18109 ZIP Code — Allentown, PA

Lehigh County, Pennsylvania

ZIP code 18109 is located in Allentown, Pennsylvania, within Lehigh County. It covers approximately 8.25 square miles and serves a population of 17,745 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 610/484.

About ZIP code 18109

The housing stock consists of a mix of housing types. Most homes were built in the pre-1940, giving the area an established character. Median home value is $166,400. Owner-occupancy sits near the national average at 50%.

Median household income is $53,540. Poverty affects 18% of residents, above the national average. SNAP benefit usage at 25% of households reflects economic stress in the area. 31% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is production, transportation, and material moving, with education and healthcare as the leading industry. The average commute of 22 minutes is near the national average.

College attainment at 16% is below the national average, consistent with a trades and production-oriented local economy.

Health indicators show elevated rates of smoking (22%) compared to national benchmarks.

Notable community characteristics include Spanish spoken in 23% of households.

Overall, ZIP code 18109 reflects a community defined by a trades-oriented workforce, economic challenges above the national average, a significant Social Security-dependent population, and elevated reliance on food assistance.

17,745

population

8.25

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

18109 ZIP code map

Cities in ZIP code 18109

Below are the cities the US Postal Service accepts for ZIP code 18109. Using any city not on this list may result in mail delivery delays.

City	Status
Allentown	Preferred

Nearby ZIP codes

18003 Lehigh Valley (0.1 mi) 18018 Bethlehem (2 mi) 18032 Catasauqua (2.2 mi) 18017 Bethlehem (2.5 mi) 18101 Allentown (3.1 mi) 18025 Bethlehem (3.2 mi) 18016 Bethlehem (3.3 mi) 18102 Allentown (3.5 mi) 18052 Whitehall (3.9 mi) 18015 Bethlehem (5.1 mi) 18103 Allentown (5.4 mi) 18020 Bethlehem (5.5 mi)

Demographics updated 05/2026

Population
Total population	17,745
Population density	2,151 / sq mi
State FIPS	42
County FIPS	077

Geography
Land area	8.25 sq mi
Water area	0.23 sq mi
Latitude	40.6418
Longitude	-75.4303
Timezone	Eastern (ET)
Area code	610/484

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	55.2%	37.9%	39.8%
$50k – $100k	32.4%	30.5%	30.8%
$100k – $200k	11.3%	24.2%	22.4%
Over $200k	1.1%	7.4%	7.1%

Demographics & statistics

17,745

Population

2,151

People per sq mi

35.1

Median age

$53,540

Median household income

$25,958

Per capita income

$166,400

Median home value

$1,260

Median monthly rent

50.2%

Home ownership

17.7%

Poverty rate

10.1%

Unemployment

3,998

Housing units

15.8%

Bachelor's or higher

Age distribution

Male Female

500

Under 5

570

518

5–9

590

464

10–14

529

632

15–19

719

600

20–24

684

1,422

25–34

1,619

1,087

35–44

1,238

956

45–54

1,089

437

55–59

497

464

60–64

529

711

65–74

809

360

75–84

409

146

85+

166

← Male

Female →

Age summary

Group	Count	%
Under 18	3,865	21.8%
18 and over	13,880	78.2%
65 and over	2,601	14.7%
Median age	35.1 years

Race & ethnicity

White 45.3%

Hispanic or Latino 20.7%

Other race 15.4%

Black or African American 9.2%

Two or more races 7.8%

Asian 1.5%

American Indian / Alaska Native 0.1%

Group	Count	%
White	10,126	45.3%
Hispanic or Latino	4,624	20.7%
Other race	3,443	15.4%
Black or African American	2,063	9.2%
Two or more races	1,754	7.8%
Asian	336	1.5%
American Indian / Alaska Native	23	0.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	55.2%	37.9%	39.8%
$50k – $100k	32.4%	30.5%	30.8%
$100k – $200k	11.3%	24.2%	22.4%
Over $200k	1.1%	7.4%	7.1%

Under $10k 5.3%

$10k–$15k 4.8%

$15k–$25k 11.8%

$25k–$35k 9.3%

$35k–$50k 15.5%

$50k–$75k 24.7%

$75k–$100k 8.2%

$100k–$150k 12.2%

$150k–$200k 6.2%

$200k+ 2.0%

Range	% of households
Under $10k	5.3%
$10k–$15k	4.8%
$15k–$25k	11.8%
$25k–$35k	9.3%
$35k–$50k	15.5%
$50k–$75k	24.7%
$75k–$100k	8.2%
$100k–$150k	12.2%
$150k–$200k	6.2%
$200k+	2.0%
Median income	$53,540

Housing

Home values

Under $50k 5.4%

$50k–$100k 7.3%

$100k–$150k 27.3%

$150k–$200k 30.2%

$200k–$300k 24.6%

$300k–$500k 3.0%

$500k–$1M 0.2%

$1M+ 2.0%

Housing overview

Metric	Value
Median home value	$166,400
Median rent / month	$1,260
Owner occupied	50.2%
Renter occupied	49.8%
Vacant	6.2%
Single-family detached	31.8%
Large apartment buildings	5.4%
Mobile homes	1.5%
Median rooms	5.4
Avg household size (owned)	2.43

Year built

Era	%
2020 or later	0.4%
2010–2019	4.0%
2000–2009	4.5%
1990–1999	4.0%
1980–1989	6.5%
1970–1979	14.4%
1960–1969	18.3%
1950–1959	14.1%
1940–1949	9.0%
1939 or earlier	24.7%

