The zip code for Box Elder, SD is 57719, a single postal code serving this growing community on the eastern edge of Rapid City. Box Elder has transformed dramatically over the past two decades — the U.S.
Census Bureau's American Community Survey shows the population more than doubled between 2000 and 2020, driven largely by growth at Ellsworth Air Force Base and new housing developments. If you're mailing a package, filling out a job application, or setting up utility service, getting this five-digit code right matters more than you might think.
A wrong zip code can delay mail by days, trigger address verification failures, or even send your package to the wrong side of the state. Knowing the correct zip code for Box Elder SD is essential whether you're a new resident, a business owner, or just sending a card to family.
This guide covers the essential facts about Box Elder's postal geography, how to use the code correctly, and the common mistakes to avoid.
Why Box Elder Uses a Single Zip Code
Box Elder operates under one unified postal zone: 57719. This is common for smaller South Dakota municipalities, but Box Elder's rapid growth makes it an interesting case. The United States Postal Service (USPS) assigns zip codes based on delivery routes and population density, not city boundaries.
According to USPS addressing data, the 57719 zone covers approximately 40 square miles, including the city limits plus some unincorporated Pennington County areas nearby.
The single-code system means every residential and business address in Box Elder uses the same first five digits. The four-digit extension (ZIP+4) narrows it down to a specific block, building, or PO box. For example, addresses near Liberty Boulevard may carry a different +4 suffix than those along Box Elder Road.
That's why the zip code for Box Elder SD works a little differently than in larger metro areas where multiple codes split the city.
How to apply this: When filling out any online form, enter 57719 — the official zip code for Box Elder SD — in the zip code field and let the system auto-populate the city name. If the form asks for ZIP+4, check your mail piece or use the USPS ZIP Code Lookup tool to find your exact suffix.
Box Elder's Location Within the Rapid City Metro Area
Box Elder sits immediately northeast of Rapid City, and the zip code for Box Elder SD is entirely separate from Rapid City's multiple codes (57701, 57702, 57703). This separation matters for delivery logistics and address verification.
Ellsworth Air Force Base, the area's largest employer, falls under the 57719 code as well, though military mail sometimes uses a different internal routing system.
The Pennington County assessor's office reports that Box Elder's incorporated boundaries have expanded multiple times since 2010, annexing land for subdivisions like the Elks area and developments along Interstate 90.
Despite this growth, USPS has not split the code — a decision that keeps delivery routes efficient but occasionally confuses newcomers who expect multiple codes for a city of over 10,000 residents. Anyone moving to the area should confirm the zip code for Box Elder SD before updating their address with banks, insurers, and government agencies.
How to apply this: If you're using GPS navigation or an e-commerce checkout, select "Box Elder" as the city and 57719 as the code — do not substitute a Rapid City code, even if the map shows the areas touching.
How to Verify an Address in 57719
Address verification is the most practical reason people search for the zip code for Box Elder SD. Whether you're sending a package through a carrier, registering a vehicle, or applying for a loan, the address must match USPS records exactly. The Google Maps address lookup and USPS validation tools both draw from postal service data.
A common scenario: a new resident moves into a freshly built home in the South Valley subdivision. The street exists on county records, but USPS may not have added the delivery point to its database yet. The address verification fails, and the resident cannot complete an online order.
In that case, the fix is contacting the local Box Elder post office directly — they can confirm whether the address is active in their system and provide the correct ZIP+4.
How to apply this: Before shipping anything to a Box Elder address you haven't used before, run it through the USPS ZIP Code Lookup tool. If it doesn't validate, call the Box Elder Post Office at (605) 923-2824 to confirm the delivery point.
Zip Code 57719: Coverage and Boundaries
The 57719 postal zone doesn't follow city limit lines perfectly. According to USPS delivery statistics, the code covers the incorporated City of Box Elder plus portions of unincorporated Pennington County to the north and east.
This means some addresses with a "Box Elder" mailing address are actually outside city jurisdiction — they pay county taxes and vote in county elections, not city ones. For this reason, the zip code for Box Elder SD can cover addresses that fall under different local governments.
