Pierce County Zip Code Geographic Boundaries

Zip code polygons for Pierce County, Washington, adjusted from the Zip+4 Address Information System to align with parcel locations. The dataset is maintained by Pierce County GIS and was last updated in March 2026. Users are advised to cross-reference with the USPS for current address changes.

Use Cases

• Spatial join of ZIP_CODE or ZIPCODE_TXT with other county datasets for demographic analysis.
• Calculate Shape__Area or Shape__Length of zip code zones for resource allocation planning.
• Validate parcel addresses against the TYPE and FULLNAME fields for mailing logistics.
• Visualize administrative boundaries using the_geom column for mapping applications.

Strengths

• Contains nine columns including geometry and multiple zip code identifiers.
• Polygons were adjusted to ensure parcels fall within correct zip codes, improving spatial accuracy.

Limitations

• Row count and temporal coverage are unknown, limiting assessment of completeness.
• Requires cross-referencing with USPS for current street changes, indicating potential staleness.

Provenance

Source

Pierce County GIS, derived from the Zip+4 Address Information System.

Collection Method

Acquired from Zip+4 system and adjusted for parcel alignment.

Freshness

Last updated March 2026.

Geography

Pierce County, Washington, USA.