21003

21003 is a numeric designation used in several unrelated contexts. As a result, its meaning depends on the domain in which it appears. In postal and geographic contexts, 21003 is used as a United States ZIP code. ZIP codes in this range are assigned by the U.S. Postal Service for mail delivery and generally cover suburban or residential areas within a metropolitan region. Boundaries and the associated local services or demographics are described by postal, census, and local government records.

In astronomy, 21003 denotes a specific minor planet (asteroid) that has been numbered by the Minor Planet Center. The number indicates its place in the sequence of officially cataloged bodies, not a date or size. Information about the asteroid’s orbit, size estimates, and naming status is maintained in astronomical databases such as the JPL Small-Body Database and the Minor Planet Center.

Beyond these areas, 21003 can also occur as a model or catalog number in manufacturing, logistics, or product documentation. Such numeric identifiers are common for parts, devices, or internal tracking codes within organizations. They typically carry no inherent meaning outside the system that assigns them and gain context from accompanying documentation or metadata.

Because 21003 spans multiple domains, identifying its precise meaning requires context. Without additional information, it may refer to a ZIP code, a numbered asteroid, or a catalog or model identifier in a given industry.