Zip Code 18104
Allentown, Pennsylvania — Lehigh County
📍 ZIP code 18104 is in Allentown, Lehigh County, Pennsylvania.
ZIP code 18104 is located in Allentown, Lehigh County, Pennsylvania. It is a zip code in the Eastern (EST/EDT) Time Zone with an estimated population of 47,999. The area code for ZIP code 18104 is 570.
Quick Answer
Zip code 18104 is in Allentown, Pennsylvania (Lehigh County). It has a population of 47,999, median household income of $94,279, and median home value of $296,800.
Population
47,999
Income
$94,279
Home Value
$296,800
Climate
86°F / 22°F
About Zip Code 18104
Zip code 18104 is located in Allentown, Pennsylvania, within Lehigh County. Home to approximately 47,999 residents, this area sits at an elevation of 457 ft and falls within the Eastern (EST/EDT) timezone. The local area code is 570.
The median household income is $94,279 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $296,800, and the cost of living index is 105 (5% above the national average of 100).
Summers average a high of 86°F while winters drop to 22°F. The area receives about 47 in of rain and 33 in of snow annually. The zip code covers 23.1 square miles of land area and 0.2 square miles of water.
Key Statistics
47,999
$94,279
$296,800
Eastern (EST/EDT)
570
457 ft
23.1 sq mi
39.3
18,686
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Compare With Nearby Zip Codes
| Metric | 18104 | 18106 | 18069 | 18102 | 18052 | 18101 |
|---|---|---|---|---|---|---|
| City | Allentown, PA | Allentown, PA | Orefield, PA | Allentown, PA | Whitehall, PA | Allentown, PA |
| Population | 47,999 | 6,437 | 8,804 | 51,315 | 29,271 | 5,789 |
| Median Income | $94,279 | $86,361 | $125,357 | $40,681 | $69,499 | $41,542 |
| Home Value | $296,800 | $361,200 | $407,200 | $146,600 | $247,100 | $153,800 |
| Cost of Living | 105 | 117 | 140 | 60 | 87 | 60 |
| Median Age | 39.3 | 48.4 | 45.7 | 30.8 | 39.6 | 30.3 |
Cost of Living
100 = National Average. Allentown's cost of living is 5% above the national average.
vs. State Avg
Above
Affordability
Moderate
Income-to-Home
3.1x
Demographics
Zip code 18104 has a population of 47,999 people with a median age of 39.3. There are 18,686 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Allentown (18104) population trend from 2010 to 2024
↓ -40.0%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
86°F
22°F
47 in
33 in
Allentown experiences warm summers with average highs around 86°F. Winters are cool with lows averaging 22°F. With 33 in of annual snowfall, residents should be prepared for significant winter weather.
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Housing & Economy
Median Home Value
$296,800
Median Household Income
$94,279
With 18,686 housing units across 23.1 square miles, 18104 has a housing density of 809 units per square mile. The home price-to-income ratio is 3.1x.
Location & Geography
Latitude
40.6117°
Longitude
-75.5469°
Land Area
23.1 sq mi
Water Area
0.2 sq mi
Nearby Zip Codes
Zip codes closest to 18104 (Allentown, PA) with distances:
All Zip Codes in Allentown, PA
Other zip codes serving Allentown:
ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 18104's $94,279. A way to compare Allentown to economically similar communities elsewhere in the country.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
ZIP Codes with Similar Demographics
The five U.S. ZIP codes whose racial and ethnic composition most closely matches 18104 (Allentown, PA). Similarity is measured by cosine distance on the five-category ACS demographic vector.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
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People Also Ask
What zip code is Allentown, Pennsylvania?
Allentown, Pennsylvania uses zip code 18104 along with 7 other zip codes.
What county is zip code 18104 in?
Zip code 18104 is located in Lehigh County, Pennsylvania.
What is the population of zip code 18104?
The population of zip code 18104 is 47,999 with a median age of 39.3.
Is 18104 in Allentown, Pennsylvania?
Yes, zip code 18104 is in Allentown, Lehigh County, Pennsylvania. The area code is 570.
Frequently Asked Questions
What city is zip code 18104 in?
Zip code 18104 is in Allentown, Pennsylvania. It is part of Lehigh County and uses the Eastern (EST/EDT) timezone.
What is zip code 18104?
Zip code 18104 is a U.S. postal code in Allentown, Pennsylvania (Lehigh County). It has a population of 47,999 and covers 23.1 square miles.
What is the population of zip code 18104?
The population of zip code 18104 (Allentown, PA) is 47,999 with a median age of 39.3. There are approximately 18,686 housing units in this area.
What is the median income in zip code 18104?
The median household income in zip code 18104 (Allentown, PA) is $94,279 per year. The cost of living index is 105 (100 = national average).
What is the average home price in zip code 18104?
The median home value in zip code 18104 (Allentown, PA) is $296,800. The cost of living index is 105 compared to the national average of 100.
What county is zip code 18104 in?
Zip code 18104 is located in Lehigh County, Pennsylvania. The primary city is Allentown.
What is the area code for zip code 18104?
Zip code 18104 in Allentown, PA uses area code 570. It is located in the Eastern (EST/EDT) timezone.
Is zip code 18104 a good place to live?
Zip code 18104 (Allentown, PA) has a cost of living index of 105 (100 = national average), a median household income of $94,279, and median home values of $296,800. The median age is 39.3. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 18104?
The cost of living index for zip code 18104 (Allentown, PA) is 105, where 100 represents the national average. This area is above the national average. Median home value: $296,800.
What schools serve zip code 18104?
Zip code 18104 in Allentown, Pennsylvania is served by the local school district of Lehigh County. For specific school information, check your state's department of education or GreatSchools.org.
All demographic data on this page is sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code boundary and delivery data is sourced from the United States Postal Service (USPS). Data is updated periodically and may not reflect the most current figures. Census Bureau ZIP Code Tabulation Areas (ZCTAs) may differ slightly from USPS ZIP code boundaries.
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Data Sources
- Population, income, housing, age, and demographics
- U.S. Census Bureau, American Community Survey 5-Year Estimates, 2019-2023 vintage.
- ZIP to city and county mapping
- USPS and HUD-USPS ZIP-County Crosswalk.
- Time zones and area codes
- IANA tz database and NANPA.
- Elevation
- U.S. Geological Survey National Elevation Dataset (NED), via the USGS Elevation Point Query Service. Mapped to each ZCTA centroid coordinates. Last refreshed 2026-05-19.
- Last refreshed
- 2026-05-18.