Postal entity record
US 51003 Postal Code Data Source-backed
51003 postal code facts for Alton, US: region, coordinates, source, and nearby postal codes.
CountryUS
PlaceAlton
RegionIA
Nearby rows12
Key metadata
| Place | Alton |
|---|---|
| Admin area | Iowa / IA |
| Local area | Sioux |
| Coordinates | 42.9782, -96.0173 |
| GeoNames accuracy | 4 |
| Source | GeoNames postal code data |
| License | GeoNames postal data; provided as-is with attribution required. |
| Snapshot date | 2026-06-02 |
What this record means
This row links US 51003 to Alton, the available admin area, centroid coordinates, source accuracy, and source snapshot metadata.
Use it as a reference-data join for cleaning CRM rows, grouping operational reports, preparing territory QA, or checking whether an imported postal value has a source-backed match.
What the centroid can support
The latitude and longitude represent a postal centroid from the source snapshot. They are useful for approximate map previews, nearby-record review, deduplication checks, and distance-based QA.
They should not be treated as an official delivery boundary, address-level geocode, tax boundary, or service-area guarantee.
Sample CSV enrichment output
| Input field | Added output | Example value |
|---|---|---|
| postal_code | matched_place | Alton |
| postal_code | admin_area | Iowa |
| postal_code | centroid | 42.9782, -96.0173 |
Nearby postal codes
| Code | Place | Region | Distance |
|---|---|---|---|
| 51041 | Orange City | Iowa | 3.4 mi |
| 51022 | Granville | Iowa | 6.1 mi |
| 51036 | Maurice | Iowa | 7.6 mi |
| 51238 | Hospers | Iowa | 8.7 mi |
| 51250 | Sioux Center | Iowa | 10.9 mi |
| 51045 | Oyens | Iowa | 11.1 mi |
| 51050 | Remsen | Iowa | 11.7 mi |
| 51031 | Le Mars | Iowa | 14.8 mi |
| 51035 | Marcus | Iowa | 15.4 mi |
| 51027 | Ireton | Iowa | 15.5 mi |
| 51046 | Paullina | Iowa | 15.6 mi |
| 51234 | Boyden | Iowa | 15.7 mi |