18104 ZIP Code — Allentown, PA

Lehigh County, Pennsylvania

ZIP code 18104 is located in Allentown, Pennsylvania, within Lehigh County. It covers approximately 22.95 square miles and serves a population of 46,259 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 610.

About ZIP code 18104

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 $280,800. Owner-occupancy sits near the national average at 71%.

The gap between median ($83,861) and mean household income suggests income inequality — a small number of higher earners pull the average up. 37% 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 22 minutes is near the national average.

Educational attainment is near the national average, with 44% of residents holding a bachelor's degree or higher.

46,259

population

22.95

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

18104 ZIP code map

Cities in ZIP code 18104

Below are the cities the US Postal Service accepts for ZIP code 18104. Using any city not on this list may result in mail delivery delays.

City	Status
Allentown	Preferred

Nearby ZIP codes

18195 Allentown (2.9 mi) 18106 Allentown (3.2 mi) 18102 Allentown (3.5 mi) 18052 Whitehall (3.6 mi) 18101 Allentown (4 mi) 18069 Orefield (4.2 mi) 18103 Allentown (4.3 mi) 18025 Bethlehem (4.5 mi) 18037 Coplay (4.7 mi) 18032 Catasauqua (4.9 mi) 18087 Trexlertown (5.3 mi) 18078 Schnecksville (5.8 mi)

Demographics updated 05/2026

Population
Total population	46,259
Population density	2,016 / sq mi
State FIPS	42
County FIPS	077

Geography
Land area	22.95 sq mi
Water area	0.19 sq mi
Latitude	40.6156
Longitude	-75.5437
Timezone	Eastern (ET)
Area code	610

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	31.6%	37.9%	39.8%
$50k – $100k	33.0%	30.5%	30.8%
$100k – $200k	27.1%	24.2%	22.4%
Over $200k	8.3%	7.4%	7.1%

Demographics & statistics

46,259

Population

2,016

People per sq mi

39.4

Median age

$83,861

Median household income

$43,066

Per capita income

$280,800

Median home value

$1,507

Median monthly rent

71.3%

Home ownership

7.8%

Poverty rate

5.2%

Unemployment

13,131

Housing units

43.6%

Bachelor's or higher

Age distribution

Male Female

1,269

Under 5

1,420

1,196

5–9

1,339

1,170

10–14

1,311

1,682

15–19

1,883

1,613

20–24

1,807

2,717

25–34

3,043

2,753

35–44

3,082

2,414

45–54

2,703

1,095

55–59

1,226

1,347

60–64

1,508

2,413

65–74

2,703

1,285

75–84

1,438

869

85+

973

← Male

Female →

Age summary

Group	Count	%
Under 18	9,141	19.8%
18 and over	37,118	80.2%
65 and over	9,681	20.9%
Median age	39.4 years

Race & ethnicity

White 66.5%

Hispanic or Latino 9%

Two or more races 7.1%

Asian 7%

Black or African American 6.2%

Other race 3.9%

American Indian / Alaska Native 0.3%

Group	Count	%
White	33,822	66.5%
Hispanic or Latino	4,600	9%
Two or more races	3,616	7.1%
Asian	3,544	7%
Black or African American	3,140	6.2%
Other race	1,969	3.9%
American Indian / Alaska Native	143	0.3%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	31.6%	37.9%	39.8%
$50k – $100k	33.0%	30.5%	30.8%
$100k – $200k	27.1%	24.2%	22.4%
Over $200k	8.3%	7.4%	7.1%

Under $10k 3.5%

$10k–$15k 2.4%

$15k–$25k 6.7%

$25k–$35k 7.0%

$35k–$50k 9.9%

$50k–$75k 15.7%

$75k–$100k 13.7%

$100k–$150k 18.3%

$150k–$200k 11.6%

$200k+ 11.3%

Range	% of households
Under $10k	3.5%
$10k–$15k	2.4%
$15k–$25k	6.7%
$25k–$35k	7.0%
$35k–$50k	9.9%
$50k–$75k	15.7%
$75k–$100k	13.7%
$100k–$150k	18.3%
$150k–$200k	11.6%
$200k+	11.3%
Median income	$83,861

Housing

Home values

Under $50k 1.5%

$50k–$100k 0.7%

$100k–$150k 4.8%

$150k–$200k 13.4%

$200k–$300k 35.9%

$300k–$500k 35.1%

$500k–$1M 7.6%

$1M+ 1.1%

Housing overview

Metric	Value
Median home value	$280,800
Median rent / month	$1,507
Owner occupied	71.3%
Renter occupied	28.7%
Vacant	3.4%
Single-family detached	56.5%
Large apartment buildings	8.5%
Mobile homes	0.0%
Median rooms	6.4
Avg household size (owned)	2.52

Year built

Era	%
2020 or later	0.6%
2010–2019	7.0%
2000–2009	8.7%
1990–1999	8.2%
1980–1989	10.5%
1970–1979	15.2%
1960–1969	9.7%
1950–1959	19.1%
1940–1949	5.4%
1939 or earlier	15.7%

Bedrooms

Size	% of units
No bedroom (studio)	1.0%
1 bedroom	9.0%
2 bedrooms	18.8%
3 bedrooms	43.4%
4 bedrooms	23.5%
5+ bedrooms	4.3%

Vehicles per household

Vehicles	% of households
No vehicle	5.5%
1 vehicle	36.0%
2 vehicles	39.3%
3 or more	19.2%

