Zip Code 18020
Allentown, Pennsylvania — Northampton County
📍 ZIP code 18020 is in Allentown, Northampton County, Pennsylvania.
ZIP code 18020 is located in Allentown, Northampton County, Pennsylvania. It is a zip code in the Eastern (EST/EDT) Time Zone with an estimated population of 21,144. The area code for ZIP code 18020 is 570.
Quick Answer
Zip code 18020 is in Allentown, Pennsylvania (Northampton County). It has a population of 21,144, median household income of $122,610, and median home value of $348,900.
Population
21,144
Income
$122,610
Home Value
$348,900
Climate
86°F / 22°F
About Zip Code 18020
Zip code 18020 is located in Allentown, Pennsylvania, within Northampton County. Home to approximately 21,144 residents, this area sits at an elevation of 384 ft and falls within the Eastern (EST/EDT) timezone. The local area code is 570.
The median household income is $122,610 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $348,900, and the cost of living index is 133 (33% 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 13.8 square miles of land area and 0.2 square miles of water.
Key Statistics
21,144
$122,610
$348,900
Eastern (EST/EDT)
570
384 ft
13.8 sq mi
42.3
7,940
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Compare With Nearby Zip Codes
| Metric | 18020 | 18045 | 18017 | 18018 | 18042 | 18055 |
|---|---|---|---|---|---|---|
| City | Allentown, PA | Easton, PA | Allentown, PA | Bethlehem, PA | Easton, PA | Hellertown, PA |
| Population | 21,144 | 29,896 | 40,463 | 32,253 | 44,797 | 11,947 |
| Median Income | $122,610 | $109,068 | $88,946 | $71,968 | $75,806 | $90,087 |
| Home Value | $348,900 | $301,300 | $310,600 | $224,000 | $205,900 | $293,800 |
| Cost of Living | 133 | 116 | 106 | 81 | 76 | 100 |
| Median Age | 42.3 | 45.2 | 44.7 | 39.5 | 36.4 | 46.7 |
Cost of Living
100 = National Average. Allentown's cost of living is 33% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
2.8x
Demographics
Zip code 18020 has a population of 21,144 people with a median age of 42.3. There are 7,940 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Allentown (18020) population trend from 2010 to 2024
↓ -3.1%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
$348,900
Median Household Income
$122,610
With 7,940 housing units across 13.8 square miles, 18020 has a housing density of 575 units per square mile. The home price-to-income ratio is 2.8x.
Location & Geography
Latitude
40.6724°
Longitude
-75.3275°
Land Area
13.8 sq mi
Water Area
0.2 sq mi
Nearby Zip Codes
Zip codes closest to 18020 (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 18020's $122,610. 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 18020 (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 18020 along with 7 other zip codes.
What county is zip code 18020 in?
Zip code 18020 is located in Northampton County, Pennsylvania.
What is the population of zip code 18020?
The population of zip code 18020 is 21,144 with a median age of 42.3.
Is 18020 in Allentown, Pennsylvania?
Yes, zip code 18020 is in Allentown, Northampton County, Pennsylvania. The area code is 570.
Frequently Asked Questions
What city is zip code 18020 in?
Zip code 18020 is in Allentown, Pennsylvania. It is part of Northampton County and uses the Eastern (EST/EDT) timezone.
What is zip code 18020?
Zip code 18020 is a U.S. postal code in Allentown, Pennsylvania (Northampton County). It has a population of 21,144 and covers 13.8 square miles.
What is the population of zip code 18020?
The population of zip code 18020 (Allentown, PA) is 21,144 with a median age of 42.3. There are approximately 7,940 housing units in this area.
What is the median income in zip code 18020?
The median household income in zip code 18020 (Allentown, PA) is $122,610 per year. The cost of living index is 133 (100 = national average).
What is the average home price in zip code 18020?
The median home value in zip code 18020 (Allentown, PA) is $348,900. The cost of living index is 133 compared to the national average of 100.
What county is zip code 18020 in?
Zip code 18020 is located in Northampton County, Pennsylvania. The primary city is Allentown.
What is the area code for zip code 18020?
Zip code 18020 in Allentown, PA uses area code 570. It is located in the Eastern (EST/EDT) timezone.
Is zip code 18020 a good place to live?
Zip code 18020 (Allentown, PA) has a cost of living index of 133 (100 = national average), a median household income of $122,610, and median home values of $348,900. The median age is 42.3. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 18020?
The cost of living index for zip code 18020 (Allentown, PA) is 133, where 100 represents the national average. This area is above the national average. Median home value: $348,900.
What schools serve zip code 18020?
Zip code 18020 in Allentown, Pennsylvania is served by the local school district of Northampton 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.