Seattle Open Data Standards, APIs & City Policy

Technology and Data Washington 3 Minutes Read · published February 07, 2026 Flag of Washington

Seattle, Washington maintains an open data program to publish city datasets, provide API access, and set metadata and licensing expectations for municipal data publishers and third-party developers. This guide summarizes the publication standards, technical API practices, governance roles, and compliance pathways used by the City of Seattle to manage open datasets and developer access.

Overview

The City publishes datasets through its official portal and expects standardized metadata, machine-readable formats, timely updates, and clear licensing. Datasets reside on the City of Seattle open data portal for discovery and API access via standard endpoints and developer tools. For the official portal see data.seattle.gov[1].

  • Metadata standard: include title, description, fields, update frequency, contact, and license.
  • Formats: provide CSV, GeoJSON, JSON, or other machine-readable exports when feasible.
  • Timeliness: indicate last updated date and frequency in metadata.
  • Licensing: clearly state an open license or permitted use terms in dataset metadata.
Check the portal metadata fields before publishing to ensure discoverability.

APIs, Access & Technical Standards

APIs generally follow common open-data endpoints and support RESTful queries, pagination, and filtering; many datasets expose Socrata-style or CKAN-compatible endpoints depending on the platform. Use stable resource identifiers, include schema details, and document query examples and rate limits where applicable.

  • API docs: publish endpoint examples and parameter descriptions in dataset documentation.
  • Schema: include field types, coordinate reference systems for spatial data, and sample records.
  • Security: avoid embedding sensitive or restricted personal data; follow privacy and public-records guidance.
  • Rate limits: document API throttling and recommended practices for bulk exports.

Penalties & Enforcement

The City of Seattle's published open data pages describe standards and governance but do not set out monetary penalties or fines on the portal pages themselves; specific enforcement mechanisms and fines are not specified on the cited page. For the official portal see data.seattle.gov[1].

  • Fines: not specified on the cited page.
  • Escalation: first, repeat, or continuing offence procedures are not specified on the cited page.
  • Non-monetary sanctions: orders to remove or redact datasets, restriction of publishing privileges, or referral to City legal review may be used; specifics are not specified on the cited page.
  • Enforcer and contact: Seattle Information Technology (Seattle IT) administers the open data program; for dataset issues consult the portal contact or Seattle IT channels available on the City site.

Appeals, review, and formal time limits for enforcement actions are not detailed on the portal pages; consult Seattle IT or the City Attorney for formal dispute and review procedures.

Applications & Forms

The City does not publish a universal paper form for dataset publication on the portal; dataset submission and API onboarding are typically handled through the portal UI or by contacting Seattle IT program staff. If a specific application form is required it will be listed on the dataset or program pages; no universal form name or fee is specified on the cited page.

Compliance & Best Practices

Publishers should remove or mask personal data when lawfully required, include provenance and update schedules, and provide clear contact points for corrections or takedowns. Maintain clear licensing and monitor dataset usage to detect misuse.

  • Maintenance: assign a dataset steward and publish update cadence in metadata.
  • Records: retain original schema and change logs to support audits.
  • Privacy review: run a privacy assessment before publishing datasets containing potentially identifiable information.
Coordinate with Seattle IT early to avoid republishing restricted records.

FAQ

Who runs Seattle's open data portal?
The City of Seattle operates its open data portal and program through Seattle IT and related departments; see the portal for contacts and dataset owners.
Is an API key required to use the datasets?
Many datasets are accessible without an API key for read queries; authenticated API keys may be used for higher rate limits or write access if supported by a dataset platform.
What license applies to city datasets?
Licensing is dataset-specific; each dataset should state its license in metadata—if no license is shown, check the dataset page or contact the dataset owner via the portal.

How-To

  1. Prepare your dataset: clean fields, choose machine-readable format, and create descriptive metadata including update frequency and contact.
  2. Create the dataset entry on the City portal or contact Seattle IT to request onboarding.
  3. Publish and document API endpoints and examples for developers, and include sample queries and expected response schemas.
  4. Monitor usage, respond to queries, and update metadata when the dataset changes.

Key Takeaways

  • Use standardized metadata and machine-readable formats to maximize dataset reuse.
  • Coordinate with Seattle IT for onboarding, privacy review, and API guidance.
  • Licensing and update frequency should be explicit on each dataset page.

Help and Support / Resources

  1. [1] City of Seattle Open Data Portal

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