ZIP Code 18103
standardSource:
Allentown · Lehigh County · Pennsylvania
- Population
- 45,336
- Median income
- $72,895
- Median home value
- $272,700
- Bachelor's or higher
- 27.6%
- Land area
- 45.6 sq mi
994/sq mi
▼ 4% vs US
higher than 51% of US ZIPs
▼ 2% vs US
higher than 62% of US ZIPs
Median age 39.1
New York
ZIP code 18103 in Allentown, Pennsylvania has a population of 45,336. The median household income is $72,895, which is 4% below the national average. Median home value is $272,700, 2% below the US average. 27.6% of residents hold a bachelor's degree or higher.
ZIP code 18103 is classified by USPS as a standard delivery area and covers roughly 45.6 square miles in Allentown, Lehigh County, Pennsylvania. The area is home to 45,336 residents, producing a population density of 994 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 18103 against Pennsylvania and the nation.
On the economic side, the median household income for ZIP 18103 sits at $72,895 (6% below the Pennsylvania average), while per-capita income is $40,738. The poverty rate stands at 10.3% and the unemployment rate at 5.8%. On housing, the median home value is $272,700 (20% above the state average) with median rent at $1,368 per month, and 63.1% of occupied units are owner-occupied, a direct signal of whether 18103 behaves more like a homeowner neighborhood or a renter-heavy ZIP.
Education and household profile round out the picture: 27.6% of adults hold a bachelor's degree or higher, the median age is 39.1, and the average commute is 25 minutes. We also surface 10 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Lehigh County, so you can benchmark 18103 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 18103
Top 5 sectors by establishment count
Which industries have the most business establishments in ZIP 18103.
- Health care and social assistance
Health care and social assistance
226 establishments
- Retail trade
Retail trade
127 establishments
- Other services (except public administration)
Other services (except public administration)
122 establishments
- Accommodation and food services
Accommodation and food services
97 establishments
- Professional, scientific, and technical services 67
Professional, scientific, and technical services
67 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 18103, 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
45,336
Population
45.6
Area (sq mi)
994
People / sq mi
New York
Time Zone
standard
ZIP Type
Who lives in ZIP 18103?
39.1
Median Age
49.4%
Male
50.6%
Female
20.4%
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?
$72,895
Median Household Income
-6% vs state
$40,738
Per Capita Income
10.3%
Poverty Rate
5.8%
Unemployment Rate
24.5 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?
19,775
Total Housing Units
18,880
Occupied Units
895
Vacant Units
2.54
Avg Household Size
Occupancy Type
$272,700
Median Home Value
+20% vs state
$1,368
Median Rent
1964
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
+2.5%
YoY Change (2024)
268
HPI Index (2000 = 100)
+168%
Total Change Since 2000
Home values in ZIP 18103 have increased 2.5% over the past year (2024). Since 2000, this ZIP has seen +168% cumulative appreciation.
| Year | Annual Change | HPI Index |
|---|---|---|
| 2020 | +2.3% | 178 |
| 2021 | +14.1% | 204 |
| 2022 | +17.8% | 240 |
| 2023 | +9.0% | 262 |
| 2024 | +2.5% | 268 |
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 1,044 business establishments in ZIP 18103, employing approximately 28,576 people with a combined annual payroll of $1,801,825,000.
1,044
Businesses
28,576
Employees
$1.8B
Annual Payroll
16
Industry Sectors
| Industry | Establishments | % of Total |
|---|---|---|
| Health care and social assistance | 226 | 21.6% |
| Retail trade | 127 | 12.2% |
| Other services (except public administration) | 122 | 11.7% |
| Accommodation and food services | 97 | 9.3% |
| Professional, scientific, and technical services | 67 | 6.4% |
| Construction | 64 | 6.1% |
| Administrative and support and waste management and remediation services | 59 | 5.7% |
| Transportation and warehousing | 57 | 5.5% |
| Finance and insurance | 57 | 5.5% |
| Real estate and rental and leasing | 45 | 4.3% |
| Wholesale trade | 41 | 3.9% |
| Manufacturing | 28 | 2.7% |
| Arts, entertainment, and recreation | 16 | 1.5% |
| Information | 14 | 1.3% |
| Management of companies and enterprises | 12 | 1.1% |
| Educational services | 9 | 0.9% |
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 18103 vs 18105 →
| ZIP Code | City | Population | Distance |
|---|---|---|---|
| 18105 | Allentown, PA | 12 | 2.2 mi |
| 18102 | Allentown, PA | 49,779 | 2.6 mi |
| 18101 | Allentown, PA | 3,897 | 2.3 mi |
| 18049 | Emmaus, PA | 17,341 | 3.8 mi |
| 18034 | Center Valley, PA | 8,256 | 3.9 mi |
| 18046 | East Texas, PA | 64 | 4.4 mi |
| 18032 | Catasauqua, PA | 9,285 | 6.0 mi |
| 18104 | Allentown, PA | 43,236 | 4.4 mi |
| 18109 | Allentown, PA | 16,932 | 5.1 mi |
| 18052 | Whitehall, PA | 26,902 | 6.1 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 18103? ▼
What are the main industries in ZIP code 18103? ▼
How have home values changed in ZIP code 18103? ▼
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What is the average commute time in ZIP 18103? ▼
What percentage of residents own vs. rent in ZIP 18103? ▼
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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.