ZIP Code 21918
standardSource:
Conowingo · Cecil County · Maryland
- Population
- 4,284
- Median income
- $84,587
- Median home value
- $324,800
- Bachelor's or higher
- 16.1%
- Land area
- 45.7 sq mi
94/sq mi
▲ 11% vs US
higher than 68% of US ZIPs
▲ 17% vs US
higher than 70% of US ZIPs
Median age 42.9
New York
ZIP code 21918 in Conowingo, Maryland has a population of 4,284. The median household income is $84,587, which is 11% above the national average. Median home value is $324,800, 17% above the US average. 16.1% of residents hold a bachelor's degree or higher.
ZIP code 21918 is classified by USPS as a standard delivery area and covers roughly 45.7 square miles in Conowingo, Cecil County, Maryland. The area is home to 4,284 residents, producing a population density of 94 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 21918 against Maryland and the nation.
On the economic side, the median household income for ZIP 21918 sits at $84,587 (26% below the Maryland average), while per-capita income is $47,697. The poverty rate stands at 6.1% and the unemployment rate at 3.1%. On housing, the median home value is $324,800 (27% below the state average) with median rent at $876 per month, and 88.6% of occupied units are owner-occupied, a direct signal of whether 21918 behaves more like a homeowner neighborhood or a renter-heavy ZIP.
Education and household profile round out the picture: 16.1% of adults hold a bachelor's degree or higher, the median age is 42.9, and the average commute is 36 minutes. We also surface 10 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Cecil County, so you can benchmark 21918 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 21918
Top 5 sectors by establishment count
Which industries have the most business establishments in ZIP 21918.
- Construction
Construction
10 establishments
- Other services (except public administration)
Other services (except public administration)
7 establishments
- Retail trade
Retail trade
6 establishments
- Wholesale trade
Wholesale trade
4 establishments
- Transportation and warehousing
Transportation and warehousing
4 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 21918, Conowingo, 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
4,284
Population
45.7
Area (sq mi)
94
People / sq mi
New York
Time Zone
standard
ZIP Type
Who lives in ZIP 21918?
42.9
Median Age
50.9%
Male
49.1%
Female
0.3%
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?
$84,587
Median Household Income
-26% vs state
$47,697
Per Capita Income
6.1%
Poverty Rate
3.1%
Unemployment Rate
35.6 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?
1,815
Total Housing Units
1,775
Occupied Units
40
Vacant Units
2.34
Avg Household Size
Occupancy Type
$324,800
Median Home Value
-27% vs state
$876
Median Rent
1987
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
-8.4%
YoY Change (2024)
225
HPI Index (2000 = 100)
+125%
Total Change Since 2000
Home values in ZIP 21918 have decreased 8.4% over the past year (2024). Since 2000, this ZIP has seen +125% cumulative appreciation.
| Year | Annual Change | HPI Index |
|---|---|---|
| 2020 | +2.6% | 179 |
| 2021 | +13.6% | 204 |
| 2022 | +11.5% | 227 |
| 2023 | +8.4% | 246 |
| 2024 | -8.4% | 225 |
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 48 business establishments in ZIP 21918, employing approximately 260 people with a combined annual payroll of $10,747,000.
48
Businesses
260
Employees
$10.7M
Annual Payroll
9
Industry Sectors
| Industry | Establishments | % of Total |
|---|---|---|
| Construction | 10 | 20.8% |
| Other services (except public administration) | 7 | 14.6% |
| Retail trade | 6 | 12.5% |
| Wholesale trade | 4 | 8.3% |
| Transportation and warehousing | 4 | 8.3% |
| Real estate and rental and leasing | 4 | 8.3% |
| Administrative and support and waste management and remediation services | 3 | 6.3% |
| Health care and social assistance | 3 | 6.3% |
| Accommodation and food services | 3 | 6.3% |
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 21918 vs 21917 →
| ZIP Code | City | Population | Distance |
|---|---|---|---|
| 21917 | Colora, MD | 2,520 | 3.7 mi |
| 21034 | Darlington, MD | 3,387 | 3.7 mi |
| 17563 | Peach Bottom, PA | 3,849 | 5.7 mi |
| 21078 | Havre De Grace, MD | 17,603 | 8.0 mi |
| 21911 | Rising Sun, MD | 11,004 | 6.8 mi |
| 21904 | Port Deposit, MD | 7,252 | 6.3 mi |
| 21160 | Whiteford, MD | 2,408 | 7.8 mi |
| 19362 | Nottingham, PA | 5,815 | 7.1 mi |
| 21028 | Churchville, MD | 3,460 | 8.9 mi |
| 17518 | Drumore, PA | 1,355 | 9.7 mi |
More ZIP Codes in Cecil County
Related Areas
Frequently Asked Questions
What county is ZIP code 21918 in? ▼
What is the population of ZIP code 21918? ▼
What is the median household income in ZIP 21918? ▼
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What is the demographic makeup of ZIP 21918? ▼
How many businesses are in ZIP code 21918? ▼
What are the main industries in ZIP code 21918? ▼
How have home values changed in ZIP code 21918? ▼
What is the education level in ZIP code 21918? ▼
What is the average commute time in ZIP 21918? ▼
What percentage of residents own vs. rent in ZIP 21918? ▼
What is the poverty rate in ZIP code 21918? ▼
ZIP Code Research Guides
Official Data Resources for Conowingo, 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.