ZIP Code 18109
standardSource:
Allentown · Lehigh County · Pennsylvania
- Population
- 16,932
- Median income
- $58,031
- Median home value
- $198,800
- Bachelor's or higher
- 16.0%
- Land area
- 21.2 sq mi
798/sq mi
▼ 24% vs US
higher than 26% of US ZIPs
▼ 29% vs US
higher than 43% of US ZIPs
Median age 36.6
New York
ZIP code 18109 in Allentown, Pennsylvania has a population of 16,932. The median household income is $58,031, which is 24% below the national average. Median home value is $198,800, 29% below the US average. 16.0% of residents hold a bachelor's degree or higher.
ZIP code 18109 is classified by USPS as a standard delivery area and covers roughly 21.2 square miles in Allentown, Lehigh County, Pennsylvania. The area is home to 16,932 residents, producing a population density of 798 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 18109 against Pennsylvania and the nation.
On the economic side, the median household income for ZIP 18109 sits at $58,031 (25% below the Pennsylvania average), while per-capita income is $28,396. The poverty rate stands at 18.1% and the unemployment rate at 8.2%. On housing, the median home value is $198,800 (13% below the state average) with median rent at $1,331 per month, and 52.1% of occupied units are owner-occupied, a direct signal of whether 18109 behaves more like a homeowner neighborhood or a renter-heavy ZIP.
Education and household profile round out the picture: 16.0% of adults hold a bachelor's degree or higher, the median age is 36.6, and the average commute is 23 minutes. We also surface 10 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Lehigh County, so you can benchmark 18109 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 18109
Top 5 sectors by establishment count
Which industries have the most business establishments in ZIP 18109.
- Health care and social assistance
Health care and social assistance
103 establishments
- Retail trade
Retail trade
92 establishments
- Other services (except public administration)
Other services (except public administration)
84 establishments
- Accommodation and food services
Accommodation and food services
79 establishments
- Wholesale trade
Wholesale trade
77 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 18109, Allentown, PA · 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
16,932
Population
21.2
Area (sq mi)
798
People / sq mi
New York
Time Zone
standard
ZIP Type
Who lives in ZIP 18109?
36.6
Median Age
49.7%
Male
50.3%
Female
25.3%
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?
$58,031
Median Household Income
-25% vs state
$28,396
Per Capita Income
18.1%
Poverty Rate
8.2%
Unemployment Rate
23.3 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?
7,519
Total Housing Units
7,030
Occupied Units
489
Vacant Units
2.61
Avg Household Size
Occupancy Type
$198,800
Median Home Value
-13% vs state
$1,331
Median Rent
1963
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
+3.7%
YoY Change (2024)
308
HPI Index (2000 = 100)
+208%
Total Change Since 2000
Home values in ZIP 18109 have increased 3.7% over the past year (2024). Since 2000, this ZIP has seen +208% cumulative appreciation.
| Year | Annual Change | HPI Index |
|---|---|---|
| 2020 | +3.6% | 190 |
| 2021 | +17.2% | 223 |
| 2022 | +16.7% | 260 |
| 2023 | +14.2% | 297 |
| 2024 | +3.7% | 308 |
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 802 business establishments in ZIP 18109, employing approximately 17,337 people with a combined annual payroll of $1,083,731,000.
802
Businesses
17,337
Employees
$1.1B
Annual Payroll
16
Industry Sectors
| Industry | Establishments | % of Total |
|---|---|---|
| Health care and social assistance | 103 | 12.8% |
| Retail trade | 92 | 11.5% |
| Other services (except public administration) | 84 | 10.5% |
| Accommodation and food services | 79 | 9.8% |
| Wholesale trade | 77 | 9.6% |
| Administrative and support and waste management and remediation services | 56 | 7.0% |
| Manufacturing | 55 | 6.9% |
| Transportation and warehousing | 54 | 6.7% |
| Construction | 44 | 5.5% |
| Real estate and rental and leasing | 38 | 4.7% |
| Professional, scientific, and technical services | 37 | 4.6% |
| Finance and insurance | 25 | 3.1% |
| Management of companies and enterprises | 18 | 2.2% |
| Information | 16 | 2.0% |
| Educational services | 13 | 1.6% |
| Arts, entertainment, and recreation | 10 | 1.3% |
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 18109 vs 18032 →
| ZIP Code | City | Population | Distance |
|---|---|---|---|
| 18032 | Catasauqua, PA | 9,285 | 2.0 mi |
| 18016 | Bethlehem, PA | 0 | 2.5 mi |
| 18018 | Bethlehem, PA | 32,413 | 2.4 mi |
| 18101 | Allentown, PA | 3,897 | 2.8 mi |
| 18102 | Allentown, PA | 49,779 | 2.7 mi |
| 18017 | Bethlehem, PA | 37,549 | 3.2 mi |
| 18052 | Whitehall, PA | 26,902 | 3.6 mi |
| 18105 | Allentown, PA | 12 | 3.7 mi |
| 18103 | Allentown, PA | 45,336 | 5.1 mi |
| 18015 | Bethlehem, PA | 32,832 | 4.9 mi |
More ZIP Codes in Lehigh County
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Frequently Asked Questions
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How many businesses are in ZIP code 18109? ▼
What are the main industries in ZIP code 18109? ▼
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ZIP Code Research Guides
Official Data Resources for Allentown, PA
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.