ZIP Code 21784
standardSource:
Sykesville · Carroll County · Maryland
- Population
- 37,941
- Median income
- $139,395
- Median home value
- $491,800
- Bachelor's or higher
- 53.0%
- Land area
- 149.0 sq mi
255/sq mi
▲ 83% vs US
higher than 95% of US ZIPs
▲ 77% vs US
higher than 87% of US ZIPs
Median age 38.9
New York
ZIP code 21784 in Sykesville, Maryland has a population of 37,941. The median household income is $139,395, which is 83% above the national average. Median home value is $491,800, 77% above the US average. 53.0% of residents hold a bachelor's degree or higher.
ZIP code 21784 is classified by USPS as a standard delivery area and covers roughly 149.0 square miles in Sykesville, Carroll County, Maryland. The area is home to 37,941 residents, producing a population density of 255 people per square mile, and falls within the New York time zone. These USPS and Census boundary values drive every downstream statistic on this page, including the benchmarks that compare 21784 against Maryland and the nation.
On the economic side, the median household income for ZIP 21784 sits at $139,395 (22% above the Maryland average), while per-capita income is $56,974. The poverty rate stands at 4.4% and the unemployment rate at 3.6%. On housing, the median home value is $491,800 (10% above the state average) with median rent at $1,739 per month, and 87.3% of occupied units are owner-occupied, a direct signal of whether 21784 behaves more like a homeowner neighborhood or a renter-heavy ZIP.
Education and household profile round out the picture: 53.0% of adults hold a bachelor's degree or higher, the median age is 38.9, and the average commute is 33 minutes. We also surface 10 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Carroll County, so you can benchmark 21784 against its immediate geography rather than a national average alone. Every figure is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates, HUD Fair Market Rents, and FHFA Home Price Index data, no estimates, no proprietary scoring. Verify with HUD →
Top industries in ZIP 21784
Top 5 sectors by establishment count
Which industries have the most business establishments in ZIP 21784.
- Construction
Construction
153 establishments
- Health care and social assistance
Health care and social assistance
131 establishments
- Professional, scientific, and technical services
Professional, scientific, and technical services
130 establishments
- Other services (except public administration)
Other services (except public administration)
105 establishments
- Retail trade
Retail trade
101 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 + HUD FMR + FHFA HPI ACS demographics, ZBP business establishments, HUD Fair Market Rents, FHFA HPI for ZIP 21784, Sykesville, MD · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; HUD FMR + FHFA HPI updated quarterly/annually.
Quick Facts
37,941
Population
149.0
Area (sq mi)
255
People / sq mi
New York
Time Zone
standard
ZIP Type
Who lives in ZIP 21784?
38.9
Median Age
50.0%
Male
50.0%
Female
6.9%
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?
$139,395
Median Household Income
+22% vs state
$56,974
Per Capita Income
4.4%
Poverty Rate
3.6%
Unemployment Rate
33.3 min
Mean Commute Time
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?
13,797
Total Housing Units
13,416
Occupied Units
381
Vacant Units
2.84
Avg Household Size
Occupancy Type
$491,800
Median Home Value
+10% vs state
$1,739
Median Rent
1986
Median Year Built
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
How have home values changed over time?
FHFA House Price Index, annual appreciation data based on repeat sales and appraisals
+8.3%
YoY Change (2024)
273
HPI Index (2000 = 100)
+173%
Total Change Since 2000
Home values in ZIP 21784 have increased 8.3% over the past year (2024). Since 2000, this ZIP has seen +173% cumulative appreciation.
| Year | Annual Change | HPI Index |
|---|---|---|
| 2020 | +1.9% | 197 |
| 2021 | +9.4% | 215 |
| 2022 | +12.3% | 242 |
| 2023 | +4.3% | 252 |
| 2024 | +8.3% | 273 |
Source: Federal Housing Finance Agency (FHFA) House Price Index, All-Transactions, Five-Digit ZIP Codes (Developmental Index). Index base = 100 in year 2000. Data through 2024. ZIP codes with few transactions may show missing values.
What businesses operate in this ZIP?
Census Bureau data shows 975 business establishments in ZIP 21784, employing approximately 12,994 people with a combined annual payroll of $662,024,000.
975
Businesses
12,994
Employees
$662.0M
Annual Payroll
17
Industry Sectors
| Industry | Establishments | % of Total |
|---|---|---|
| Construction | 153 | 15.7% |
| Health care and social assistance | 131 | 13.4% |
| Professional, scientific, and technical services | 130 | 13.3% |
| Other services (except public administration) | 105 | 10.8% |
| Retail trade | 101 | 10.4% |
| Accommodation and food services | 76 | 7.8% |
| Administrative and support and waste management and remediation services | 66 | 6.8% |
| Real estate and rental and leasing | 54 | 5.5% |
| Finance and insurance | 35 | 3.6% |
| Wholesale trade | 24 | 2.5% |
| Transportation and warehousing | 22 | 2.3% |
| Educational services | 19 | 1.9% |
| Arts, entertainment, and recreation | 17 | 1.7% |
| Manufacturing | 16 | 1.6% |
| Information | 14 | 1.4% |
| Management of companies and enterprises | 8 | 0.8% |
| Industries not classified | 3 | 0.3% |
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 21784 vs 21794 →
| ZIP Code | City | Population | Distance |
|---|---|---|---|
| 21794 | West Friendship, MD | 2,434 | 7.2 mi |
| 21723 | Cooksville, MD | 803 | 5.6 mi |
| 21104 | Marriottsville, MD | 4,601 | 5.0 mi |
| 21157 | Westminster, MD | 36,920 | 10.3 mi |
| 21048 | Finksburg, MD | 10,650 | 7.3 mi |
| 21797 | Woodbine, MD | 8,839 | 6.9 mi |
| 21738 | Glenwood, MD | 3,268 | 8.8 mi |
| 21163 | Woodstock, MD | 7,026 | 7.6 mi |
| 21737 | Glenelg, MD | 1,458 | 10.4 mi |
| 21042 | Ellicott City, MD | 38,076 | 10.0 mi |
More ZIP Codes in Carroll County
Related Areas
Frequently Asked Questions
What county is ZIP code 21784 in? ▼
What is the population of ZIP code 21784? ▼
What is the median household income in ZIP 21784? ▼
What is the average home value in ZIP 21784? ▼
What is the demographic makeup of ZIP 21784? ▼
How many businesses are in ZIP code 21784? ▼
What are the main industries in ZIP code 21784? ▼
How have home values changed in ZIP code 21784? ▼
What is the education level in ZIP code 21784? ▼
What is the average commute time in ZIP 21784? ▼
What percentage of residents own vs. rent in ZIP 21784? ▼
What is the poverty rate in ZIP code 21784? ▼
ZIP Code Research Guides
Official Data Resources for Sykesville, MD
Verify and explore additional data for this area using these official government sources.
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023). Business data: Source: Census ZIP Code Business Patterns (ZBP) 2023. Home value trends: Source: FHFA House Price Index (HPI), Five-Digit ZIP Codes.
PlainZIP is not affiliated with the U.S. Census Bureau or any government agency.
Read our methodology , how this data is sourced, computed, and verified.