In the United States, a zip code is 5 digits, but it can be extended to 9 digits (ZIP+4) for more precision. "15743" is a valid 5-digit ZIP for Hillsdale, Pennsylvania , and "8" could be the start of its +4 extension. 3. Industrial or Technical Part Number
While most people think of the 5-digit US ZIP code, other countries use different formats: 157438 zip
Some regulatory filings (like those found on the SEC.gov Archives ) use long numerical strings to index specific reports. 2. Regional Postal Code Systems In the United States, a zip code is