PlainZIP

Cooksville, MD · standard

ZIP Code 21723

Howard County, Maryland - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.

803
102/sq mi
$241,250
Median income
$1,005,500
Median home value
82.3%
Bachelor's or higher

The verdict

Cooksville pairs a top-decile household income with top-decile home values, in a rural, homeowner-dominated area.

Top 1%
household income, US ZIPs
Top 2%
home value, US ZIPs
102
people per sq mi
95%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 21723 against every reporting US ZIP.

ZIP code 21723 is a sparsely populated ZIP (a standard USPS delivery area) in Cooksville, Howard County, Maryland, home to just 803 residents across 7.9 square miles, a density of 102 people per square mile, in the New York time zone.

ZIP 21723 skews affluent, with a median household income of $241,250 (111% above the Maryland average), while per-capita income is $72,952. 0.0% of residents live below the poverty line, and the unemployment rate reads 0.0%. On housing, the median home value is $1,005,500 (125% above the state average) with median rent at - per month, and 95.3% of occupied units are owner-occupied.

This is a highly-educated ZIP: 82.3% of adults hold a bachelor's degree or higher, the median age is 48.3, and the average commute is -. A geography-based comparison follows: 10 ZIP codes within about 10 miles of 21723, plus 6 more within Howard County, give a clearer read than the national average alone.

Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →

Top industries in ZIP 21723

Top 5 sectors by establishment count in Cooksville, MD

Which industries have the most business establishments in ZIP 21723.

establishments

What this shows Establishment counts come from the Census ZIP Code Business Patterns program, which counts physical business locations rather than employees or revenue.

Source U.S. Census Bureau · ZIP Code Business Patterns (ZBP) As of 2023

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 21723, Cooksville, MD · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.

Quick Facts

803

Population

7.9

Area (sq mi)

102

People / sq mi

New York

Time Zone

standard

ZIP Type

Neighborhood Scorecard
Get an A-F grade across income, safety, housing, rent, education, commute, and childcare for this ZIP code.
View Scorecard →

Who lives in ZIP 21723?

48.3

Median Age

44.4%

Male

55.6%

Female

44.7%

Foreign-Born

White 31.8%
African American 14.9%
Asian 46.8%
American Indian or Alaska Native 0.0%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 3.9%
Hispanic or Latino 0.0%

Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How much do residents earn?

$241,250

Median Household Income

+111% vs state

$72,952

Per Capita Income

0.0%

Poverty Rate

0.0%

Unemployment Rate

How ZIP 21723 ranks nationally

Cooksville, MD household income vs. every US ZIP code

Median household income, the full national distribution, with this ZIP marked

$241,250 Top 1% higher than 99% of 30,318 US ZIPs

$0–$20,000: 118 US ZIPs (0%). Below this entry. $20,000–$40,000: 1,573 US ZIPs (5%). Below this entry. $40,000–$60,000: 7,092 US ZIPs (23%). Below this entry. $60,000–$80,000: 9,980 US ZIPs (33%). Below this entry. $80,000–$100,000: 5,778 US ZIPs (19%). Below this entry. $100,000–$120,000: 2,855 US ZIPs (9%). Below this entry. $120,000–$140,000: 1,362 US ZIPs (4%). Below this entry. $140,000–$160,000: 686 US ZIPs (2%). Below this entry. $160,000–$180,000: 364 US ZIPs (1%). Below this entry. $180,000–$200,000: 186 US ZIPs (1%). Below this entry. $200,000–$220,000: 324 US ZIPs (1%). This entry sits in this band. This ZIP $0 $200K+ every reporting US ZIP, bucketed by value

Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What is the education profile here?

High School Graduate or Higher 90.2%
Bachelor's Degree or Higher 82.3%

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What does housing look like?

232

Total Housing Units

232

Occupied Units

0

Vacant Units

2.88

Avg Household Size

Occupancy Type

Owner 95.3%
Renter 4.7%

$1,005,500

Median Home Value

+125% vs state

2002

Median Year Built

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What businesses operate in this ZIP?

Census Bureau data shows 22 business establishments in ZIP 21723, employing approximately 145 people with a combined annual payroll of $4,941,000.

22

Businesses

145

Employees

$4.9M

Annual Payroll

3

Industry Sectors

Industry Establishments % of Total
Professional, scientific, and technical services 7 31.8%
Construction 3 13.6%
Retail trade 3 13.6%

Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.

Nearby ZIP Codes

Want a side-by-side? Compare 21723 vs 21738 →

ZIP 21723 vs its nearest neighbors, by population

Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.

residents

What this shows Among its immediate neighbors, ZIP 21723 ranks #0 by population - useful context the national average alone can't give.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023

ZIP 21723 vs its nearest neighbors, by median income

Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.

median income

What this shows By household income, ZIP 21723 ranks #3 of 9 neighboring ZIPs, local affluence varies block to block, not just metro to metro.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023
ZIP Code City Population Distance
21738 Glenwood, MD 3,268 3.2 mi
21794 West Friendship, MD 2,434 2.8 mi
21797 Woodbine, MD 8,839 3.2 mi
21737 Glenelg, MD 1,458 4.9 mi
21036 Dayton, MD 2,114 6.3 mi
21784 Sykesville, MD 37,941 5.6 mi
21104 Marriottsville, MD 4,601 5.8 mi
20862 Brinklow, MD 343 9.8 mi
20833 Brookeville, MD 7,735 8.6 mi
21042 Ellicott City, MD 38,076 7.4 mi

More ZIP Codes in Howard County

21043 standard
Ellicott City, MD
Pop: 42,246
21044 standard
Columbia, MD
Pop: 41,704
21045 standard
Columbia, MD
Pop: 38,288
21042 standard
Ellicott City, MD
Pop: 38,076
20723 standard
Laurel, MD
Pop: 28,972
21075 standard
Elkridge, MD
Pop: 26,344

Related Areas

Howard County Cooksville, MD Maryland

Frequently Asked Questions

What county is ZIP code 21723 in? ▼
ZIP code 21723 (Cooksville) is located in Howard County, Maryland. Howard County contains multiple ZIP codes, see the full list at /counties/howard-md.
What is the population of ZIP code 21723? ▼
ZIP code 21723 in Cooksville, MD has a population of 803 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 21723? ▼
The median household income in ZIP 21723 is $241,250, which is 216% above the national average of $76,288.
What is the average home value in ZIP 21723? ▼
The median home value in ZIP 21723 is $1,005,500, which is 261% above the national average of $278,155.
What is the demographic makeup of ZIP 21723? ▼
The largest racial group in ZIP 21723 is Asian at 46.8%.
How many businesses are in ZIP code 21723? ▼
ZIP code 21723 has 22 business establishments employing approximately 145 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 21723? ▼
The top industries by establishment count in ZIP 21723 are: Professional, scientific, and technical services (7), Construction (3), Retail trade (3). There are 3 industry sectors represented in total.
What is the education level in ZIP code 21723? ▼
In ZIP code 21723, 90.2% of residents aged 25+ have a high school diploma or higher, and 82.3% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What percentage of residents own vs. rent in ZIP 21723? ▼
In ZIP code 21723, approximately 95.3% of occupied housing units are owner-occupied and 4.7% are renter-occupied, based on Census ACS 2023 data.

Read our methodology to see how this data is sourced, computed, and verified.