Heating fuel

Fuel type	%
Utility gas	36.4%
Electricity	37.2%
Propane / LP gas	2.8%
Fuel oil	21.3%
Wood	0.5%
No fuel used	0.6%

Households & families

Household type	Count	%
Married-couple family	8,592	49.0%
Cohabiting couple	1,394	7.9%
Male householder, no spouse	2,810	16.0%
Female householder, no spouse	4,748	27.1%
Households with children under 18	5,233	29.8%
Households with seniors (65+)	6,263	35.7%
Average household size	2.42

Marital status

Status	Male	Female
Never married	35.4%	32.1%
Married	53.0%	44.6%
Separated	1.6%	2.4%
Widowed	2.8%	11.2%
Divorced	7.3%	9.7%

Education

Less than 9th grade 2.6%

Some HS, no diploma 3.8%

HS graduate 26.6%

Some college, no degree 14.4%

Associate's degree 8.9%

Bachelor's degree 24.6%

Graduate / professional 19.0%

Metric	%
HS diploma or higher	93.6%
Bachelor's or higher	43.6%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	796	6.5%
Kindergarten	455	3.7%
Elementary school	3,716	30.3%
High school	1,978	16.1%
College / grad school	5,311	43.3%

Employment

Industry of employment

Education & healthcare 31.9%

Manufacturing 11.5%

Professional & management 10.3%

Retail trade 9.5%

Arts, food & hospitality 9.1%

Finance & real estate 7.3%

Transportation & utilities 5.9%

Construction 5.1%

Other services 3.2%

Wholesale trade 3.1%

Public administration 1.5%

Information 1.3%

Agriculture & mining 0.1%

Occupation

Category	%
Management, business & arts	49.0%
Service	13.9%
Sales & office	21.8%
Natural resources & construction	4.5%
Production & transportation	10.9%

Employment type

Type	%
Private sector	87.3%
Government	8.8%
Self-employed	3.8%
Unpaid family workers	0.1%

Commute

Method	%
Drive alone	70.4%
Carpool	7.9%
Public transit	0.4%
Walk	3.7%
Work from home	16.8%
Other means	0.8%
Avg commute (minutes)	22.4

Poverty

All people 7.8%

Under 18 years 9.1%

18 and over 7.4%

Married-couple families 2.7%

Female-led households 12.0%

Income support

Source	% of households
Social Security	36.8%
Retirement income	29.5%
Supplemental Security	2.8%
Cash public assistance	2.7%
Food stamps / SNAP	7.9%

Health indicators

Condition	%
Obesity	31.7%
High blood pressure	31.8%
High cholesterol	33.5%
Diabetes	10.1%
Heart disease	6.7%
Stroke	2.9%
Asthma	9.9%
Arthritis	26.2%
Kidney disease	2.9%
Pulmonary disease	6.5%
Cancer	7.4%

Behavior / access	%
Smoking	14.9%
Binge drinking	17.5%
No physical activity	22.0%
Less than 7 hrs sleep	35.4%
Depression	20.8%
Fair or poor health	12.7%
Poor mental health	14.4%
Poor physical health	9.7%
No health insurance	9.8%
Visited doctor (checkup)	79.6%
Visited dentist	70.5%
Cholesterol screening	90.2%
Teeth loss	12.4%

Veterans & disability

Veterans	Count	%
Civilian veterans	2,356	6.3%

Disability	%
Any disability	10.5%
Under 18	4.9%
18–64 years	7.5%
65 and over	25.9%

Health insurance coverage

Type	%
Private insurance	76.1%
Public insurance	34.0%
No insurance	4.2%
Uninsured under 19	4.6%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	43,570	94.2%
Spanish	3,787	8.7%
Other Indo-European	1,938	4.4%
Asian & Pacific Islander	567	1.3%
Other languages	1,053	2.4%

Place of birth & citizenship

Origin	Count	%
Native born (US)	39,719	85.9%
Born in same state	38,319	82.8%
Born in different state	26,961	58.3%
Foreign born	1,400	3.0%
Naturalized citizen	6,540	14.1%
Not a US citizen	3,968	60.7%

Ancestry

Ancestry	Count	%
Italian	4,914	10.6%
French	2,395	5.2%
Arab	2,257	4.9%
Irish	679	1.5%
English	371	0.8%

Ancestry	Count	%
Norwegian	254	0.5%
Polish	97	0.2%
Dutch	43	0.1%
German	31	0.1%

Technology access

Metric	% of households
Computer access	37.9%
Internet access	93.4%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions about ZIP code 18104

What city is ZIP code 18104 in?

ZIP code 18104 is primarily assigned to Allentown, Pennsylvania.

What county is ZIP code 18104 in?

ZIP code 18104 falls within Lehigh County, Pennsylvania.

Does ZIP code 18104 have a large retiree population?

37% of households in ZIP code 18104 receive Social Security income, suggesting a significant retiree or disability population.

What is the population of ZIP code 18104?

ZIP code 18104 has an estimated population of 46,259 residents, with a density of 2,015 people per square mile.

What is the typical home value in ZIP code 18104?

The median home value in ZIP code 18104 is $280,800.

What is the median household income in ZIP code 18104?

The median household income in ZIP code 18104 is $83,861, above the national median of ~$75,000.

What timezone is ZIP code 18104 in?

ZIP code 18104 observes the EST timezone.