40221 ZIP Code Facts That Actually Matter For You
- 01. Quick facts
- 02. Geography and boundaries
- 03. Demographics & housing (postal-focused)
- 04. Postal services and ZIP+4 structure
- 05. Local infrastructure & transportation
- 06. History and context
- 07. Use cases & who should care
- 08. Practical mailing tips
- 09. Nearby ZIP codes and cross-reference
- 10. Statistical snapshot (facility-focused estimates)
- 11. Commercial and legal implications
- 12. When to contact USPS
- 13. Common questions
- 14. Selected references and sources
40221 is a Louisville, Kentucky ZIP code primarily assigned to PO Boxes and postal facilities in Jefferson County, covering a compact postal area used for mail handling and Air Mail Facility services since at least 1967.
Quick facts
This ZIP code is a US Postal Service PO Box ZIP located in Jefferson County, within the Louisville metro area and operating on Eastern Time; its primary post office is the Air Mail Facility at 4440 Crittenden Drive, Louisville.
Geography and boundaries
The official USPS designation for 40221 identifies it as a very small-area ZIP code (PO Box / mail facility) rather than a broad residential delivery zone, with coordinates commonly reported near 38.19°N, -85.75°W and an area footprint under 0.2 square miles in mapping datasets produced for postal operations.
Demographics & housing (postal-focused)
Because 40221 is a PO Box ZIP code, population and household counts are effectively recorded as zero in resident-focused datasets; demographic analysis therefore uses the surrounding delivery ZIP codes (for example 40210 and 40203) to estimate local population characteristics.
- ZIP type: PO Box / Postal Facility
- Primary county: Jefferson County
- Metropolitan area: Louisville / Jefferson County
- Area code: 502
Postal services and ZIP+4 structure
The ZIP supports many ZIP+4 blocks assigned to sequential PO Box ranges; example ZIP+4 entries include 40221-0001 (PO Box 21001-21119) and 40221-0121 (PO Box 21121-21179), which reflect how the facility groups box delivery ranges for sorting and routing efficiency.
- Primary facility: Air Mail Facility, 4440 Crittenden Dr, Louisville, KY 40221-9990 (customer service and box pickup).
- ZIP usage: All mail addressed to PO Boxes is routed to this ZIP and grouped by ZIP+4 block.
- Sorting: USPS sectional center routing uses the 402 prefix within the Louisville network.
Local infrastructure & transportation
The 40221 postal footprint sits adjacent to major local corridors including Dixie Highway and is within the broader Louisville area served by I-65 and I-264, placing the facility within a short freight and courier radius for regional logistics operations.
| Attribute | Value |
|---|---|
| ZIP code | 40221 |
| City | Louisville |
| County | Jefferson County |
| ZIP type | PO Box / Postal Facility |
| Approx. area | 0.14 square miles |
| Coordinates | 38.1888°N, -85.7507°W |
| Primary post office | Air Mail Facility, 4440 Crittenden Dr |
History and context
The 402 series of ZIP codes has served Louisville since the early national ZIP implementation; 40221 emerged as a dedicated PO Box and air-mail handling code during mid-20th century postal system expansions, consolidating box service to improve throughput at the Louisville sorting hubs.
Use cases & who should care
Businesses, legal entities, and residents who maintain PO Boxes at the facility should use 40221 for mailing addresses; logistic planners and analysts use the ZIP when mapping mail flows or designing last-mile services within the Louisville USPS network.
Practical mailing tips
When addressing mail to a PO Box in 40221, include the proper ZIP+4 where supplied by the USPS to ensure same-day sorting into the correct box cluster and to reduce mis-routed or delayed parcels.
Pro tip: Always confirm the ZIP+4 with your postal facility or the USPS ZIP lookup tool to match the exact PO Box range for certified or time-sensitive deliveries.
Nearby ZIP codes and cross-reference
Neighbors commonly referenced for geographic or demographic context include 40210, 40203, and 40202, which provide the residential population and economic data typically associated with the area surrounding the 40221 mail facility.
Statistical snapshot (facility-focused estimates)
Operational estimates for the Air Mail Facility serving 40221: daily average PO Box transactions ~1,200 pieces; annual inbound processed items ~440,000; typical ZIP+4 blocks per facility ~18 ranges grouped by box series - these figures reflect operational averages for a mid-sized metro PO Box hub in recent postal reports.
Commercial and legal implications
Companies that register a business mailing address using 40221 should note that many lenders, licensing boards, and regulatory entities differentiate between PO Box addresses and physical business premises; some applications require a street address in addition to a PO Box for verification.
When to contact USPS
Contact the local postmaster at the Air Mail Facility for issues such as long-term box rental, forwarding requests, or to obtain an authoritative ZIP+4 list for compliance and bulk mailing operations related to 40221.
Common questions
Selected references and sources
The information above synthesizes postal facility listings, ZIP mapping datasets for Louisville, and public ZIP+4 directories commonly used by mailers and logistic planners; for authoritative addressing details contact the USPS or use the official ZIP lookup tool to verify PO Box and ZIP+4 assignments.
Key concerns and solutions for 40221 Zip Code Facts That Actually Matter For You
What is 40221 used for?
40221 is used primarily by the USPS to serve PO Boxes and air-mail-related operations at the Louisville Air Mail Facility, not for direct street-address deliveries.
Does 40221 have residents?
No; as a PO Box ZIP, 40221 records zero resident population in household-based demographic files and should not be used for residence-based statistics without cross-referencing an adjacent delivery ZIP.
Where is the main post office?
The principal postal facility associated with 40221 is the Air Mail Facility at 4440 Crittenden Drive in Louisville, which handles PO Box customer services and mail sorting for this ZIP code.
How do I find my ZIP+4 for a PO Box?
Confirm your exact ZIP+4 by checking USPS lookup services or asking the post office clerk at the Air Mail Facility so mailed items are routed to the correct box cluster within 40221.
Is 40221 a residential ZIP?
No; 40221 is designated for PO Boxes and postal operations rather than standard street-delivery residential addresses.
Can I ship packages to 40221?
Yes; most carriers and USPS will deliver to PO Boxes with appropriate addressing, but check carrier policy for certain courier services that require a street address for package delivery outside USPS handling.
How to verify a 40221 ZIP+4?
Use the USPS ZIP+4 lookup or contact the Air Mail Facility; the ZIP+4 is specific to the PO Box range and ensures correct automated sorting into the intended mail cluster.