsville, MD	5 mi	6,052	$191,804	$680,200
21784	Sykesville, MD	5.2 mi	39,258	$139,395	$491,800
21737	Glenelg, MD	5.7 mi	2,474	$250,000+	$996,400
21036	Dayton, MD	6.5 mi	2,569	$218,036	$881,300
21042	Ellicott City, MD	6.8 mi	43,327	$190,061	$706,400
21041	Ellicott City, MD · PO box	7.2 mi	—	—	—
21150	Simpsonville, MD · PO box	7.2 mi	—	—	—
21163	Woodstock, MD	8.3 mi	7,539	$134,672	$602,800

Questions about 21723

What city is zip code 21723?

21723 is assigned to Cooksville, Maryland. The city name is the one the Postal Service prefers for mail addressed to this zip code.

What county is 21723 in?

21723 is in Howard County, Maryland.

What is the population of 21723?

About 669 people live in 21723, according to the Census Bureau's American Community Survey.

What time zone is 21723 in?

21723 is in Eastern Time.

What is the median household income in 21723?

The median household income in 21723 is $241,250.

What zip codes are near 21723?

The closest zip codes to 21723 are 21794, 21797, 21738, 21765, 21104.

Demographic figures are 2020–2024 American Community Survey 5-year estimates for ZIP Code Tabulation Area 21723, from the U.S. Census Bureau. Small areas have wide margins of error. How we build these numbers.