Bedrooms

Size	% of units
No bedroom (studio)	1.7%
1 bedroom	15.3%
2 bedrooms	25.8%
3 bedrooms	44.5%
4 bedrooms	9.3%
5+ bedrooms	3.5%

Vehicles per household

Vehicles	% of households
No vehicle	10.9%
1 vehicle	44.0%
2 vehicles	31.9%
3 or more	13.1%

Heating fuel

Fuel type	%
Utility gas	46.4%
Electricity	38.6%
Propane / LP gas	1.7%
Fuel oil	11.9%
Wood	0.2%
Solar	0.1%
No fuel used	0.3%

Households & families

Household type	Count	%
Married-couple family	2,415	34.3%
Cohabiting couple	481	6.8%
Male householder, no spouse	1,498	21.3%
Female householder, no spouse	2,653	37.6%
Households with children under 18	2,365	33.6%
Households with seniors (65+)	1,915	27.2%
Average household size	2.50

Marital status

Status	Male	Female
Never married	45.9%	43.2%
Married	41.2%	35.0%
Separated	2.1%	2.0%
Widowed	1.6%	10.0%
Divorced	9.1%	9.8%

Education

Less than 9th grade 5.2%

Some HS, no diploma 12.1%

HS graduate 39.7%

Some college, no degree 17.4%

Associate's degree 9.7%

Bachelor's degree 12.2%

Graduate / professional 3.6%

Metric	%
HS diploma or higher	82.7%
Bachelor's or higher	15.8%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	150	4.1%
Kindergarten	167	4.5%
Elementary school	1,756	47.5%
High school	944	25.5%
College / grad school	683	18.5%

Employment

Industry of employment

Education & healthcare 23.7%

Manufacturing 14.2%

Retail trade 13.2%

Arts, food & hospitality 11.5%

Transportation & utilities 10.4%

Professional & management 9.6%

Finance & real estate 4.3%

Other services 3.7%

Construction 3.3%

Public administration 2.4%

Wholesale trade 2.1%

Information 0.9%

Agriculture & mining 0.8%

Occupation

Category	%
Management, business & arts	25.5%
Service	21.8%
Sales & office	21.3%
Natural resources & construction	3.5%
Production & transportation	27.9%

Employment type

Type	%
Private sector	88.6%
Government	7.1%
Self-employed	3.9%
Unpaid family workers	0.3%

Commute

Method	%
Drive alone	76.5%
Carpool	11.4%
Public transit	5.2%
Walk	3.0%
Work from home	3.4%
Other means	0.6%
Avg commute (minutes)	22.1

Poverty

All people 17.7%

Under 18 years 32.2%

18 and over 13.7%

Married-couple families 8.8%

Female-led households 31.6%

Income support

Source	% of households
Social Security	30.7%
Retirement income	22.5%
Supplemental Security	6.8%
Cash public assistance	6.6%
Food stamps / SNAP	25.1%

Health indicators

Condition	%
Obesity	39.3%
High blood pressure	34.7%
High cholesterol	32.2%
Diabetes	13.5%
Heart disease	7.7%
Stroke	3.8%
Asthma	11.0%
Arthritis	27.3%
Kidney disease	3.5%
Pulmonary disease	8.7%
Cancer	6.2%

Behavior / access	%
Smoking	21.9%
Binge drinking	16.9%
No physical activity	31.9%
Less than 7 hrs sleep	40.2%
Depression	22.2%
Fair or poor health	20.8%
Poor mental health	17.1%
Poor physical health	13.6%
No health insurance	18.9%
Visited doctor (checkup)	78.3%
Visited dentist	56.5%
Cholesterol screening	87.1%
Teeth loss	21.3%

Veterans & disability

Veterans	Count	%
Civilian veterans	500	3.6%

Disability	%
Any disability	15.5%
Under 18	8.0%
18–64 years	14.9%
65 and over	29.5%

Health insurance coverage

Type	%
Private insurance	55.0%
Public insurance	47.3%
No insurance	8.2%
Uninsured under 19	1.3%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	16,675	94.0%
Spanish	3,806	22.8%
Other Indo-European	3,225	19.3%
Asian & Pacific Islander	111	0.7%
Other languages	46	0.3%

Place of birth & citizenship

Origin	Count	%
Native born (US)	14,081	79.4%
Born in same state	11,625	65.5%
Born in different state	8,220	46.3%
Foreign born	2,456	13.8%
Naturalized citizen	3,664	20.6%
Not a US citizen	2,322	63.4%

Ancestry

Ancestry	Count	%
Italian	788	4.4%
Arab	396	2.2%
French	287	1.6%
Irish	164	0.9%
English	108	0.6%

Ancestry	Count	%
Norwegian	29	0.2%
Polish	28	0.2%
German	14	0.1%
Dutch	12	0.1%

Technology access

Metric	% of households
Computer access	39.7%
Internet access	88.0%

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

Frequently asked questions about ZIP code 18109

What city is ZIP code 18109 in?

ZIP code 18109 is primarily assigned to Allentown, Pennsylvania.

What county is ZIP code 18109 in?

ZIP code 18109 falls within Lehigh County, Pennsylvania.

Is Spanish widely spoken in ZIP code 18109?

Approximately 23% of households in ZIP code 18109 speak Spanish as a primary language.

What is the poverty rate in ZIP code 18109?

18% of residents in ZIP code 18109 live below the poverty line, above the national average.

What is the typical home value in ZIP code 18109?

The median home value in ZIP code 18109 is $166,400.

What is the population of ZIP code 18109?

ZIP code 18109 has an estimated population of 17,745 residents, with a density of 2,151 people per square mile.

What timezone is ZIP code 18109 in?

ZIP code 18109 observes the EST timezone.