Northfield, KY ZIP Codes
One ZIP code serves Northfield, Kentucky: 40222. Together they are home to 21,470 residents in 10,047 households. That is more than the 1,250 people counted inside Northfield city limits, because these ZIP codes reach past its boundary.
Northfield city limits (Census)
| Measure | Census figure |
|---|---|
| Residents | 1,250 |
| Households | 528 |
| Median household income | $111,250 |
| Median home value | $513,300 |
| Median age | 46.6 |
| Median rent | $1,659 |
All 1 ZIP codes together
| Measure | Value |
|---|---|
| Residents (sum of ZIP codes) | 21,470 |
| Households (sum of ZIP codes) | 10,047 |
| Median household income, range across ZIP codes | $82,511 (40222) to $82,511 (40222) |
| Household-weighted average of ZIP medians (an approximation, not a true median) | $82,511 |
| Homeowners | 55.1% |
| Households with kids under 18 | 20.9% |
| Moved in the past year | 15.2% |
| Carrier routes in EDDM2GO's route library | 25 routes, 11,627 homes (1 of 1 ZIP codes) |
Every ZIP code in Northfield
| ZIP | Mailing city | Residents | Households | Median income | Home value | Homeowners | With kids | New movers | Carrier routes | Mailboxes | Why listed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 40222 | Louisville | 21,470 | 10,047 | $82,511 | $363,000 | 55.1% | 20.9% | 15.2% | 25 | 12,829 | 5% of its land |
A ZIP code is listed for Northfield when at least 10% of its land lies inside Northfield city limits, when it holds at least 10% of the place's land, or when its USPS mailing city is Northfield. The table shows which applies. Totals add up whole ZIP codes, so they include any parts outside Northfield.
Counties
- Jefferson County — 39 ZIP codes
Nearby cities sharing these ZIP codes
- Louisville/Jefferson County metro government (balance) — 23 ZIP codes
- St. Matthews — 2 ZIP codes
- Lyndon — 3 ZIP codes
Price a mailing to Northfield ZIP codes
EDDM guides
Pick carrier routes on the EDDM route map
Frequently asked questions
- What ZIP codes are in Northfield, KY?
- 40222. A ZIP code is listed for Northfield when at least 10% of its land lies inside Northfield city limits, when it holds at least 10% of the place's land, or when its USPS mailing city is Northfield.
- What is the population of Northfield, KY?
- The Census Bureau counts 1,250 residents inside Northfield city limits (ACS 2020–2024). The 1 ZIP code that serve Northfield hold 21,470 residents in all.
- What is the median household income in Northfield, KY?
- $111,250 inside Northfield city limits, per the Census Bureau. Across its ZIP codes the medians run from $82,511 to $82,511.
- How many carrier routes and mailboxes are in Northfield, KY?
- For the 1 of 1 ZIP codes in EDDM2GO's stored route library: 25 carrier routes reaching 11,627 residential and 1,204 business mailboxes.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.