18103 ZIP Code — Allentown, PA
Lehigh County, Pennsylvania
ZIP code 18103 is located in Allentown, Pennsylvania, within Lehigh County. It covers approximately 17.16 square miles and serves a population of 48,344 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 484/610.
About ZIP code 18103
The housing stock consists of a mix of housing types. Most homes were built in the 1950s, giving the area an established character. Median home value is $226,000. Owner-occupancy sits near the national average at 61%.
The gap between median ($70,069) and mean household income suggests income inequality — a small number of higher earners pull the average up. 34% of households receive Social Security income, suggesting a notable retiree or disability population.
The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 24 minutes is near the national average.
Educational attainment is near the national average, with 26% of residents holding a bachelor's degree or higher.
48,344
population
17.16
sq mi land
Standard
ZIP type
Eastern (ET)
timezone
18103 ZIP code map
Cities in ZIP code 18103
Below are the cities the US Postal Service accepts for ZIP code 18103. Using any city not on this list may result in mail delivery delays.
| City | Status |
|---|---|
| Allentown | Preferred |
Nearby ZIP codes
18025 Bethlehem (2.2 mi)
18102 Allentown (2.3 mi)
18101 Allentown (2.5 mi)
18099 Emmaus (2.5 mi)
18098 Emmaus (2.5 mi)
18049 Emmaus (3.8 mi)
18104 Allentown (4.3 mi)
18195 Allentown (4.6 mi)
18034 Center Valley (4.6 mi)
18003 Lehigh Valley (5.4 mi)
18109 Allentown (5.4 mi)
18106 Allentown (5.7 mi)
Demographics
updated 05/2026
| Population | |
|---|---|
| Total population | 48,344 |
| Population density | 2,817 / sq mi |
| State FIPS | 42 |
| County FIPS | 077 |
| Geography | |
|---|---|
| Land area | 17.16 sq mi |
| Water area | 0.11 sq mi |
| Latitude | 40.5737 |
| Longitude | -75.4818 |
| Timezone | Eastern (ET) |
| Area code | 484/610 |
Total population by age
Gender
Race & ethnicity
Economics
updated 05/2026
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 40.9% | 37.9% | 39.8% |
| $50k – $100k | 31.7% | 30.5% | 30.8% |
| $100k – $200k | 22.0% | 24.2% | 22.4% |
| Over $200k | 5.3% | 7.4% | 7.1% |
Demographics & statistics
48,344
Population
2,817
People per sq mi
38.2
Median age
$70,069
Median household income
$37,771
Per capita income
$226,000
Median home value
$1,269
Median monthly rent
60.7%
Home ownership
11.8%
Poverty rate
6.1%
Unemployment
12,540
Housing units
26.2%
Bachelor's or higher
Age distribution
Male
Female
1,652
Under 5
1,619
1,331
5–9
1,303
1,342
10–14
1,314
1,613
15–19
1,580
1,538
20–24
1,507
3,707
25–34
3,631
2,826
35–44
2,767
2,684
45–54
2,628
1,943
55–59
1,903
1,667
60–64
1,632
2,327
65–74
2,279
1,163
75–84
1,140
630
85+
618
← Male
Female →
Age summary
| Group | Count | % |
|---|---|---|
| Under 18 | 10,297 | 21.3% |
| 18 and over | 38,047 | 78.7% |
| 65 and over | 8,157 | 16.9% |
| Median age | 38.2 years | |
Race & ethnicity
White
48%
Hispanic or Latino
18.9%
Two or more races
12.3%
Other race
10%
Black or African American
7.5%
Asian
2.4%
American Indian / Alaska Native
0.9%
| Group | Count | % |
|---|---|---|
| White | 28,602 | 48% |
| Hispanic or Latino | 11,266 | 18.9% |
| Two or more races | 7,356 | 12.3% |
| Other race | 5,954 | 10% |
| Black or African American | 4,449 | 7.5% |
| Asian | 1,440 | 2.4% |
| American Indian / Alaska Native | 543 | 0.9% |
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 40.9% | 37.9% | 39.8% |
