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 Moderate-density area
- $241,250
- Median income Above-median income area
- $1,005,500
- Median home value Above-median home value
- 82.3%
- Bachelor's or higher Above-average bachelor's attainment
National ZIP placement
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 average Maryland ZIP), while per-capita income is $72,952. Both reported hardship measures are comparatively low in absolute terms: poverty is 0.0% and unemployment is 0.0%. Housing is both higher-cost and owner-heavy: median home value is $1,005,500 (125% above the average Maryland ZIP), while 95.3% of occupied homes 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 -. The page also surfaces 10 ZIP codes within roughly 10 miles and 6 more in Howard County, so 21723 can be compared with both its immediate and county-level context.
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.
- Professional, scientific, and technical services
Professional, scientific, and technical services
7 establishments
- Construction
Construction
3 establishments
- Retail trade
Retail trade
3 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, 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
Who lives in ZIP 21723?
48.3
Median Age
44.4%
Male
55.6%
Female
44.7%
Foreign-Born
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 ZIP avg
$72,952
Per Capita Income
0.0%
Poverty Rate
0.0%
Unemployment Rate
How ZIP 21723 ranks among Maryland ZIPs
Cooksville, MD household income vs. every Maryland ZIP code
Median household income among 419 reporting Maryland ZIPs (this ZIP's population is too small for a reliable national-corpus placement)
$241,250 Top 3% higher than 97% of 419 Maryland ZIPs
Each bar is a $20K-wide band; taller bars hold more Maryland 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?
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
Housing stock: occupied vs vacant
232housing units
232
Total Housing Units
232
Occupied Units
0
Vacant Units
2.88
Avg Household Size
Occupancy Type
$1,005,500
Median Home Value
+125% vs state ZIP avg
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.
- 21042
Ellicott City (21042)
38,076 residents
- 21784
Sykesville (21784)
37,941 residents
- 21797 8,839
Woodbine (21797)
8,839 residents
- 20833 7,735
Brookeville (20833)
7,735 residents
- 21104 4,601
Marriottsville (21104)
4,601 residents
- 21738 3,268
Glenwood (21738)
3,268 residents
- 21794 2,434
West Friendship (21794)
2,434 residents
- 21036 2,114
Dayton (21036)
2,114 residents
- 21737 1,458
Glenelg (21737)
1,458 residents
What this shows Among its immediate neighbors, ZIP 21723 ranks #0 by population - useful context the national average alone can't give.
ZIP 21723 vs its nearest neighbors, by median income
Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 21737
Glenelg (21737)
$250,000 median income
- 21738
Glenwood (21738)
$250,000 median income
- 21723
Cooksville (21723)
$241,250 median income
- 21794
West Friendship (21794)
$231,466 median income
- 21036
Dayton (21036)
$218,036 median income
- 20833
Brookeville (20833)
$204,375 median income
- 21104
Marriottsville (21104)
$191,804 median income
- 21042
Ellicott City (21042)
$190,061 median income
- 20862
Brinklow (20862)
$189,667 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.
| 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 |
Nationwide ZIPs with similar ACS profiles
Two Census-derived peer sets for ZIP 21723, both outside MD so the neighborhoods are not geographic containment (Nearby and same-county blocks stay local).
Similar median household income
Nearest cross-state ZIPs by ACS median household income.
More ZIP Codes in Howard County
Related Areas
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.
Related
Take this with you
What to do with ZIP 21723's numbers, next.
- See how ZIP 21723 compares to a neighboring ZIP code on the same Census fields Compare this ZIP
- Check where Cooksville, MD ranks among every U.S. ZIP code on income, education, or homeownership View national rankings
- Save this ZIP to your shortlist to track alongside others you're considering View your shortlist
ZIP Code Tabulation Areas (ZCTAs) are Census Bureau approximations of USPS ZIP codes; figures describe the ZCTA area, not any single address within it.