Glenelg, MD · standard
ZIP Code 21737
Howard County, Maryland - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.
- 1,458
- 111/sq mi High-density area
- $250,000+
- Median income Above-median income area
- $996,400
- Median home value Above-median home value
- 75.8%
- Bachelor's or higher Above-average bachelor's attainment
National ZIP placement
Glenelg 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
- 111
- people per sq mi
- 93%
- owner-occupied homes
Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 21737 against every reporting US ZIP.
FHFA HPI release change
What changed in the latest House Price Index year
- FHFA House Price Index values in ZIP 21737 (Glenelg, MD) rose +7.6% from 2023 to 2024.
ZIP code 21737 is a sparsely populated ZIP (a standard USPS delivery area) in Glenelg, Howard County, Maryland, home to just 1,458 residents across 13.2 square miles, a density of 111 people per square mile, in the New York time zone.
ZIP 21737 skews affluent, with a median household income of $250,000+ (119% above the average Maryland ZIP), while per-capita income is $101,402. Both reported hardship measures are comparatively low in absolute terms: poverty is 0.2% and unemployment is 0.2%. Housing is both higher-cost and owner-heavy: median home value is $996,400 (123% above the average Maryland ZIP), while 93.2% of occupied homes are owner-occupied.
This is a highly-educated ZIP: 75.8% of adults hold a bachelor's degree or higher, the median age is 38.8, and the average commute is -. The page also surfaces 10 ZIP codes within roughly 10 miles and 6 more in Howard County, so 21737 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 21737
Top 5 sectors by establishment count in Glenelg, MD
Which industries have the most business establishments in ZIP 21737.
- Professional, scientific, and technical services
Professional, scientific, and technical services
28 establishments
- Retail trade 7
Retail trade
7 establishments
- Health care and social assistance 7
Health care and social assistance
7 establishments
- Accommodation and food services 7
Accommodation and food services
7 establishments
- Construction 5
Construction
5 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 21737, Glenelg, 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
1,458
Population
13.2
Area (sq mi)
111
People / sq mi
New York
Time Zone
standard
ZIP Type
Who lives in ZIP 21737?
38.8
Median Age
45.2%
Male
54.8%
Female
19.2%
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?
$250,000+
Median Household Income
+119% vs state ZIP avg
$101,402
Per Capita Income
0.2%
Poverty Rate
0.2%
Unemployment Rate
How ZIP 21737 ranks among Maryland ZIPs
Glenelg, 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)
$250,000 Top 2% higher than 98% 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
739housing units
739
Total Housing Units
739
Occupied Units
0
Vacant Units
3.34
Avg Household Size
Occupancy Type
$996,400
Median Home Value
+123% 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 83 business establishments in ZIP 21737, employing approximately 678 people with a combined annual payroll of $39,442,000.
83
Businesses
678
Employees
$39.4M
Annual Payroll
12
Industry Sectors
| Industry | Establishments | % of Total |
|---|---|---|
| Professional, scientific, and technical services | 28 | 33.7% |
| Retail trade | 7 | 8.4% |
| Health care and social assistance | 7 | 8.4% |
| Accommodation and food services | 7 | 8.4% |
| Construction | 5 | 6.0% |
| Administrative and support and waste management and remediation services | 5 | 6.0% |
| Other services (except public administration) | 5 | 6.0% |
| Finance and insurance | 4 | 4.8% |
| Real estate and rental and leasing | 4 | 4.8% |
| Wholesale trade | 3 | 3.6% |
| Transportation and warehousing | 3 | 3.6% |
| Arts, entertainment, and recreation | 3 | 3.6% |
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 21737 vs 21738 →
ZIP 21737 vs its nearest neighbors, by population
Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 21029
Clarksville (21029)
11,333 residents
- 21797
Woodbine (21797)
8,839 residents
- 20833
Brookeville (20833)
7,735 residents
- 21738 3,268
Glenwood (21738)
3,268 residents
- 21794 2,434
West Friendship (21794)
2,434 residents
- 20860 2,396
Sandy Spring (20860)
2,396 residents
- 21036 2,114
Dayton (21036)
2,114 residents
- 20861 1,875
Ashton (20861)
1,875 residents
- 21737 1,458
Glenelg (21737)
1,458 residents
What this shows Among its immediate neighbors, ZIP 21737 ranks #9 by population - useful context the national average alone can't give.
ZIP 21737 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
- 21029
Clarksville (21029)
$243,542 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
- 20862
Brinklow (20862)
$189,667 median income
- 21797
Woodbine (21797)
$189,241 median income
What this shows By household income, ZIP 21737 ranks the highest 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 | 1.8 mi |
| 21036 | Dayton, MD | 2,114 | 1.7 mi |
| 20862 | Brinklow, MD | 343 | 4.9 mi |
| 21723 | Cooksville, MD | 803 | 4.9 mi |
| 20833 | Brookeville, MD | 7,735 | 3.9 mi |
| 21794 | West Friendship, MD | 2,434 | 3.8 mi |
| 20860 | Sandy Spring, MD | 2,396 | 7.4 mi |
| 21029 | Clarksville, MD | 11,333 | 4.9 mi |
| 20861 | Ashton, MD | 1,875 | 7.2 mi |
| 21797 | Woodbine, MD | 8,839 | 6.1 mi |
Nationwide ZIPs with similar ACS profiles
Two Census-derived peer sets for ZIP 21737, both outside MD so the neighborhoods are not geographic containment (Nearby and same-county blocks stay local).
Similar population
Nearest cross-state ZIPs by resident population (1,458 here; floor ≥1,000).
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 21737 in?
ZIP code 21737 (Glenelg) 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 21737?
ZIP code 21737 in Glenelg, MD has a population of 1,458 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 21737?
The median household income in ZIP 21737 is $250,000+, which is 228% above the national average of $76,288.
What is the average home value in ZIP 21737?
The median home value in ZIP 21737 is $996,400, which is 258% above the national average of $278,155.
What is the demographic makeup of ZIP 21737?
The largest racial group in ZIP 21737 is White at 60.2%. Hispanic or Latino residents make up 0.4% of the population.
How many businesses are in ZIP code 21737?
ZIP code 21737 has 83 business establishments employing approximately 678 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 21737?
The top industries by establishment count in ZIP 21737 are: Professional, scientific, and technical services (28), Retail trade (7), Health care and social assistance (7). There are 12 industry sectors represented in total.
What is the education level in ZIP code 21737?
In ZIP code 21737, 84.7% of residents aged 25+ have a high school diploma or higher, and 75.8% 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 21737?
In ZIP code 21737, approximately 93.2% of occupied housing units are owner-occupied and 6.8% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 21737?
The poverty rate in ZIP code 21737 is 0.2% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.
Related
Take this with you
What to do with ZIP 21737's numbers, next.
- See how ZIP 21737 compares to a neighboring ZIP code on the same Census fields Compare this ZIP
- Check where Glenelg, 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.