| $50k – $100k | 31.7% | 30.5% | 30.8% |
| $100k – $200k | 22.0% | 24.2% | 22.4% |
| Over $200k | 5.3% | 7.4% | 7.1% |
Under $10k
3.2%
$10k–$15k
3.2%
$15k–$25k
7.9%
$25k–$35k
6.9%
$35k–$50k
12.9%
$50k–$75k
20.3%
$75k–$100k
12.3%
$100k–$150k
16.7%
$150k–$200k
9.1%
$200k+
7.5%
| Range | % of households |
|---|---|
| Under $10k | 3.2% |
| $10k–$15k | 3.2% |
| $15k–$25k | 7.9% |
| $25k–$35k | 6.9% |
| $35k–$50k | 12.9% |
| $50k–$75k | 20.3% |
| $75k–$100k | 12.3% |
| $100k–$150k | 16.7% |
| $150k–$200k | 9.1% |
| $200k+ | 7.5% |
| Median income | $70,069 |
Housing
Home values
Under $50k
2.9%
$50k–$100k
3.4%
$100k–$150k
15.9%
$150k–$200k
18.7%
$200k–$300k
28.6%
$300k–$500k
24.0%
$500k–$1M
6.3%
$1M+
0.2%
Housing overview
| Metric | Value |
|---|---|
| Median home value | $226,000 |
| Median rent / month | $1,269 |
| Owner occupied | 60.7% |
| Renter occupied | 39.3% |
| Vacant | 5.7% |
| Single-family detached | 49.4% |
| Large apartment buildings | 6.0% |
| Mobile homes | 0.3% |
| Median rooms | 5.8 |
| Avg household size (owned) | 2.54 |
Year built
| Era | % |
|---|---|
| 2020 or later | 0.1% |
| 2010–2019 | 1.4% |
| 2000–2009 | 4.4% |
| 1990–1999 | 5.7% |
| 1980–1989 | 12.2% |
| 1970–1979 | 14.3% |
| 1960–1969 | 16.8% |
| 1950–1959 | 20.5% |
| 1940–1949 | 8.1% |
| 1939 or earlier | 16.5% |
Bedrooms
| Size | % of units |
|---|---|
| No bedroom (studio) | 2.6% |
| 1 bedroom | 14.0% |
| 2 bedrooms | 19.0% |
| 3 bedrooms | 43.2% |
| 4 bedrooms | 17.1% |
| 5+ bedrooms | 4.0% |
Vehicles per household
| Vehicles | % of households |
|---|---|
| No vehicle | 7.5% |
| 1 vehicle | 35.6% |
| 2 vehicles | 38.2% |
| 3 or more | 18.6% |
Heating fuel
| Fuel type | % |
|---|---|
| Utility gas | 31.6% |
| Electricity | 44.4% |
| Propane / LP gas | 1.1% |
| Fuel oil | 21.5% |
| Wood | 0.6% |
| Solar | 0.1% |
| No fuel used | 0.1% |
Households & families
| Household type | Count | % |
|---|---|---|
| Married-couple family | 9,227 | 49.1% |
| Cohabiting couple | 1,715 | 9.1% |
| Male householder, no spouse | 3,505 | 18.6% |
| Female householder, no spouse | 4,352 | 23.2% |
| Households with children under 18 | 5,765 | 30.7% |
| Households with seniors (65+) | 5,772 | 30.7% |
| Average household size | 2.53 | |
Marital status
| Status | Male | Female |
|---|---|---|
| Never married | 37.3% | 30.1% |
| Married | 49.4% | 49.2% |
| Separated | 2.2% | 3.8% |
| Widowed | 3.3% | 6.8% |
| Divorced | 7.9% | 10.1% |
Education
Less than 9th grade
5.2%
Some HS, no diploma
6.0%
HS graduate
35.4%
Some college, no degree
18.8%
Associate's degree
8.4%
Bachelor's degree
17.3%
Graduate / professional
8.9%
| Metric | % |
|---|---|
| HS diploma or higher | 88.9% |
| Bachelor's or higher | 26.2% |
School enrollment (ages 3–17)
| Type | Count | % |
|---|---|---|
| Nursery / preschool | 543 | 5.5% |
| Kindergarten | 646 | 6.6% |
| Elementary school | 4,113 | 41.8% |
| High school | 2,304 | 23.4% |
| College / grad school | 2,233 | 22.7% |
Employment
Industry of employment
Education & healthcare
23.0%
Manufacturing
15.7%
Retail trade
13.0%
Professional & management
10.4%
Transportation & utilities
9.8%
Arts, food & hospitality
7.4%
Construction
4.8%
Other services
4.4%
Finance & real estate
3.8%
Wholesale trade
3.2%
Public administration
2.5%
Information
1.9%
Agriculture & mining
0.1%
Occupation
| Category | % |
|---|---|
| Management, business & arts | 30.0% |
| Service | 18.3% |
| Sales & office | 19.3% |
| Natural resources & construction | 7.5% |
| Production & transportation | 24.9% |