The table below breaks down what this means for practical purposes:
| Area Covered | City Limits? | Zip Code | Action to Take |
|---|---|---|---|
| Downtown Box Elder | Yes | 57719 | Use city services |
| Ellsworth AFB | Partial | 57719 | Check base mailroom rules |
| County land north of I-90 | No | 57719 | Verify jurisdiction before permits |
| Rapid City border areas | No | 57701-57703 | Use Rapid City code |
How to apply this: If you're buying property or starting a business, confirm whether the address is inside city limits by checking the Pennington County GIS map, not just the mailing address. Property within the 57719 zone may still be outside Box Elder's municipal boundaries.
Common Mistakes When Using the Box Elder Zip Code
People make predictable errors when handling the zip code for Box Elder SD. The most frequent mistake is confusing it with Rapid City codes, especially for addresses along the shared boundary near the Rushmore Crossing shopping area.
Another recurring issue involves the city name spelling — "Box Elder" is two words, and some systems auto-correct it to "Boxelder," which can trigger a mismatch warning.
The South Dakota Department of Revenue notes that sales tax filings sometimes list the wrong code for Box Elder businesses because the business's physical location and mailing address differ. A business on the edge of town might have a Box Elder street address but a Rapid City PO box, creating confusion about which code to use for official documents.
Getting the zip code for Box Elder SD right on the first try saves headaches for both residents and business owners alike.
How to apply this: Always use the physical address's code for property-related matters and the mailing address's code for correspondence. When in doubt, match the code to the street address, not the city name on your driver's license.
Frequently Asked Questions About zip code for box elder sd
What is the ZIP+4 for Box Elder addresses?
The ZIP+4 extension varies by block and building. For example, addresses on the 400 block of Box Elder Road West may carry a different +4 suffix than those on the 100 block. You can find your specific ZIP+4 by entering your full street address into the USPS ZIP Code Lookup tool.
The main five-digit code for the zip code for Box Elder SD remains 57719 regardless of the +4 extension.
Does Ellsworth Air Force Base use a different zip code?
Ellsworth AFB uses 57719 as its general mailing code, but on-base housing and unit addresses may have unique routing instructions. Military postal clerks sometimes recommend using the base's official address format, which includes the unit number and box number.
If you're sending mail to someone stationed at Ellsworth, ask them for their exact mailing format — the zip code for Box Elder SD is the same, but the internal routing differs.
Can I use a Rapid City zip code for a Box Elder address?
No. Using a Rapid City code for a Box Elder street address will cause delivery delays or failed address verification. The two cities have separate postal jurisdictions even where their boundaries touch. The zip code for Box Elder SD is 57719, and it should be paired with "Box Elder" as the city name in all address fields.
What if my new construction address doesn't validate?
New subdivisions sometimes take weeks or months to appear in USPS databases. If your address fails validation, contact the Box Elder Post Office directly. They can confirm whether your delivery point is active and provide the correct ZIP+4. Until then, you may need to use a PO box or general delivery for mail.
The zip code for Box Elder SD will still be 57719 for all addresses in the area.
Is Box Elder's zip code expected to change with future growth?
USPS periodically reviews delivery zones, but there are no announced plans to split 57719. Even if the city continues growing, the postal service tends to add new delivery routes within existing codes rather than create new ones.
The zip code for Box Elder SD should remain 57719 for the foreseeable future, though ZIP+4 suffixes will continue expanding as new streets are added.
Conclusion
- The zip code for Box Elder SD is 57719, serving the entire city plus portions of unincorporated Pennington County.
- Address verification matters — use the USPS lookup tool to confirm any address before shipping or filing official paperwork.
- Box Elder's code is separate from Rapid City's 57701-57703 codes, even along shared boundaries.
- ZIP+4 extensions vary by block and building, so always use the full nine-digit code when available.
Your next step is simple: bookmark the USPS ZIP Code Lookup tool and run any Box Elder address through it before you mail, ship, or register anything. Getting 57719 right takes seconds and prevents days of delay.
