ZIP Code Distance Calculator
How far apart two places are, the drive, the time difference, and the two compared side by side.
How far apart two places are, the drive, the time difference, and the two compared side by side.
In a straight line between the centers of the two ZIP Codes: 17 miles (27 km).
| Step | Instruction | Distance |
|---|
Census Bureau figures for each ZIP Code (American Community Survey, 2020–2024). Each comes with a margin of error, so a difference is named only when it is bigger than the two margins together.
| Measure | A Allentown | B Ferndale | Difference |
|---|---|---|---|
| City | Allentown, PA | Ferndale, PA | |
| County | Lehigh County | Bucks County | |
| Time zone | Eastern | Eastern | |
| Metro area | Allentown-Bethlehem-Easton, PA MSA | Philadelphia-Wilmington-Atlantic City, PA-NJ-DE-MD CMSA | |
| ZIP Code type | Standard | PO Box | |
| Area codes | 484, 610, 835 | 484, 610, 835 | |
| Land area | 0.3 sq mi | 0.4 sq mi | |
| Addresses that get mail | 3,633 | 72 | |
| People | 6,120 ±787 | 160 ±104 | Too uncertain to compare |
| Median age | 29.1 ±2.2 | 61.3 ±21.7 | Older in Ferndale |
| Median household income | $44,773 ±$8,210 | Not available | – |
| Per capita income | $28,551 ±$4,183 | $80,637 ±$35,050 | Higher in Ferndale |
| Poverty rate | 22.8% ±8.8 | 15.0% ±26.0 | Too uncertain to compare |
| Unemployment rate | 14.7% ±8.2 | 0.0% ±25.3 | Too uncertain to compare |
| Bachelor's degree or higher | 23.2% ±6.0 | 0.0% ±19.5 | Higher in Allentown |
| Homes lived in by owners | 8.3% ±4.7 | 100.0% ±30.5 | Too uncertain to compare |
| Median home value | $171,300 ±$59,814 | $404,400 ±$167,451 | Higher in Ferndale |
| Median rent | $1,430 ±$100 | Not available | – |
| Average commute | 28.8 min ±4.9 | Not available | – |
| People per household | 2.00 ±0.23 | 1.86 ±0.59 | No clear difference |
| Vacant homes | 7.5% ±4.0 | 0.0% ±30.5 | Too uncertain to compare |
| Households with broadband | 87.7% ±6.6 | 100.0% ±30.5 | No clear difference |
Dark bars: Allentown. Light bars: Ferndale. The thin lines are the margins of error: where they overlap, the two places may not really differ.
Largest age group: 20-34 in Allentown (43%), 65-74 in Ferndale (35%). The 20-34 group spans 15 years, so it looks bigger.
| Ages | Allentown | Ferndale |
|---|---|---|
| Under 10 | 9% ±3 | 0% ±26 |
| 10-19 | 12% ±4 | 7% ±22 |
| 20-34 | 43% ±8 | 17% ±28 |
| 35-44 | 14% ±5 | 0% ±18 |
| 45-54 | 10% ±3 | 24% ±25 |
| 55-64 | 7% ±2 | 6% ±20 |
| 65-74 | 4% ±2 | 35% ±14 |
| 75+ | 2% ±1 | 11% ±23 |
8% of occupied homes are owned in Allentown, 100% in Ferndale.
| Owners and renters | Allentown | Ferndale |
|---|---|---|
| Owned | 8% ±5 | 100% ±31 |
| Rented | 92% ±5 | 0% ±31 |
Most common: 20+ units in Allentown (46%), Single-family in Ferndale (90%).
| Kinds of homes | Allentown | Ferndale |
|---|---|---|
| Single-family | 4% ±4 | 90% ±17 |
| Townhouse | 12% ±5 | 0% ±31 |
| 2-4 units | 21% ±8 | 11% ±35 |
| 5-19 units | 17% ±9 | 0% ±43 |
| 20+ units | 46% ±8 | 0% ±31 |
| Mobile home | 0% ±1 | 0% ±31 |
| Boat, RV, van | 0% ±1 | 0% ±31 |
Most common in both: Drove alone (55% in Allentown, 52% in Ferndale).
| Getting to work | Allentown | Ferndale |
|---|---|---|
| Drove alone | 55% ±10 | 52% ±52 |
| Carpooled | 10% ±5 | 0% ±25 |
| Public transit | 9% ±4 | 0% ±25 |
| Walked | 10% ±6 | 0% ±25 |
| Other | 4% ±5 | 0% ±25 |
| Worked from home | 13% ±7 | 48% ±52 |
± is the Census Bureau's 90% margin of error. "Too uncertain" means one figure's margin is more than half of the figure itself. Census figures are for each ZIP Code's matching ZIP Code Tabulation Area; capped medians read "or more".
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Developer tools: Claude Code, Cursor, VS Code, CodexThe distance, the direction and both time zones above came from one call to the ZIP Codes API /v2/distance endpoint. Each place's facts and Census figures came from one /v2/zip call each, and the API has the same figures for any year from 2011 to 2024.
This comparison used 11 credits; a free key includes 2,500 a day.
curl -H "X-Api-Key: YOUR_KEY" "https://api.zip-codes.com/v2/distance?from=18101&to=18921"
The real /v2/distance response for this pair. Coordinates are rounded to 3 decimals here; the API returns full precision.
{
"success": true,
"request": {
"from": "18101",
"to": "18921"
},
"results": [
{
"success": true,
"input": {
"from": "18101",
"to": "18921"
},
"from": {
"country": "US",
"code": "18101",
"code_type": "ZIP",
"city": "Allentown",
"state": "PA",
"county": "Lehigh",
"location": {
"lat": 40.602,
"lon": -75.473
},
"timezone": {
"source": "timezone-boundary-builder",
"product": "Time zone boundaries (with oceans)",
"attribution": "Time zone boundaries \u00a9 OpenStreetMap contributors, timezone-boundary-builder (ODbL); time zone rules: IANA tz database",
"iana_name": "America/New_York",
"name": "Eastern",
"abbreviation": "EST",
"abbreviation_dst": "EDT",
"utc_offset": -5,
"utc_offset_dst": -4,
"observes_dst": true
},
"input_type": "code"
},
"to": {
"country": "US",
"code": "18921",
"code_type": "ZIP",
"city": "Ferndale",
"state": "PA",
"county": "Bucks",
"location": {
"lat": 40.521,
"lon": -75.166
},
"timezone": {
"source": "timezone-boundary-builder",
"product": "Time zone boundaries (with oceans)",
"attribution": "Time zone boundaries \u00a9 OpenStreetMap contributors, timezone-boundary-builder (ODbL); time zone rules: IANA tz database",
"iana_name": "America/New_York",
"name": "Eastern",
"abbreviation": "EST",
"abbreviation_dst": "EDT",
"utc_offset": -5,
"utc_offset_dst": -4,
"observes_dst": true
},
"input_type": "code"
},
"distance": {
"miles": 17.06,
"km": 27.46
},
"bearing": 109.1
}
],
"meta": {
"credits": {
"used": 1
}
}
}