Employment type
| Type | % |
|---|---|
| Private sector | 88.8% |
| Government | 6.8% |
| Self-employed | 4.2% |
| Unpaid family workers | 0.2% |
Commute
| Method | % |
|---|---|
| Drive alone | 77.0% |
| Carpool | 11.0% |
| Public transit | 1.2% |
| Walk | 2.1% |
| Work from home | 7.3% |
| Other means | 1.4% |
| Avg commute (minutes) | 24.1 |
Poverty
All people
11.8%
Under 18 years
18.2%
18 and over
10.1%
Married-couple families
4.2%
Female-led households
33.0%
Income support
| Source | % of households |
|---|---|
| Social Security | 34.0% |
| Retirement income | 26.1% |
| Supplemental Security | 6.1% |
| Cash public assistance | 4.5% |
| Food stamps / SNAP | 14.7% |
Health indicators
| Condition | % |
|---|---|
| Obesity | 36.6% |
| High blood pressure | 33.3% |
| High cholesterol | 32.9% |
| Diabetes | 11.8% |
| Heart disease | 6.9% |
| Stroke | 3.2% |
| Asthma | 10.3% |
| Arthritis | 26.4% |
| Kidney disease | 3.1% |
| Pulmonary disease | 7.4% |
| Cancer | 6.6% |
| Behavior / access | % |
|---|---|
| Smoking | 19.1% |
| Binge drinking | 17.3% |
| No physical activity | 27.4% |
| Less than 7 hrs sleep | 38.4% |
| Depression | 21.4% |
| Fair or poor health | 16.7% |
| Poor mental health | 15.7% |
| Poor physical health | 11.6% |
| No health insurance | 15.6% |
| Visited doctor (checkup) | 78.7% |
| Visited dentist | 62.8% |
| Cholesterol screening | 88.9% |
| Teeth loss | 15.2% |
Veterans & disability
| Veterans | Count | % |
|---|---|---|
| Civilian veterans | 2,439 | 6.4% |
| Disability | % |
|---|---|
| Any disability | 13.8% |
| Under 18 | 9.2% |
| 18–64 years | 11.0% |
| 65 and over | 30.4% |
Health insurance coverage
| Type | % |
|---|---|
| Private insurance | 63.6% |
| Public insurance | 39.3% |
| No insurance | 9.4% |
| Uninsured under 19 | 4.6% |
Language & origin
Language spoken at home (age 5+)
| Language | Count | % |
|---|---|---|
| English only | 45,073 | 93.2% |
| Spanish | 7,931 | 17.6% |
| Other Indo-European | 6,700 | 14.9% |
| Asian & Pacific Islander | 234 | 0.5% |
| Other languages | 637 | 1.4% |
Place of birth & citizenship
| Origin | Count | % |
|---|---|---|
| Native born (US) | 40,227 | 83.2% |
| Born in same state | 36,073 | 74.6% |
| Born in different state | 25,286 | 52.3% |
| Foreign born | 4,154 | 8.6% |
| Naturalized citizen | 8,117 | 16.8% |
| Not a US citizen | 3,955 | 48.7% |
Ancestry
| Ancestry | Count | % |
|---|---|---|
| Italian | 4,132 | 8.5% |
| French | 1,504 | 3.1% |
| Arab | 1,239 | 2.6% |
| Irish | 656 | 1.4% |
| English | 388 | 0.8% |
| Ancestry | Count | % |
|---|---|---|
| Norwegian | 221 | 0.5% |
| German | 87 | 0.2% |
| Polish | 76 | 0.2% |
| Dutch | 28 | 0.1% |
Technology access
| Metric | % of households |
|---|---|
| Computer access | 38.9% |
| Internet access | 92.7% |
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 18103
What city is ZIP code 18103 in?
ZIP code 18103 is primarily assigned to Allentown, Pennsylvania.
What county is ZIP code 18103 in?
ZIP code 18103 falls within Lehigh County, Pennsylvania.
What is the population of ZIP code 18103?
ZIP code 18103 has an estimated population of 48,344 residents, with a density of 2,818 people per square mile.
What is the typical home value in ZIP code 18103?
The median home value in ZIP code 18103 is $226,000.
What is the median household income in ZIP code 18103?
The median household income in ZIP code 18103 is $70,069, below the national median of ~$75,000.
What timezone is ZIP code 18103 in?
ZIP code 18103 observes the EST timezone.